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CVE-2023-5356 is an incorrect authorization vulnerability in GitLab Community Edition and Enterprise Edition that affects all versions from 8.13 before 16.5.6, 16.6 before 16.6.4, and 16.7 before 16.7.2. The flaw resides in authorization handling for Slack and Mattermost integrations and allows a user to abuse slash-command functionality so that commands are executed as another GitLab user. This results in an impersonation condition within integrated chat-driven workflows, where GitLab incorrectly attributes and processes slash-command actions under the identity of a different user than the actual requester.
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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.
4 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A vulnerability in GitLab that highlights the need for strong security measures. Specific details about the vulnerability are not provided in the content.
A high-severity authorization flaw in GitLab CE/EE that allows abuse of Slack/Mattermost integrations to execute slash commands as another user.
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.