VIR Vulnerability Intelligence Relay

CVE-2016-4340

high
Published 2017-01-23 · Modified 2026-05-13
💬 Discuss on Community ✚ Propose mitigation
CVSS v3
8.8
CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CVSS v4 NEW
—
not yet in upstream
VIR risk
9.8

Description

The impersonate feature in Gitlab 8.7.0, 8.6.0 through 8.6.7, 8.5.0 through 8.5.11, 8.4.0 through 8.4.9, 8.3.0 through 8.3.8, and 8.2.0 through 8.2.4 allows remote authenticated users to "log in" as any other user via unspecified vectors.

Predictions

Exploit likelihood
92%
Patch ETA
—

Heuristic predictions, AS-IS, for prioritization only.

Mitigations

No mitigations published for this CVE yet.

The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.

✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here with source_tier=community-verified.

Exploits

Public proof-of-concept code below. AS-IS, for defenders and authorised testing only.

Exploit-DB

EDB-40236 webapps ruby
Kaimi · 2016-08-15

GitLab - 'impersonate' Feature Privilege Escalation

Source code queued for fetch — refresh in a moment.

Application impact
VendorProductVersionsFixed
gitlabgitlab8.2.0
gitlabgitlab8.2.1
gitlabgitlab8.2.2
gitlabgitlab8.2.3
gitlabgitlab8.2.4
gitlabgitlab8.3.0
gitlabgitlab8.3.1
gitlabgitlab8.3.2
gitlabgitlab8.3.3
gitlabgitlab8.3.4
gitlabgitlab8.3.5
gitlabgitlab8.3.6
gitlabgitlab8.3.7
gitlabgitlab8.3.8
gitlabgitlab8.4.0
gitlabgitlab8.4.1
gitlabgitlab8.4.2
gitlabgitlab8.4.3
gitlabgitlab8.4.4
gitlabgitlab8.4.5
gitlabgitlab8.4.6
gitlabgitlab8.4.7
gitlabgitlab8.4.8
gitlabgitlab8.4.9
gitlabgitlab8.5.0
gitlabgitlab8.5.1
gitlabgitlab8.5.2
gitlabgitlab8.5.3
gitlabgitlab8.5.4
gitlabgitlab8.5.5
gitlabgitlab8.5.6
gitlabgitlab8.5.7
gitlabgitlab8.5.8
gitlabgitlab8.5.9
gitlabgitlab8.5.10
gitlabgitlab8.5.11
gitlabgitlab8.6.0
gitlabgitlab8.6.1
gitlabgitlab8.6.2
gitlabgitlab8.6.3
gitlabgitlab8.6.4
gitlabgitlab8.6.5
gitlabgitlab8.6.6
gitlabgitlab8.6.7
gitlabgitlab8.7.0

References

CWEs

CWE-264

Community-verified mitigations for this CVE will appear above when contributors publish them.

Verify integrity in audit chain (admin only). AS-IS.