Critical severity · published Sep 12, 2026
CVE-2026-87719
Deserialization of Untrusted Data in GitLab
9.9
CVSS
0.6%
EPSS
No
On KEV
Description
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.6% · higher than 47% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
GI
GitLab · GitLab
18.3 before 18.11.12; 19.0 before 19.0.9; 19.1 before 19.1.8; 19.2 before 19.2.6; 19.3 before 19.3.2 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-87719
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-87719
Broken Link
https://gitlab.com/gitlab-org/gitlab/-/work_items/628160
Permissions Required
https://hackerone.com/reports/4012289
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