CVE-2016-4340

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...

8.8 HighPublic exploit

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.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: Low
User interaction: None

What an attacker can affect

Confidentiality: High
Integrity: High
Availability: High

Exploit likelihood

10.1%Up 2.1 points since Feb 4, 2022

What each source reports

NVD Score used 8.8

Record: CVE-2016-4340
CVSS 3.0: 8.8 HighCVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CVSS 2.0: 6.5 MediumAV:N/AC:L/Au:S/C:P/I:P/A:P
Weakness: CWE-264
Updated: 2026-11-02

CVE List No score

Record: CVE-2016-4340
Updated: 2026-11-02

EUVDEUVD-2016-5340 No score

Record: EUVD-2016-5340
Updated: 2026-11-03

GitHub AdvisoriesGHSA-rxh8-jh3g-ccqq 8.8

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...

Record: GHSA-rxh8-jh3g-ccqq
CVSS 3.0: 8.8 HighCVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Updated: 2026-11-02

OSV 8.8

Record: CVE-2016-4340
CVSS 3.0: 8.8 HighCVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Updated: 2026-11-02

OSVUBUNTU-CVE-2016-4340 8.8

Record: UBUNTU-CVE-2016-4340
CVSS 3.0: 8.8 HighCVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Updated: 2026-11-02

Affected products

gitlab

Affected packages

Affected packages
Package	Affected	Fixed
`gitlab` Ubuntu:16.04:LTS	All versions, plus listed versions 8.4.3+dfsg-98.4.3+dfsg-128.5.8+dfsg-5	None known

Public exploits

Links only. Every CVE stores no exploit code.

Public exploits
Source	Link	Date
Exploit-DB	GitLab - 'impersonate' Feature Privilege Escalation	2016-08-15

History

History
Recorded	Changed	Sources
Nov 3, 2026	aliases	EUVD
Nov 2, 2026	first indexed	CVE List, Exploit-DB, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2016-4340 is a high vulnerability (CVSS 8.8) in Gitlab, published January 23, 2017. Public exploit code exists. EPSS puts the chance of exploitation in the next 30 days at 10.1%, the 95th percentile. No source names a fixed version.