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CVE-2026-75101

Authorization bypass vulnerability in GitHub Enterprise Server allowed reading of private pull request diffs and patches via repository name collision

MEDIUM
6.5
CVSS Score
Published: September 22, 2026 at 08:43 PM UTC
Updated: October 2, 2026 at 06:46 PM UTC
1 product affected across 1 vendorGitHub Enterprise Server

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Severity
MEDIUM6.5
Exploit prediction
EPSS 0.3%
SSVC
No known exploit

Description

An authorization bypass vulnerability was identified in GitHub Enterprise Server that allowed any authenticated user of the instance to read the raw diff or patch of pull requests in private repositories without authorization. Access tokens for raw pull request diffs and patches were scoped to the repository name and pull request number rather than to a globally unique repository identifier, so an attacker who created a repository and pull request matching a target's repository name and pull request number could use a token for their own repository to retrieve the private pull request's contents. Exploitation required the attacker to know the target repository's name and a valid pull request number. This vulnerability affected all versions of GitHub Enterprise Server prior to 3.22 and was fixed in versions 3.17.21, 3.18.15, 3.19.12, 3.20.8, and 3.21.6. This vulnerability was reported via the GitHub Bug Bounty program.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

GitHub Enterprise Server· GitHubgithub-action
95%
3.17.0 ≤ v < 3.17.*3.17.0 ≤ v < 3.17.213.18.0 ≤ v < 3.18.*3.18.0 ≤ v < 3.18.153.19.0 ≤ v < 3.19.*3.19.0 ≤ v < 3.19.123.20.0 ≤ v < 3.20.*3.20.0 ≤ v < 3.20.83.21.0 ≤ v < 3.21.*3.21.0 ≤ v < 3.21.63.17.03.18.03.19.03.20.03.21.0
Affected range stops below 3.17.*, so it looks safe — our inference, not a vendor statement
Affected range stops below 3.17.21, so it looks safe — our inference, not a vendor statement
Affected range stops below 3.18.*, so it looks safe — our inference, not a vendor statement
Affected range stops below 3.18.15, so it looks safe — our inference, not a vendor statement
Affected range stops below 3.19.*, so it looks safe — our inference, not a vendor statement
Affected range stops below 3.19.12, so it looks safe — our inference, not a vendor statement
Affected range stops below 3.20.*, so it looks safe — our inference, not a vendor statement
Affected range stops below 3.20.8, so it looks safe — our inference, not a vendor statement
Affected range stops below 3.21.*, so it looks safe — our inference, not a vendor statement
Affected range stops below 3.21.6, so it looks safe — our inference, not a vendor statement

References (5)

Release NotesVendor Advisory
Source: cverecord
https://docs.github.com/en/[email protected]/admin/release-notes#3.17.21
Release NotesVendor Advisory
Source: cverecord
https://docs.github.com/en/[email protected]/admin/release-notes#3.18.15
Release NotesVendor Advisory
Source: cverecord
https://docs.github.com/en/[email protected]/admin/release-notes#3.19.12
Release NotesVendor Advisory
Source: cverecord
https://docs.github.com/en/[email protected]/admin/release-notes#3.20.8
Release NotesVendor Advisory
Source: cverecord
https://docs.github.com/en/[email protected]/admin/release-notes#3.21.6

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

6.5MEDIUM[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
NONE
Availability
NONE
Vector?

Quick Info

StatusANALYZED
CWE
CWE-639

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