Common Weakness Enumeration

CWE-295

Allowed

Improper Certificate Validation

Abstraction: Base · Status: Draft

The product does not validate, or incorrectly validates, a certificate.

2256 vulnerabilities reference this CWE, most recent first.

CVE-2026-76362 (GCVE-0-2026-76362)

Vulnerability from cvelistv5 – Published: 2026-08-19 21:34 – Updated: 2026-08-21 03:56
VLAI
Title
Improper Certificate Validation through CyberArk Vault Privileged Access Manager in Splunk SOAR
Summary
In Splunk SOAR versions below 8.6.0, an unauthenticated user who can observe or alter network traffic between Splunk SOAR and a configured CyberArk Representational State Transfer (REST) server could access or modify all relevant data exchanged through that credential manager. The vulnerability is possible because the CyberArk REST client does not verify server certificates by default. The attack requires the attacker to have network-path interception capability between Splunk SOAR and the configured CyberArk REST server. For more information see Manage your organization's credentials with a password vault (https://help.splunk.com/en/splunk-soar/soar-cloud/administer-soar-cloud/configure-administration-settings-in-splunk-soar-cloud/manage-your-organizations-credentials-with-a-password-vault) in the Splunk documentation.
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-20 00:00 UTC
CWE
  • CWE-295 - The software does not validate, or incorrectly validates, a certificate.
Impacted products
Vendor Product Version
Splunk Splunk SOAR Affected: 8.6 , < 8.6.0 (custom)
Create a notification for this product.
Date Public
2026-08-19 00:00
Show details on NVD website

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CVE-2026-76242 (GCVE-0-2026-76242)

Vulnerability from cvelistv5 – Published: 2026-08-19 14:02 – Updated: 2026-08-20 15:38
VLAI
Title
stigmem Federation Peer Registration Authentication Bypass
Summary
stigmem-node 0.9.0a1 accepts federation peer key material during peer registration without a separate administrator out-of-band fingerprint approval step. On nodes that accept federation peer registration over a network where initial registration can be intercepted or misdirected, an attacker can register a malicious peer and gain access to or tamper with federation traffic. Fixed in 0.9.0a2, which introduces a pending approval flow requiring administrator fingerprint verification before peer tokens are accepted.
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-20 15:37 UTC
CWE
  • CWE-295 - Improper Certificate Validation
References
Impacted products
Vendor Product Version
eidetic-labs stigmem Affected: 0 , < 0.9.0a2 (custom)
Unaffected: 0.9.0a2 (custom)
Create a notification for this product.
Date Public
2026-05-19 00:00
Show details on NVD website

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CVE-2026-74774 (GCVE-0-2026-74774)

Vulnerability from cvelistv5 – Published: 2026-08-26 19:05 – Updated: 2026-08-27 14:42
VLAI
Summary
Dell PowerProtect One, versions 20.1.0.0 and below, contain an Improper Certificate Validation vulnerability. An unauthenticated attacker with remote access could potentially exploit this vulnerability, leading to Protection mechanism bypass.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-27 14:41 UTC
CWE
  • CWE-295 - Improper Certificate Validation
References
Impacted products
Vendor Product Version
Dell PowerProtect One Affected: 0 , < 20.3.0.0 (semver)
Create a notification for this product.
Date Public
2026-08-23 18:30
Show details on NVD website

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CVE-2026-73594 (GCVE-0-2026-73594)

Vulnerability from cvelistv5 – Published: 2026-09-29 11:32 – Updated: 2026-09-30 03:56
VLAI
Summary
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SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-29 00:00 UTC
CWE
  • CWE-295 - Improper Certificate Validation
References
Impacted products
Vendor Product Version
Dell Secure Connect Gateway (SCG) Policy Manager Affected: 0 , < 5.36.00.16 or later (semver)
Create a notification for this product.
Date Public
2026-08-31 06:30
Show details on NVD website

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CVE-2026-73587 (GCVE-0-2026-73587)

Vulnerability from cvelistv5 – Published: 2026-09-23 14:21 – Updated: 2026-09-24 03:55
VLAI
Summary
Dell Secure Connect Gateway (SCG) Policy Manager, versions prior to 5.34.00.16, contains an Improper Certificate Validation vulnerability. An unauthenticated attacker with adjacent network access could potentially exploit this vulnerability, leading to Information disclosure, Information tampering, and Protection mechanism bypass.
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-23 00:00 UTC
CWE
  • CWE-295 - Improper Certificate Validation
References
Impacted products
Vendor Product Version
Dell Secure Connect Gateway (SCG) Policy Manager Affected: 0 , < 5.36.00.16 or later (semver)
Create a notification for this product.
Date Public
2026-08-31 06:30
Show details on NVD website

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CVE-2026-73253 (GCVE-0-2026-73253)

Vulnerability from cvelistv5 – Published: 2026-08-20 17:41 – Updated: 2026-08-20 18:36
VLAI
Title
Mongoose: TLS Hostname Verification Bypass via Overly Permissive Wildcard Matching
Summary
Mongoose is an embedded web server and network library. Prior to version 7.22, an on-path network attacker with a wildcard certificate for a parent domain can impersonate deeper subdomains to a client using the built-in TLS stack. The mg_tls_verify_cert_san() and mg_tls_verify_cert_cn() functions in src/tls_builtin.c call mg_match(), whose wildcard can cross DNS label boundaries, so a pattern such as *.example.com can match foo.bar.example.com. The resulting hostname verification bypass permits interception and modification of TLS traffic. This issue is fixed in version 7.22.
SSVC
Exploitation: poc Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-20 18:33 UTC
CWE
  • CWE-295 - Improper Certificate Validation
Impacted products
Vendor Product Version
cesanta mongoose Affected: < 7.22
Create a notification for this product.
Show details on NVD website

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CVE-2026-73251 (GCVE-0-2026-73251)

Vulnerability from cvelistv5 – Published: 2026-08-20 17:34 – Updated: 2026-08-20 19:50
VLAI
Title
Mongoose Built-in TLS: CA-bundle certificate chain accepted without any signature verification
Summary
Mongoose is an embedded web server and network library. Prior to 7.23, a network attacker can impersonate a TLS server to a Mongoose client configured with a multi-certificate CA bundle. In src/tls_builtin.c, the mg_tls_init() function stores the bundle in tls->ca_bundle_der while tls->ca_der.len remains zero, and mg_tls_recv_cert() uses tls_bundle_find() to accept a Common Name match without calling mg_tls_verify_cert_signature(). A forged self-signed certificate can therefore satisfy hostname and CertificateVerify checks and enable interception, credential disclosure, traffic modification, and malicious responses. This issue is fixed in version 7.23.
SSVC
Exploitation: none Automatable: yes Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-20 19:50 UTC
CWE
  • CWE-295 - Improper Certificate Validation
Impacted products
Vendor Product Version
cesanta mongoose Affected: < 7.23
Create a notification for this product.
Show details on NVD website

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CVE-2026-71889 (GCVE-0-2026-71889)

Vulnerability from cvelistv5 – Published: 2026-10-03 08:31 – Updated: 2026-10-05 16:57
VLAI
Title
PKIXCertPathReviewer does not apply X.509 name constraints to the target certificate
Summary
In Bouncy Castle for Java before 1.86, neither copy of PKIXCertPathReviewer - org.bouncycastle.pkix.jcajce.PKIXCertPathReviewer nor the legacy org.bouncycastle.x509.PKIXCertPathReviewer - applied X.509 name constraints to the end-entity certificate. checkNameConstraints walked the path with a loop bound of index greater than zero, which is the bound the CA-only steps require, but index zero is the target certificate under the standard CertPath ordering, so the permitted and excluded subtree checks of RFC 5280 sec. 6.1.3 (b) and (c) never ran against the leaf's subject DN or its subjectAltName. A chain whose leaf violated a NameConstraints extension imposed by its own issuing CA therefore reported isValidCertPath() true with an empty error list, while CertPathValidator.getInstance("PKIX", "BC"), which shares no code with the reviewer, rejected the identical chain against the identical trust anchor. An application using the reviewer to make the trust decision rather than for diagnostics alongside a real validation accepted a certificate the constrained CA was never authorised to issue. Both copies now check every certificate in the path including the target, waive the sec. 4.2.1.10 self-issued exemption for the final certificate as sec. 6.1.3 requires, and skip the sec. 6.1.4 (g) constraint-accumulation step for the target. This issue also affects Bouncy Castle for Java LTS before 2.73.13, which carries only the org.bouncycastle.pkix.jcajce copy of the reviewer. It also affects Bouncy Castle for Java FIPS (BC-FJA) before bcpkix-fips 1.0.13 (1.0.X series), 2.0.13 (2.0.X series) and 2.1.13 (2.1.X series).
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-05 16:55 UTC
CWE
  • CWE-295 - Improper Certificate Validation
Impacted products
Vendor Product Version
Legion of the Bouncy Castle Inc. BC-JAVA Affected: 0 , < 1.86 (maven)
Create a notification for this product.
Legion of the Bouncy Castle Inc. BC-LTS-JAVA Affected: 2.73.0 , < 2.73.13 (maven)
Create a notification for this product.
Legion of the Bouncy Castle Inc. BC-FJA Affected: 1.0.4 , < 1.0.13 (maven)
Affected: 2.0.0 , < 2.0.13 (maven)
Affected: 2.1.0 , < 2.1.13 (maven)
Create a notification for this product.
Show details on NVD website

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CVE-2026-71885 (GCVE-0-2026-71885)

Vulnerability from cvelistv5 – Published: 2026-10-03 08:51 – Updated: 2026-10-05 16:01
VLAI
Title
MLS X.509 credential not bound to the LeafNode signature key
Summary
In Bouncy Castle for Java before 1.86, the Messaging Layer Security (MLS, RFC 9420) implementation did not bind an X.509 credential to a LeafNode's signature_key. LeafNode.verify() checked a leaf's signature against the signature_key carried in the leaf itself, while the credential's X.509 certificate chain was stored but never parsed or validated, so the end-entity certificate's public key was never required to match signature_key as RFC 9420 sec. 5.3 requires. A party could therefore present another party's certificate as its credential while signing the leaf, and the enclosing KeyPackage, with an unrelated key, and be accepted under that other party's identity through KeyPackage.verify() and the Group leaf-validation path. In a deployment that admits external commits without an independent credential-admission check, an unauthenticated attacker could be admitted under a victim's X.509 identity, evict the victim (resynchronization compares whole credentials rather than signing keys), derive the current epoch, decrypt subsequent group messages, and send messages accepted as the victim. TreeKEM.LeafNode now requires the end-entity certificate's subject public key, in the cipher suite's signature encoding, to equal signature_key for an X.509 credential and rejects the leaf otherwise, including an empty chain or a certificate whose key type does not match the cipher suite; certificate-chain and identity validation to a trust anchor remain the application's responsibility per RFC 9420 sec. 5.3.1. Deployments using only basic credentials are unaffected.
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-05 16:00 UTC
CWE
  • CWE-295 - Improper Certificate Validation
  • CWE-287 - Improper Authentication
Impacted products
Vendor Product Version
Legion of the Bouncy Castle Inc. BC-JAVA Affected: 0 , < 1.86 (maven)
Create a notification for this product.
Show details on NVD website

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CVE-2026-71290 (GCVE-0-2026-71290)

Vulnerability from cvelistv5 – Published: 2026-08-11 20:33 – Updated: 2026-09-24 03:55
VLAI
Title
Apache HttpComponents Client: TLS hostname verification silently disabled on the async transport (default config, MITM)
Summary
Improper TLS hostname verification vulnerability in Apache HttpComponents Client 5.4 or newer. HostnameVerificationPolicy#BUILTIN setting has no effect when used with the async version of HttpClient. An attacker that can intercept and modify traffic between the client and the server can impersonate the server by presenting a valid certificate for a different domain.  Please note the classic version of HttpClient is not affected by this vulnerability.  Affected users are recommended to upgrade to at least version 5.6.4, which fixes the issue.
SSVC
Exploitation: none Automatable: yes Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-23 00:00 UTC
CWE
  • CWE-295 - Improper Certificate Validation
Impacted products
Vendor Product Version
Apache Software Foundation Apache HttpComponents Client Affected: 5.4-alpha , ≤ 5.6.3 (semver)
Create a notification for this product.
Credits
Show details on NVD website

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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.