CVE-2025-61926
MediumCVSS 4.6Exploitation Probability (EPSS)
Low risk32th percentile - higher than 32% of all known CVEs
Summary
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.
Risk Assessment
The risk includes the possibility that an attacker, knowing the shared secret, can send fake webhook requests, which could lead to unauthorized changes in security policies or other actions. Since the secret is shared across all deployments, the risk is widespread.
Recommendation
It is recommended to immediately update Allstar to version 4.5 or later. If not possible, modify the source code to use a configurable secret and restrict access to the Reviewbot endpoint.
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Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS