Allstar is a GitHub App to set and enforce security policies. In versions prior to 4.5, a vulnerability in Allstar’s Reviewbot component caused inbound webhook requests to be validated against a hard-coded, shared secret. The value used for the secret token was compiled into the Allstar binary and could not be configured at runtime. In practice, this meant that every deployment using Reviewbot would validate requests with the same secret unless the operator modified source code and rebuilt the component - an expectation that is not documented and is easy to miss. All Allstar releases prior to v4.5 that include the Reviewbot code path are affected. Deployments on v4.5 and later are not affected. Those who have not enabled or exposed the Reviewbot endpoint are not exposed to this issue.
History

Thu, 16 Oct 2025 19:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Fri, 10 Oct 2025 11:30:00 +0000

Type Values Removed Values Added
First Time appeared Allstar
Allstar reviewbot
Vendors & Products Allstar
Allstar reviewbot

Thu, 09 Oct 2025 21:30:00 +0000

Type Values Removed Values Added
Description Allstar is a GitHub App to set and enforce security policies. In versions prior to 4.5, a vulnerability in Allstar’s Reviewbot component caused inbound webhook requests to be validated against a hard-coded, shared secret. The value used for the secret token was compiled into the Allstar binary and could not be configured at runtime. In practice, this meant that every deployment using Reviewbot would validate requests with the same secret unless the operator modified source code and rebuilt the component - an expectation that is not documented and is easy to miss. All Allstar releases prior to v4.5 that include the Reviewbot code path are affected. Deployments on v4.5 and later are not affected. Those who have not enabled or exposed the Reviewbot endpoint are not exposed to this issue.
Title Allstar Reviewbot has Authentication Bypass via Hard-coded Webhook Secret
Weaknesses CWE-453
CWE-798
References
Metrics cvssV4_0

{'score': 4.6, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:U'}


cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published: 2025-10-09T21:20:32.670Z

Updated: 2025-10-16T18:13:02.504Z

Reserved: 2025-10-03T22:21:59.616Z

Link: CVE-2025-61926

cve-icon Vulnrichment

Updated: 2025-10-16T18:12:42.466Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2025-10-09T22:15:32.630

Modified: 2025-10-16T18:15:39.300

Link: CVE-2025-61926

cve-icon Redhat

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