CVE-2026-105770
MediumCVSS 5.3Summary
Octo STS (github.com/octo-sts/app) before 0.11.2 returns trust policy configuration to callers whose OIDC token does not satisfy that policy. TrustPolicy.CheckToken included the policy's issuer, subject and audience values or patterns and claim_pattern names and regular expressions in its PermissionDenied errors, which Exchange returned verbatim. Exchange also selected the GitHub App installation before checking the token, so errors from resolving the policy's app or app_pattern pin were returned to callers the policy does not trust.
Risk Assessment
An attacker holding any validly signed OIDC token (e.g., a GitHub Actions token from a repository they own) can read the policy's matching rules, which often name internal repositories, branches, environments or cloud account identifiers. This information leak aids reconnaissance and further attacks, although it does not allow minting tokens or bypassing a trust policy.
Recommendation
Update Octo STS to version 0.11.2 or later. Review whether any exposed policy rules require rotation or hardening if they may have leaked.
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Original NVD description (English source)
Octo STS (github.com/octo-sts/app) before 0.11.2 returns trust policy configuration to callers whose OIDC token does not satisfy that policy. TrustPolicy.CheckToken included the policy's issuer, subject and audience values or patterns and claim_pattern names and regular expressions in its PermissionDenied errors, which Exchange returned verbatim. Exchange also selected the GitHub App installation before checking the token, so errors from resolving the policy's app or app_pattern pin were returned to callers the policy does not trust. An attacker who holds any validly signed OIDC token, such as a GitHub Actions token from a repository they own, and who knows or guesses a target owner/repo and identity name can read that policy's matching rules, even when the policy is stored in a private repository. These rules often name internal repositories, branches, environments or cloud account identifiers. The issue does not allow minting tokens or bypassing a trust policy. This issue is fixed in 0.11.2.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS