CVEvulnerability

CVE-2026-103620

6.0 MEDIUM Published 2026-10-06 Modified 2026-10-20 Official page ↗
Status
Analyzed
Published
2026-10-06
Last modified
2026-10-20
Assigner
[email protected]
CVSS 4.0 ([email protected])
6.0 MEDIUM — CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CVSS 3.1 ([email protected])
6.5 MEDIUM — CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
Weaknesses
CWE-862

Description

A missing authorization vulnerability was identified in GitHub Enterprise Server that allowed a repository collaborator with write access to delete the current default branch through the GraphQL API and cause an attacker-controlled branch to become the new default. In repositories that required pull-request review but did not restrict branch deletion, this bypassed the review requirement and caused fresh clones and default-branch API requests to use attacker-controlled content. This vulnerability affected supported GitHub Enterprise Server releases in the 3.18, 3.19, 3.20, 3.21, and 3.22 series and was fixed in versions 3.18.16, 3.19.13, 3.20.9, 3.21.7, and 3.22.2. This vulnerability was reported via the GitHub Bug Bounty program.

Affected configurations

• github enterprise server (>= 3.18.0 < 3.18.16) • github enterprise server (>= 3.19.0 < 3.19.13) • github enterprise server (>= 3.20.0 < 3.20.9) • github enterprise server (>= 3.21.0 < 3.21.7) • github enterprise server (>= 3.22.0 < 3.22.2)

Related

Weakness · CWE (1)

  • CWE-862 Missing Authorization weakness

References