How severe is CVE-2016-4340?

CVE-2016-4340 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2016-4340 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 10% (95th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2016-4340?

CVE-2016-4340 primarily affects Gitlab. In total, 45 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2016-4340?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2016-4340 published?

CVE-2016-4340 was published on 2017-01-23 and last updated on 2026-06-17.

CVE-2016-4340

CVE-2016-4340 is a high-severity vulnerability in Gitlab with a CVSS 3.x base score of 8.8. Its EPSS exploit-prediction score of 10% places it in the 95th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-264.

Key facts

Severity: High (CVSS 3.x base score 8.8)
CVSS v2: 6.5
EPSS exploit prediction: 10% (95th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-264
Affected product: Gitlab
Published: 2017-01-23
Last modified: 2026-06-17

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.

Frequently asked questions

What is 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 8.4.9, 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.
How severe is CVE-2016-4340?: CVE-2016-4340 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2016-4340 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 10% (95th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2016-4340?: CVE-2016-4340 primarily affects Gitlab. In total, 45 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2016-4340?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2016-4340 published?: CVE-2016-4340 was published on 2017-01-23 and last updated on 2026-06-17.

References

Affected products (45)

cpe:2.3:a:gitlab:gitlab:8.2.0:*:*:*:*:*:*:*
cpe:2.3:a:gitlab:gitlab:8.2.1:*:*:*:*:*:*:*
cpe:2.3:a:gitlab:gitlab:8.2.2:*:*:*:*:*:*:*
cpe:2.3:a:gitlab:gitlab:8.2.3:*:*:*:*:*:*:*
cpe:2.3:a:gitlab:gitlab:8.2.4:*:*:*:*:*:*:*
cpe:2.3:a:gitlab:gitlab:8.3.0:*:*:*:*:*:*:*
cpe:2.3:a:gitlab:gitlab:8.3.1:*:*:*:*:*:*:*
cpe:2.3:a:gitlab:gitlab:8.3.2:*:*:*:*:*:*:*
cpe:2.3:a:gitlab:gitlab:8.3.3:*:*:*:*:*:*:*
cpe:2.3:a:gitlab:gitlab:8.3.4:*:*:*:*:*:*:*
cpe:2.3:a:gitlab:gitlab:8.3.5:*:*:*:*:*:*:*
cpe:2.3:a:gitlab:gitlab:8.3.6:*:*:*:*:*:*:*
cpe:2.3:a:gitlab:gitlab:8.3.7:*:*:*:*:*:*:*
cpe:2.3:a:gitlab:gitlab:8.3.8:*:*:*:*:*:*:*
cpe:2.3:a:gitlab:gitlab:8.4.0:*:*:*:*:*:*:*
cpe:2.3:a:gitlab:gitlab:8.4.1:*:*:*:*:*:*:*
cpe:2.3:a:gitlab:gitlab:8.4.2:*:*:*:*:*:*:*
cpe:2.3:a:gitlab:gitlab:8.4.3:*:*:*:*:*:*:*
cpe:2.3:a:gitlab:gitlab:8.4.4:*:*:*:*:*:*:*
cpe:2.3:a:gitlab:gitlab:8.4.5:*:*:*:*:*:*:*
cpe:2.3:a:gitlab:gitlab:8.4.6:*:*:*:*:*:*:*
cpe:2.3:a:gitlab:gitlab:8.4.7:*:*:*:*:*:*:*
cpe:2.3:a:gitlab:gitlab:8.4.8:*:*:*:*:*:*:*
cpe:2.3:a:gitlab:gitlab:8.4.9:*:*:*:*:*:*:*
cpe:2.3:a:gitlab:gitlab:8.5.0:*:*:*:*:*:*:*
cpe:2.3:a:gitlab:gitlab:8.5.1:*:*:*:*:*:*:*
cpe:2.3:a:gitlab:gitlab:8.5.2:*:*:*:*:*:*:*
cpe:2.3:a:gitlab:gitlab:8.5.3:*:*:*:*:*:*:*
cpe:2.3:a:gitlab:gitlab:8.5.4:*:*:*:*:*:*:*
cpe:2.3:a:gitlab:gitlab:8.5.5:*:*:*:*:*:*:*
cpe:2.3:a:gitlab:gitlab:8.5.6:*:*:*:*:*:*:*
cpe:2.3:a:gitlab:gitlab:8.5.7:*:*:*:*:*:*:*
cpe:2.3:a:gitlab:gitlab:8.5.8:*:*:*:*:*:*:*
cpe:2.3:a:gitlab:gitlab:8.5.9:*:*:*:*:*:*:*
cpe:2.3:a:gitlab:gitlab:8.5.10:*:*:*:*:*:*:*
cpe:2.3:a:gitlab:gitlab:8.5.11:*:*:*:*:*:*:*
cpe:2.3:a:gitlab:gitlab:8.6.0:*:*:*:*:*:*:*
cpe:2.3:a:gitlab:gitlab:8.6.1:*:*:*:*:*:*:*
cpe:2.3:a:gitlab:gitlab:8.6.2:*:*:*:*:*:*:*
cpe:2.3:a:gitlab:gitlab:8.6.3:*:*:*:*:*:*:*

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