CVE-2021-39891

MEDIUMNVD 5.94.9▼

5.9

In all versions of GitLab CE/EE since version 8.0, access tokens created as part of admin's impersonation of a user are not cleared at the end of impersonation which may lead to unnecessary sensitive info disclosure.

CVSS v3: 5.9
EG Score: 4.9(medium)
EPSS: 29.5%
KEV: Not listed

Published

October 5, 2021

Last Modified

November 21, 2024

References (4)

cve@gitlabhttps://gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-39891.json
cve@gitlabhttps://gitlab.com/gitlab-org/gitlab/-/issues/335137
af854a3a-2127-422b-91ae-364da2661108https://gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-39891.json
af854a3a-2127-422b-91ae-364da2661108https://gitlab.com/gitlab-org/gitlab/-/issues/335137

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 9× in last 7d / 9× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-05-27 13:39 UTCepss_batch
2026-05-27 13:39 UTCepss_batch
2026-05-26 13:42 UTCepss_batch
2026-05-26 13:42 UTCepss_batch
2026-05-26 09:30 UTCEG score recompute
2026-05-26 09:30 UTCGHSA enrichment
2026-05-26 07:17 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-26 07:17 UTCepss_batch

Frequently asked(5)

What is CVE-2021-39891?

CVE-2021-39891 is a medium vulnerability published on October 5, 2021. In all versions of GitLab CE/EE since version 8.0, access tokens created as part of admin's impersonation of a user are not cleared at the end of impersonation which may lead to unnecessary sensitive info disclosure.

When was CVE-2021-39891 disclosed?

CVE-2021-39891 was first published in the National Vulnerability Database on October 5, 2021, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2021-39891 actively exploited?

CVE-2021-39891 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 29.5% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2021-39891?

CVE-2021-39891 has a CVSS v3 base score of 5.9 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 4.9.

How do I remediate CVE-2021-39891?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-39891, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2021-39891

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CVE-2021-39891

📅 Published

🔄 Last Modified

🔗 References (4)