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CVE-2025-8405 is a high-severity improper encoding vulnerability in GitLab Community Edition and Enterprise Edition. Affected versions fail to safely encode untrusted content rendered in vulnerability report code flow displays, allowing malicious HTML injection. An authenticated attacker can place crafted HTML into content that is later displayed to another user in the vulnerability reporting interface, which can execute in that user’s browser context and enable actions to be performed on the victim’s behalf. Affected versions are GitLab CE/EE 17.1 through before 18.4.6, 18.5.x before 18.5.4, and 18.6.x before 18.6.2.
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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.
10 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A high-severity improper encoding issue leading to HTML injection in GitLab vulnerability reports.
A high-severity improper encoding or escaping of output vulnerability in GitLab CE/EE that allows authenticated users to inject malicious HTML into vulnerability code flow displays, potentially enabling unauthorized actions on behalf of other users.
A high-severity improper encoding flaw in GitLab vulnerability reports that could allow an authenticated user to inject malicious HTML and perform unauthorized actions on behalf of other users.
An improper encoding/HTML injection issue in GitLab vulnerability report code flow displays that could enable authenticated users to inject HTML and act on behalf of others.
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.