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Vulnerability record · CVE-2026-87719 · published 12 September 2026

CVE-2026-87719: Deserialization of untrusted data vulnerability

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.

9.9 CVSS 3.1 Critical EPSS 0.57% · top 55.0% CWE-502 · Deserialization of untrusted data Awaiting Analysis
9.9CVSS 3.1 base score
0.57%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
2References
23 Sep 2026Last modified by NVD

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:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

References

LinkTags
https://gitlab.com/gitlab-org/gitlab/-/work_items/628160
https://hackerone.com/reports/4012289

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Source: NIST National Vulnerability Database (record CVE-2026-87719), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.