Common Weakness Enumeration
CWE-295
AllowedImproper Certificate Validation
Abstraction: Base · Status: Draft
The product does not validate, or incorrectly validates, a certificate.
2254 vulnerabilities reference this CWE, most recent first.
CVE-2026-63650 (GCVE-0-2026-63650)
Vulnerability from cvelistv5 – Published: 2026-08-14 22:13 – Updated: 2026-08-17 15:38
VLAI
EPSS
VEX
Summary
OpenVPN 2.7_alpha1 through 2.7.5 using mbedTLS allows remote authenticated users to be misidentified by ignoring the configured X.509 username identity lookup field
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-17 15:22 UTC
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://community.openvpn.net/Security%20Announce… | vendor-advisory |
| https://community.openvpn.net/ReleaseHistory#open… | release-notes |
Impacted products
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CVE-2026-63577 (GCVE-0-2026-63577)
Vulnerability from cvelistv5 – Published: 2026-10-02 07:07 – Updated: 2026-10-06 19:31
VLAI
EPSS
VEX
Title
Name Constraints bypass: directoryName constraint matched at any position in the DN instead of as a prefix
Summary
Improper certificate validation in the directoryName name-constraint check (PkixNameConstraintValidator.WithinDNSubtree) in Legion of the Bouncy Castle Inc. bc-csharp before 2.7.0 allows an attacker who controls, or can have certificates issued by, a name-constrained intermediate CA to get certificates accepted by PKIX path validation whose subject distinguished name, or a directoryName subjectAltName, lies outside the CA's permitted subtrees, via a name that places other RDNs ahead of a copy of the permitted RDN sequence, because the check looks for the constraint's first RDN anywhere in the name and compares the remaining RDNs from that position, instead of requiring the constraint to be an initial prefix of the name as RFC 5280 sections 4.2.1.10 and 7.1 require.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-06 19:21 UTC
CWE
- CWE-295 - Improper Certificate Validation
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/bcgit/bc-csharp/wiki/CVE-2026-63577 | vendor-advisory |
| https://github.com/bcgit/bc-csharp/commit/606e915… | patch |
| https://github.com/bcgit/bc-csharp/commit/75c3c57… | patch |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Legion of the Bouncy Castle Inc. | bc-csharp |
Affected:
0 , < 2.7.0
(semver)
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CVE-2026-63576 (GCVE-0-2026-63576)
Vulnerability from cvelistv5 – Published: 2026-10-02 07:07 – Updated: 2026-10-06 19:31
VLAI
EPSS
VEX
Title
URI name constraints checked against a mis-parsed host
Summary
Improper certificate validation in PkixNameConstraintValidator (ExtractHostFromURL) in Legion of the Bouncy Castle Inc. bc-csharp before 2.7.0 allows a name-constrained subordinate CA, or anyone able to obtain certificates with chosen subjectAltName URIs from such a CA, to bypass permitted or excluded uniformResourceIdentifier name constraints during certification path validation via a URI whose path, query, fragment or userinfo contains characters such as '@' or ':', because the host was extracted by string slicing without first isolating the RFC 3986 authority component, so the host compared against the constraints could differ from the URI's actual host.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-06 19:21 UTC
CWE
- CWE-295 - Improper Certificate Validation
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/bcgit/bc-csharp/wiki/CVE-2026-63576 | vendor-advisory |
| https://github.com/bcgit/bc-csharp/commit/f196a22… | patch |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Legion of the Bouncy Castle Inc. | bc-csharp |
Affected:
0 , < 2.7.0
(semver)
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CVE-2026-63374 (GCVE-0-2026-63374)
Vulnerability from cvelistv5 – Published: 2026-09-22 15:23 – Updated: 2026-09-28 16:32
VLAI
EPSS
VEX
Title
AnyIO: TLSStream IDNA 2003 host name encoding enables potential TLS certificate spoofing
Summary
AnyIO is a high level asynchronous concurrency and networking framework that works on top of either Trio or asyncio. Prior to 4.14.2, connect_tcp() and TLSStream.wrap() can validate internationalized host names after the standard library converts them with IDNA 2003 instead of IDNA 2008. When a connection to a non-ASCII domain is hijacked or redirected, an attacker can obtain a legitimate certificate for the different ASCII hostname produced by IDNA 2003 and present it to the client, causing the malicious endpoint's certificate to validate. This issue is fixed in version 4.14.2.
Severity
SSVC
Exploitation: none
Automatable: yes
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-28 16:07 UTC
CWE
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/agronholm/anyio/security/advis… | x_refsource_CONFIRM |
| https://github.com/agronholm/anyio/pull/1208 | x_refsource_MISC |
| https://github.com/agronholm/anyio/commit/68f5891… | x_refsource_MISC |
| https://github.com/agronholm/anyio/releases/tag/4.14.2 | x_refsource_MISC |
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CVE-2026-63336 (GCVE-0-2026-63336)
Vulnerability from cvelistv5 – Published: 2026-08-18 16:29 – Updated: 2026-08-18 17:34
VLAI
EPSS
VEX
Title
RabbitMQ Java client: TrustEverythingTrustManager used by default in useSslProtocol() enables MITM
Summary
The RabbitMQ Java client library allows Java and JVM-based applications to connect to and interact with RabbitMQ nodes. Prior to 5.33.0, com.rabbitmq.client.ConnectionFactory.useSslProtocol() and ConnectionFactory.useSslProtocol(String) configure com.rabbitmq.client.TrustEverythingTrustManager and leave hostname verification disabled, causing arbitrary server certificates, including self-signed certificates, to be accepted. A network attacker able to intercept a TLS connection can impersonate the RabbitMQ broker, read protected AMQP traffic, and modify traffic without certificate or hostname validation. The fix changes the production TLS helpers to use the JVM default trust store and enables hostname verification, while retaining an explicitly named development-only no-verification helper. This issue is fixed in version 5.33.0.
Severity
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-18 17:30 UTC
CWE
- CWE-295 - Improper Certificate Validation
Assigner
References
6 references
| URL | Tags |
|---|---|
| https://github.com/rabbitmq/rabbitmq-java-client/… | x_refsource_CONFIRM |
| https://github.com/rabbitmq/rabbitmq-java-client/… | x_refsource_MISC |
| https://github.com/rabbitmq/rabbitmq-java-client/… | x_refsource_MISC |
| https://github.com/rabbitmq/rabbitmq-java-client/… | x_refsource_MISC |
| https://github.com/rabbitmq/rabbitmq-java-client/… | x_refsource_MISC |
| https://github.com/rabbitmq/rabbitmq-java-client/… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| rabbitmq | rabbitmq-java-client |
Affected:
< 5.33.0
|
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CVE-2026-61668 (GCVE-0-2026-61668)
Vulnerability from cvelistv5 – Published: 2026-09-15 17:29 – Updated: 2026-09-17 16:33
VLAI
EPSS
VEX
Title
DIRAC: Pilot code downloaded over unverified HTTPS connection
Summary
DIRAC is an interware, meaning a software framework for distributed computing. Prior to versions 8.0.79, 9.0.22, and 9.1.10, WorkloadManagementSystem/Utilities/PilotWrapper.py pilotWrapperScript uses ssl._create_unverified_context to download the second-stage pilot.tar archive without TLS certificate verification and downloads the reference checksum through the same unvalidated channel. An attacker able to redirect or intercept a grid site's network traffic through DNS or routing manipulation can substitute both the executable pilot code and its checksum, causing arbitrary code to run in the pilot context with access to pilot proxy credentials. The fixed implementation validates the server certificate through system trust and X509_CERT_DIR or the grid certificate directory. This issue is fixed in versions 8.0.79, 9.0.22, and 9.1.10.
Severity
8.1 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-17 16:33 UTC
CWE
- CWE-295 - Improper Certificate Validation
Assigner
References
7 references
| URL | Tags |
|---|---|
| https://github.com/DIRACGrid/DIRAC/security/advis… | x_refsource_CONFIRM |
| https://github.com/DIRACGrid/DIRAC/commit/68029df… | x_refsource_MISC |
| https://github.com/DIRACGrid/DIRAC/commit/92e2e26… | x_refsource_MISC |
| https://github.com/DIRACGrid/DIRAC/commit/b332c43… | x_refsource_MISC |
| https://github.com/DIRACGrid/DIRAC/releases/tag/v8.0.79 | x_refsource_MISC |
| https://github.com/DIRACGrid/DIRAC/releases/tag/v9.0.22 | x_refsource_MISC |
| https://github.com/DIRACGrid/DIRAC/releases/tag/v9.1.10 | x_refsource_MISC |
Impacted products
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CVE-2026-59836 (GCVE-0-2026-59836)
Vulnerability from cvelistv5 – Published: 2026-07-14 15:15 – Updated: 2026-07-15 03:59
VLAI
EPSS
VEX
Summary
A improper certificate validation vulnerability in Fortinet FortiClientEMS 7.4.3 through 7.4.5, FortiClientEMS 7.4.0 through 7.4.1, FortiClientEMS 7.2 all versions may allow attacker to information disclosure via <insert attack vector here>
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-14 00:00 UTC
CWE
- CWE-295 - Information disclosure
Assigner
References
1 reference
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Fortinet | FortiClientEMS |
Affected:
7.4.3 , ≤ 7.4.5
(semver)
Affected: 7.4.0 , ≤ 7.4.1 (semver) Affected: 7.2.12 , ≤ 7.2.14 (semver) Affected: 7.2.0 , ≤ 7.2.10 (semver) cpe:2.3:a:fortinet:forticlientems:7.4.5:*:*:*:*:*:*:* cpe:2.3:a:fortinet:forticlientems:7.4.4:*:*:*:*:*:*:* cpe:2.3:a:fortinet:forticlientems:7.4.3:*:*:*:*:*:*:* cpe:2.3:a:fortinet:forticlientems:7.4.1:*:*:*:*:*:*:* cpe:2.3:a:fortinet:forticlientems:7.4.0:*:*:*:*:*:*:* cpe:2.3:a:fortinet:forticlientems:7.2.14:*:*:*:*:*:*:* cpe:2.3:a:fortinet:forticlientems:7.2.13:*:*:*:*:*:*:* cpe:2.3:a:fortinet:forticlientems:7.2.12:*:*:*:*:*:*:* cpe:2.3:a:fortinet:forticlientems:7.2.10:*:*:*:*:*:*:* cpe:2.3:a:fortinet:forticlientems:7.2.9:*:*:*:*:*:*:* cpe:2.3:a:fortinet:forticlientems:7.2.8:*:*:*:*:*:*:* cpe:2.3:a:fortinet:forticlientems:7.2.7:*:*:*:*:*:*:* cpe:2.3:a:fortinet:forticlientems:7.2.6:*:*:*:*:*:*:* cpe:2.3:a:fortinet:forticlientems:7.2.5:*:*:*:*:*:*:* cpe:2.3:a:fortinet:forticlientems:7.2.4:*:*:*:*:*:*:* cpe:2.3:a:fortinet:forticlientems:7.2.3:*:*:*:*:*:*:* cpe:2.3:a:fortinet:forticlientems:7.2.2:*:*:*:*:*:*:* cpe:2.3:a:fortinet:forticlientems:7.2.1:*:*:*:*:*:*:* cpe:2.3:a:fortinet:forticlientems:7.2.0:*:*:*:*:*:*:* |
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CVE-2026-59825 (GCVE-0-2026-59825)
Vulnerability from cvelistv5 – Published: 2026-08-18 15:07 – Updated: 2026-08-18 15:51
VLAI
EPSS
VEX
Title
Mastodon: Unwanted deactivation of SSL/TLS certificate verification
Summary
Mastodon is a free, open-source social network server based on ActivityPub. Prior to 4.4.19 and from 4.5.0 until 4.5.12, Mastodon's app/models/concerns/user/ldap_authenticable.rb mutates OpenSSL::SSL::SSLContext::DEFAULT_PARAMS when LDAP authentication uses LDAP_TLS_NO_VERIFY=true, disabling SSL and TLS certificate verification globally for requests made by puma web processes while sidekiq background jobs remain unaffected. This issue is fixed in versions 4.4.19 and 4.5.12.
Severity
7.4 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-18 15:51 UTC
CWE
- CWE-295 - Improper Certificate Validation
Assigner
References
7 references
| URL | Tags |
|---|---|
| https://github.com/mastodon/mastodon/security/adv… | x_refsource_CONFIRM |
| https://github.com/mastodon/mastodon/pull/39571 | x_refsource_MISC |
| https://github.com/mastodon/mastodon/commit/2ccb6… | x_refsource_MISC |
| https://github.com/mastodon/mastodon/commit/5748d… | x_refsource_MISC |
| https://github.com/mastodon/mastodon/commit/761c6… | x_refsource_MISC |
| https://github.com/mastodon/mastodon/releases/tag… | x_refsource_MISC |
| https://github.com/mastodon/mastodon/releases/tag… | x_refsource_MISC |
Impacted products
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CVE-2026-59818 (GCVE-0-2026-59818)
Vulnerability from cvelistv5 – Published: 2026-07-08 21:00 – Updated: 2026-07-09 13:13
VLAI
EPSS
VEX
Title
etcd: gRPC client listener does not enforce `--client-crl-file` certificate revocation
Summary
etcd is a distributed key-value store for the data of a distributed system. Prior to 3.5.32 and 3.6.13, when etcd is configured with --listen-client-http-urls to split HTTP and gRPC client endpoints onto separate listeners, the --client-crl-file Certificate Revocation List is not enforced on the gRPC listener, allowing a client with a revoked certificate to authenticate successfully over gRPC. This issue is fixed in versions 3.5.32 and 3.6.13.
Severity
6.5 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-09 13:13 UTC
CWE
- CWE-295 - Improper Certificate Validation
Assigner
References
9 references
| URL | Tags |
|---|---|
| https://github.com/etcd-io/etcd/security/advisori… | x_refsource_CONFIRM |
| https://github.com/etcd-io/etcd/pull/22007 | x_refsource_MISC |
| https://github.com/etcd-io/etcd/pull/22021 | x_refsource_MISC |
| https://github.com/etcd-io/etcd/pull/22025 | x_refsource_MISC |
| https://github.com/etcd-io/etcd/commit/2308ce1578… | x_refsource_MISC |
| https://github.com/etcd-io/etcd/commit/24838af5a5… | x_refsource_MISC |
| https://github.com/etcd-io/etcd/commit/8221ae82bc… | x_refsource_MISC |
| https://github.com/etcd-io/etcd/releases/tag/v3.5.32 | x_refsource_MISC |
| https://github.com/etcd-io/etcd/releases/tag/v3.6.13 | x_refsource_MISC |
Impacted products
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CVE-2026-58162 (GCVE-0-2026-58162)
Vulnerability from cvelistv5 – Published: 2026-07-29 08:36 – Updated: 2026-10-01 17:01
VLAI
EPSS
VEX
Title
Apache Traffic Server: Certifier plugin trusts client SNI when generating certificates
Summary
The Apache Traffic Server certifier plugin generates certificates based on attacker-controlled client SNI.
This issue affects Apache Traffic Server: from 8.0.0 through 8.1.11, from 9.0.0 through 9.2.14, from 10.0.0 through 10.1.3.
Users are recommended to upgrade to version 9.2.15 or 10.1.4, which fix the issue.
Severity
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-29 13:40 UTC
CWE
- CWE-295 - Improper Certificate Validation
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://lists.apache.org/thread/5prl9glcm9g2swnq9… | vendor-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Apache Software Foundation | Apache Traffic Server |
Affected:
8.0.0 , ≤ 8.1.11
(semver)
Affected: 9.0.0 , ≤ 9.2.14 (semver) Affected: 10.0.0 , ≤ 10.1.3 (semver) |
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Mitigation
Architecture and Design
Implementation
Certificates should be carefully managed and checked to assure that data are encrypted with the intended owner's public key.
Mitigation
Implementation
If certificate pinning is being used, ensure that all relevant properties of the certificate are fully validated before the certificate is pinned, including the hostname.
CAPEC-459: Creating a Rogue Certification Authority Certificate
An adversary exploits a weakness resulting from using a hashing algorithm with weak collision resistance to generate certificate signing requests (CSR) that contain collision blocks in their "to be signed" parts. The adversary submits one CSR to be signed by a trusted certificate authority then uses the signed blob to make a second certificate appear signed by said certificate authority. Due to the hash collision, both certificates, though different, hash to the same value and so the signed blob works just as well in the second certificate. The net effect is that the adversary's second X.509 certificate, which the Certification Authority has never seen, is now signed and validated by that Certification Authority.
CAPEC-475: Signature Spoofing by Improper Validation
An adversary exploits a cryptographic weakness in the signature verification algorithm implementation to generate a valid signature without knowing the key.