Improper Access Control in GitLab CE/EE Todos API
CVE-2026-3553 is an improper access control vulnerability in GitLab Community Edition (CE) and Enterprise Edition (EE) affecting all versions from 12.0 before 18.10.8, 18.11 before 18.11.5, and 19.0 before 19.0.2. The flaw affects the Todos API, where incorrect authorization checks under certain conditions could allow an authenticated user to access confidential issue details that should not be visible to them. The issue is an authorization failure resulting in unintended disclosure of sensitive issue metadata/content via API responses.
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Impact, mitigation & remediation
What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
Impact
What an attacker gets, and what they’ve been doing with it.
Mitigation
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Remediation
Patch, then assume compromise.
Exploits
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Affected products & vendors
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
Recent activity
4 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Information disclosure vulnerability in GitLab's Todos API caused by incorrect authorization checks, exposing confidential issue details.
Improper access control vulnerability in GitLab CE/EE Todos API that could allow an authenticated user to access confidential issue details.
The version that knows your environment.
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.