Common Weakness Enumeration

CWE-117

Allowed

Improper Output Neutralization for Logs

Abstraction: Base · Status: Draft

API response cwe.mitre.org

The product constructs a log message from external input, but it does not neutralize or incorrectly neutralizes special elements when the message is written to a log file.

234 vulnerabilities reference this CWE, most recent first.

CVE-2026-17481 (GCVE-0-2026-17481)

Vulnerability from cvelistv5 – Published: 2026-08-13 20:38 – Updated: 2026-08-14 16:28
VLAI
Title
IBM Documentation Offline is vulnerable to information disclosure, session forgery and remote code execution
Summary
IBM Documentation Offline 1.0.0 through 1.4.1 could allow a remote attacker to execute arbitrary code due to improper output neutralization for logs.
Severity
8.8 (High)
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-14 16:28 UTC
CWE
  • CWE-117 - Improper Output Neutralization for Logs
Assigner
References
URL Tags
https://www.ibm.com/support/pages/node/7283484 vendor-advisorypatch
Impacted products
Vendor Product Version
IBM Documentation Offline Affected: 1.0.0 , ≤ 1.4.1 (semver)
    cpe:2.3:a:ibm:documentation_offline:1.0.0:*:*:*:*:*:*:*
    cpe:2.3:a:ibm:documentation_offline:1.4.1:*:*:*:*:*:*:*
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CVE-2026-16189 (GCVE-0-2026-16189)

Vulnerability from cvelistv5 – Published: 2026-09-14 19:51 – Updated: 2026-09-15 18:05
VLAI
Title
IBM WebSphere Application Server prior to 9.0.5.29 and 8.5.5.31 are affected by multiple vulnerabilities
Summary
IBM WebSphere Application Server 9.0, and 8.5 could allow a remote attacker to inject forged log entries into the server's administrative log.
Severity
4.8 (Medium)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-15 17:38 UTC
CWE
  • CWE-117 - Improper Output Neutralization for Logs
Assigner
References
URL Tags
https://www.ibm.com/support/pages/node/7286610 vendor-advisorypatch
Impacted products
Vendor Product Version
IBM WebSphere Application Server Affected: 9.0
Affected: 8.5
    cpe:2.3:a:ibm:websphere_application_server:9.0:*:*:*:*:*:*:*
    cpe:2.3:a:ibm:websphere_application_server:9.0.0:*:*:*:*:*:*:*
    cpe:2.3:a:ibm:websphere_application_server:8.5:*:*:*:*:*:*:*
    cpe:2.3:a:ibm:websphere_application_server:8.5.0:*:*:*:*:*:*:*
Create a notification for this product.
Show details on NVD website
To clipboard 

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CVE-2026-16188 (GCVE-0-2026-16188)

Vulnerability from cvelistv5 – Published: 2026-09-14 19:52 – Updated: 2026-09-14 20:13
VLAI
Title
IBM WebSphere Application Server prior to 9.0.5.29 and 8.5.5.31 are affected by multiple vulnerabilities
Summary
IBM WebSphere Application Server 9.0, and 8.5 could allow a remote attacker to inject forged log entries into the server's administrative log.
Severity
5.3 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-14 20:09 UTC
CWE
  • CWE-117 - Improper Output Neutralization for Logs
Assigner
References
URL Tags
https://www.ibm.com/support/pages/node/7286610 vendor-advisorypatch
Impacted products
Vendor Product Version
IBM WebSphere Application Server Affected: 9.0
Affected: 8.5
    cpe:2.3:a:ibm:websphere_application_server:9.0:*:*:*:*:*:*:*
    cpe:2.3:a:ibm:websphere_application_server:9.0.0:*:*:*:*:*:*:*
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    cpe:2.3:a:ibm:websphere_application_server:8.5.0:*:*:*:*:*:*:*
Create a notification for this product.
Show details on NVD website
To clipboard 

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CVE-2026-15603 (GCVE-0-2026-15603)

Vulnerability from cvelistv5 – Published: 2026-08-28 13:41 – Updated: 2026-08-28 18:23
VLAI
Title
morgan vulnerable to Log Forging via unescaped Unicode line separators
Summary
morgan is an HTTP request logger middleware for Node.js. In versions prior to 1.12.0, the internal helper that escapes log token values did not neutralize the Unicode line separator characters U+0085 (Next Line), U+2028 (Line Separator), and U+2029 (Paragraph Separator). An unauthenticated remote client can place these characters in an attacker-controlled log token, for example a Basic auth username surfaced through the remote-user token, so that Unicode-aware downstream log processing splits a single request log into multiple logical records. This is a log forging issue (CWE-117) and an incomplete-fix follow-up to CVE-2026-5078, which only addressed ASCII control characters. The issue is fixed in morgan 1.12.0, which extends the escaping set to cover these Unicode line separators. Upgrade to morgan 1.12.0 to remediate.
Severity
5.3 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-28 18:23 UTC
CWE
  • CWE-117 - Improper Output Neutralization for Logs
Assigner
References
Impacted products
Vendor Product Version
morgan morgan Affected: 0 , < 1.12.0 (semver)
Create a notification for this product.
Credits
mfazrinizar UlisesGascon jonchurch bjohansebas iaohkut-from-NightWolf-Team
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CVE-2026-14350 (GCVE-0-2026-14350)

Vulnerability from cvelistv5 – Published: 2026-09-04 16:44 – Updated: 2026-09-04 17:26
VLAI
Title
Vulnerabilities exists in IBM Cloud Pak for Data System
Summary
IBM Cloud Pak for Data System 11.3.0.2 through Interim Fix 001 could allow an unauthorized user to inject data into log messages due to improper neutralization of special elements when written to log files.
Severity
5.3 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-04 17:26 UTC
CWE
  • CWE-117 - Improper Output Neutralization for Logs
Assigner
References
URL Tags
https://www.ibm.com/support/pages/node/7286036 vendor-advisorypatch
Impacted products
Vendor Product Version
IBM Cloud Pak for Data System Affected: 11.3.0.2 , ≤ Interim Fix 001 (semver)
    cpe:2.3:a:ibm:cloud_pak_for_data_system:11.3.0.2:*:*:*:*:*:*:*
    cpe:2.3:a:ibm:cloud_pak_for_data_system:interim:interim_fix_001:*:*:*:*:*:*
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CVE-2026-12616 (GCVE-0-2026-12616)

Vulnerability from cvelistv5 – Published: 2026-06-29 13:23 – Updated: 2026-06-29 13:51
VLAI
Summary
The /v1/upload/sbom endpoint extracts the iss claim from the attacker-supplied JWT with signature verification disabled, then interpolates that string into three log statements before any validation gate. Because the configured log format ("%(asctime)s - %(name)s - %(levelname)s - %(message)s") renders newlines literally, an unauthenticated attacker can forge log records that are byte-for-byte indistinguishable from PIA's genuine "Successfully authenticated project" message. PIA is an authentication broker whose logs are explicitly relied upon for incident response (DESIGN.md §5.4 lists "Token verifications" and "Errors" as events to log), so the ability to plant fake auth-success entries directly undermines the audit trail the service exists to produce.
Severity
6.9 (Medium)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-06-29 13:51 UTC
CWE
  • CWE-117 - Improper output neutralization for logs
Assigner
References
Impacted products
Vendor Product Version
Eclipse Foundation Eclipse CSI - PIA Affected: 0 , ≤ 0.2.1 (semver)
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CVE-2026-11538 (GCVE-0-2026-11538)

Vulnerability from cvelistv5 – Published: 2026-09-18 19:00 – Updated: 2026-09-18 19:46
VLAI
Title
IBM WebSphere Application Server prior to 9.0.5.29 and 8.5.5.31 are affected by multiple vulnerabilities
Summary
IBM WebSphere Application Server 9.0 and 8.5 is affected by a log injection vulnerability through crafted LTPA token cookies.
Severity
3.7 (Low)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-18 19:46 UTC
CWE
  • CWE-117 - Improper Output Neutralization for Logs
Assigner
References
URL Tags
https://www.ibm.com/support/pages/node/7286610 vendor-advisorypatch
Impacted products
Vendor Product Version
IBM WebSphere Application Server Affected: 9.0
Affected: 8.5
    cpe:2.3:a:ibm:websphere_application_server:9.0:*:*:*:*:*:*:*
    cpe:2.3:a:ibm:websphere_application_server:9.0.0:*:*:*:*:*:*:*
    cpe:2.3:a:ibm:websphere_application_server:8.5:*:*:*:*:*:*:*
    cpe:2.3:a:ibm:websphere_application_server:8.5.0:*:*:*:*:*:*:*
Create a notification for this product.
Show details on NVD website
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CVE-2026-10745 (GCVE-0-2026-10745)

Vulnerability from cvelistv5 – Published: 2026-06-24 08:04 – Updated: 2026-06-24 12:02
VLAI
Summary
Improper output neutralization for logs vulnerability in upKeeper Solutions upKeeper Instant Privilege Access on Windows allows Log Injection-Tampering-Forging. This issue affects upKeeper Instant Privilege Access: through 1.6.1.
Severity
7.9 (High)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:H
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-06-24 12:02 UTC
CWE
  • CWE-117 - Improper output neutralization for logs
Assigner
References
Impacted products
Show details on NVD website
To clipboard 

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CVE-2026-9736 (GCVE-0-2026-9736)

Vulnerability from cvelistv5 – Published: 2026-09-03 20:42 – Updated: 2026-09-05 02:18
VLAI
Title
Vulnerabilities exists in IBM Netezza Software
Summary
IBM Netezza Software 11.3.0.3 through Interim Fix 002 could allow an unauthorized user to inject data into log messages due to improper neutralization of special elements when written to log files.
Severity
5.3 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-05 02:17 UTC
CWE
  • CWE-117 - Improper Output Neutralization for Logs
Assigner
References
URL Tags
https://www.ibm.com/support/pages/node/7284359 vendor-advisorypatch
Impacted products
Vendor Product Version
IBM Netezza Software Affected: 11.3.0.3 , ≤ Interim Fix 002 (semver)
    cpe:2.3:a:ibm:netezza_software:11.3.0.3:*:*:*:*:*:*:*
    cpe:2.3:a:ibm:netezza_software:interim:interim_fix_002:*:*:*:*:*:*
Create a notification for this product.
Show details on NVD website
To clipboard 

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CVE-2026-9016 (GCVE-0-2026-9016)

Vulnerability from cvelistv5 – Published: 2026-06-06 04:28 – Updated: 2026-06-06 11:41
VLAI
Title
Debug Log Manager <= 2.5.0 - Unauthenticated Improper Output Neutralization for Logs via log_js_errors AJAX Action
Summary
The Debug Log Manager – Conveniently Monitor and Inspect Errors plugin for WordPress is vulnerable to Improper Output Neutralization for Logs in all versions up to, and including, 2.5.0. This is due to the `log_js_errors()` AJAX handler being registered for unauthenticated users via `wp_ajax_nopriv_log_js_errors` and gated only by a nonce that is publicly disclosed in every front-end page's HTML through `wp_localize_script()` whenever JavaScript error logging is enabled, providing no real authorization barrier. This makes it possible for unauthenticated attackers to inject arbitrary forged entries into the site's WordPress debug log by supplying attacker-controlled values for the `message`, `script`, `lineNo`, `columnNo`, and `pageUrl` fields — enabling spoofing of error and incident records, obscuring malicious activity within fabricated log noise, and misleading administrators who rely on the log for triage. This vulnerability is only exploitable when the plugin's JavaScript error logging feature is enabled, as the requisite nonce is only published into the page HTML under that condition.
Severity
5.3 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-06-06 11:33 UTC
CWE
  • CWE-117 - Improper Output Neutralization for Logs
Assigner
References
Impacted products
Credits
Endang Alfarisi
Show details on NVD website
To clipboard 

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Mitigation MIT-5
Implementation

Strategy: Input Validation

  • Assume all input is malicious. Use an "accept known good" input validation strategy, i.e., use a list of acceptable inputs that strictly conform to specifications. Reject any input that does not strictly conform to specifications, or transform it into something that does.
  • When performing input validation, consider all potentially relevant properties, including length, type of input, the full range of acceptable values, missing or extra inputs, syntax, consistency across related fields, and conformance to business rules. As an example of business rule logic, "boat" may be syntactically valid because it only contains alphanumeric characters, but it is not valid if the input is only expected to contain colors such as "red" or "blue."
  • Do not rely exclusively on looking for malicious or malformed inputs. This is likely to miss at least one undesirable input, especially if the code's environment changes. This can give attackers enough room to bypass the intended validation. However, denylists can be useful for detecting potential attacks or determining which inputs are so malformed that they should be rejected outright.
Mitigation MIT-30
Implementation

Strategy: Output Encoding

Use and specify an output encoding that can be handled by the downstream component that is reading the output. Common encodings include ISO-8859-1, UTF-7, and UTF-8. When an encoding is not specified, a downstream component may choose a different encoding, either by assuming a default encoding or automatically inferring which encoding is being used, which can be erroneous. When the encodings are inconsistent, the downstream component might treat some character or byte sequences as special, even if they are not special in the original encoding. Attackers might then be able to exploit this discrepancy and conduct injection attacks; they even might be able to bypass protection mechanisms that assume the original encoding is also being used by the downstream component.

Mitigation MIT-20
Implementation

Strategy: Input Validation

Inputs should be decoded and canonicalized to the application's current internal representation before being validated (CWE-180). Make sure that the application does not decode the same input twice (CWE-174). Such errors could be used to bypass allowlist validation schemes by introducing dangerous inputs after they have been checked.

CAPEC-268: Audit Log Manipulation

The attacker injects, manipulates, deletes, or forges malicious log entries into the log file, in an attempt to mislead an audit of the log file or cover tracks of an attack. Due to either insufficient access controls of the log files or the logging mechanism, the attacker is able to perform such actions.

CAPEC-81: Web Server Logs Tampering

Web Logs Tampering attacks involve an attacker injecting, deleting or otherwise tampering with the contents of web logs typically for the purposes of masking other malicious behavior. Additionally, writing malicious data to log files may target jobs, filters, reports, and other agents that process the logs in an asynchronous attack pattern. This pattern of attack is similar to "Log Injection-Tampering-Forging" except that in this case, the attack is targeting the logs of the web server and not the application.

CAPEC-93: Log Injection-Tampering-Forging

This attack targets the log files of the target host. The attacker injects, manipulates or forges malicious log entries in the log file, allowing them to mislead a log audit, cover traces of attack, or perform other malicious actions. The target host is not properly controlling log access. As a result tainted data is resulting in the log files leading to a failure in accountability, non-repudiation and incident forensics capability.

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