EUVD-2026-78909
GHSA-q9w7-g33h-p2jw
Severity by source
AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
Bypass is network-reachable and low complexity but requires a valid account and SAML enforcement configured, so PR:L with partial C/I and no availability impact.
Primary rating from Vendor (GitLab).
CVSS VectorVendor: GitLab
Lifecycle Timeline
3DescriptionCVE.org
GitLab has remediated an issue in GitLab CE/EE affecting all versions from 18.6 before 19.1.8, 19.2 before 19.2.6, and 19.3 before 19.3.2 that under certain conditions could have allowed an authenticated user to bypass SAML SSO sign-in restrictions and authenticate without SSO due to missing authentication enforcement checks.
AnalysisAI
GitLab CE/EE instances that enforce SAML single sign-on can be bypassed by an authenticated user who signs in through another authentication path, because the sign-in enforcement check is missing (CWE-306). Affected releases are all versions from 18.6 up to 19.1.7, 19.2.x through 19.2.5, and 19.3.0/19.3.1; GitLab has published fixes in 19.1.8, 19.2.6 and 19.3.2. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The attacker must already possess valid credentials for an account on the target GitLab instance, which is why the CVSS vector carries PR:L, and the instance must be configured to enforce SAML SSO sign-in for the relevant group or instance - that configuration is what the missing enforcement check fails to uphold. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS vector (AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N) describes a network-reachable, low-complexity issue that still requires the attacker to hold a valid low-privileged account - this is an authenticated control bypass, not a pre-auth compromise, which is why the base score sits at 5.4 rather than critical. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Upgrade immediately to GitLab 19.3.2, 19.2.6, or 19.1.8 (or later) as appropriate for your release line - these are the vendor-fixed versions and are the only complete remedy; the advisory is at https://gitlab.com/gitlab-org/gitlab/-/work_items/603742. … Detailed patch versions, workarounds, and compensating controls in full report. |
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Same technique Authentication Bypass
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External POC / Exploit Code
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