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Fencer Vulns
high 8.8

CVE-2016-4340 in the critical feed json

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 thr…

published 2017-01-23 9 y ago modified 2026-06-17 4 mo ago also EUVD-2016-5340

cvss
8.8
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
10.1%
EPSS 10.1% chance of exploitation in 30 days, percentile 95%
public exploits
1
Exploit-DB

Summary

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.

Patch / fix

Timeline

  1. First public exploit (EDB-40236)
  2. Published

Exploit prediction

10.14% chance of exploitation in the next 30 days, higher than 95% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • EDB-40236 GitLab - 'impersonate' Feature Privilege Escalation webapps, 2016-08-15
  • packetstormsecurity.com http://packetstormsecurity.com/files/138368/GitLab-Impersonate-Privilege-Escalation.html referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.0 8.8 CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 6.5 AV:N/AC:L/Au:S/C:P/I:P/A:P

Classification

Weakness
  • CWE-264 Permissions, Privileges, and Access Controls
Technology feeds

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.