What’s Vulnerable › Vulnerabilities

CVE-2025-52477: Octo-STS Vulnerable to Unauthenticated SSRF with HTTP Response Reflection in OIDC Flow

• Severity: high (CVSS 8.6 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-06-26 · updated 2026-06-17
• Weakness: CWE-918

Description

Octo-STS is a GitHub App that acts like a Security Token Service (STS) for the GitHub API. Octo-STS versions before v0.5.3 are vulnerable to unauthenticated SSRF by abusing fields in OpenID Connect tokens. Malicious tokens were shown to trigger internal network requests which could reflect error logs with sensitive information. Upgrade to v0.5.3 to resolve this issue. This version includes patch sets to sanitize input and redact logging.

Affected products

• octo-sts app: before 0.5.3

References

• https://github.com/octo-sts/app/commit/0f177fde54f9318e33f0bba6abaea9463a7c3afd
• https://github.com/octo-sts/app/commit/b3976e39bd8c8c217c0670747d34a4499043da92
• https://github.com/octo-sts/app/security/advisories/GHSA-h3qp-hwvr-9xcq
• https://github.com/octo-sts/app/security/advisories/GHSA-h3qp-hwvr-9xcq
• https://github.com/octo-sts/app/security/advisories/GHSA-h3qp-hwvr-9xcq
• https://github.com/octo-sts/app/security/advisories/GHSA-h3qp-hwvr-9xcq

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