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CVE-2025-12734 is a low-severity HTML injection vulnerability in GitLab Community Edition and Enterprise Edition. It affects all versions from 15.6 before 18.4.6, 18.5 before 18.5.4, and 18.6 before 18.6.2. Under certain conditions, an authenticated user can inject malicious HTML into a merge request title, causing that content to be rendered in dialogs viewed by other users. The issue arises from improper neutralization of user-controlled content in merge request title rendering contexts, enabling attacker-supplied markup to be displayed in another user's browser interface.
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No public exploit code observed for this vulnerability.
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
9 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A low-severity HTML injection vulnerability in GitLab merge request titles.
A low-severity HTML injection vulnerability in GitLab merge request titles that could allow an authenticated user to render malicious content in dialogs shown to other users.
An HTML injection issue in GitLab merge request titles that could allow an authenticated user to inject HTML rendered to other users in dialogs.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.