CRITICAL CWE-502
CVE-2026-87719
Deserialization of Untrusted Data in GitLab
9.9/ 10
CVSS 3.1
Critical severity
0.57%
EPSS exploit odds
Chance of exploitation in the next 30 days
Higher than 48% of all CVEs
Not listed
CISA KEV catalog
No confirmed in-the-wild exploitation on CISA's list.
Timeline
- Published
- Sep 12, 2026
- Updated
- Sep 23, 2026
- First covered
- Sep 12, 2026
- Latest story
- 2 months ago
Summary
GitLab has remediated an issue in GitLab EE affecting all versions from 18.3 before 18.11.12, 19.0 before 19.0.9, 19.1 before 19.1.8, 19.2 before 19.2.6, and 19.3 before 19.3.2 that under certain conditions could allow an authenticated user with Duo Chat access to obtain Advanced Search instance configurations and sensitive credentials using a specially crafted GraphQL subscription argument to bypass serialization and perform server object lookup.
CWE-502Deserialization of Untrusted Data
Attack profile
Attack vectorNetwork
ComplexityLow
PrivilegesLow
User interactionNone
ScopeChanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:HAffected products
- GitLab18.3 to before 18.11.1219.0 to before 19.0.919.1 to before 19.1.819.2 to before 19.2.6