GitLab has remediated an issue in GitLab CE/EE affecting all versions from 15.6 before 18.4.6, 18.5 before 18.5.4, and 18.6 before 18.6.2 that could have allowed an authenticated user to, under certain conditions, render content in dialogs to other users by injecting malicious HTML content into merge request titles.

The version of GitLab installed on the remote host is affected by a vulnerability, as follows:

  - GitLab has remediated an issue in GitLab CE/EE affecting all versions from 15.6 before 18.4.6, 18.5 before     18.5.4, and 18.6 before 18.6.2 that could have allowed an authenticated user to, under certain conditions,     render content in dialogs to other users by injecting malicious HTML content into merge request titles.
    (CVE-2025-12734)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - GitLab has remediated an issue in GitLab CE/EE affecting all versions from 15.6 before 18.4.6, 18.5 before     18.5.4, and 18.6 before 18.6.2 that could have allowed an authenticated user to, under certain conditions,     render content in dialogs to other users by injecting malicious HTML content into merge request titles.
    (CVE-2025-12734)

Note that Nessus relies on the presence of the package as reported by the vendor.

The version of FreeBSD installed on the remote host is prior to tested version. It is, therefore, affected by multiple vulnerabilities as referenced in the c6c9306e-d645-11f0-8ce2-2cf05da270f3 advisory.

    Gitlab reports:
    Cross-site scripting issue in Wiki impacts GitLab CE/EE     Improper encoding in vulnerability reports impacts GitLab CE/EE     Cross-site scripting issue in Swagger UI impacts GitLab CE/EE     Denial of service issue in GraphQL endpoints impacts GitLab CE/EE     Authentication bypass issue for WebAuthn users impacts GitLab CE/EE     Denial of service issue in ExifTool processing impacts GitLab CE/EE     Denial of service issue in Commit API impacts GitLab CE/EE     Information disclosure issue in compliance frameworks impacts GitLab EE     Information disclosure through error messages impacts GitLab CE/EE     HTML injection issue in merge request titles impacts GitLab CE/EE

Tenable has extracted the preceding description block directly from the FreeBSD security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

ID	Name	Product	Family	Severity
298843	GitLab 15.6 < 18.4.6 / 18.5 < 18.5.4 / 18.6 < 18.6.2 (CVE-2025-12734)	Nessus	CGI abuses	low
294828	Linux Distros Unpatched Vulnerability : CVE-2025-12734	Nessus	Misc.	low
278383	FreeBSD : Gitlab -- vulnerabilities (c6c9306e-d645-11f0-8ce2-2cf05da270f3)	Nessus	FreeBSD Local Security Checks	high

Detections

Analytics

CVE-2025-12734

low

Tenable Plugins

low

low

high