5.3

CVE-2026-5512: github enterprise_server

CVSS: 5.3v4.0MediumAnalyzed
Published 21-04-2026Last modified 22-04-2026
Open JSON

Vulnerability summary

CVE-2026-5512 is a medium (CVSS 5.3) vulnerability in github enterprise_server. EPSS estimates a 0.50% chance of exploitation in the next 30 days, higher than 41.3% of scored vulnerabilities.

Overall risk
21/100
0100
Low · default modelHow is this calculated?
CVSS score
5.3/10
010
Medium · v4.0 (CVE.org)
EPSS score
0.50%
0%100%
Low · +0.20 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 21-04-2026
    PublishedVulnerability first disclosed.
  2. 22-04-2026
    Last modifiedVulnerability information updated.

Description

An improper authorization vulnerability was identified in GitHub Enterprise Server that allowed an authenticated attacker to determine the names of private repositories by their numeric ID. The mobile upload policy API endpoint did not perform an early authorization check, and validation error messages included the full repository name for repositories the caller did not have access to. This vulnerability affected all versions of GitHub Enterprise Server prior to 3.21 and was fixed in versions 3.20.1, 3.19.5, 3.18.8, 3.17.14, 3.16.17, 3.15.21, and 3.14.26. This vulnerability was reported via the GitHub Bug Bounty program.

CVSS metrics

3 scores · 2 sources · 2 versions

EPSS trend

Probability

0.50%

Chance of exploitation in the next 30 days

Percentile

41%

Versus all other CVEs

30-day change

+0.20 pp

From 0.30% on 20-09-2026

20-09-202620-10-2026
EPSS score
0.50%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Github1 product
  • enterprise_server≥ 3.14.0, ≤ 3.14.25 | ≥ 3.15.0, ≤ 3.15.20 | ≥ 3.16.0, ≤ 3.16.16 | ≥ 3.17.0, ≤ 3.17.13 | ≥ 3.18.0, ≤ 3.18.7 | ≥ 3.19.0, ≤ 3.19.4 | ≥ 3.20.0, < 3.20.1 | < 3.14.26 | ≥ 3.15.0, < 3.15.21 | ≥ 3.16.0, < 3.16.17 | ≥ 3.17.0, < 3.17.14 | ≥ 3.18.0, < 3.18.8 | ≥ 3.19.0, < 3.19.5 | 3.20.0

1 vendor · 1 product

References

7 links