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CVE-2025-52477

8.6 · HIGH

Octo-STS is a GitHub App that acts like a Security Token Service (STS) for the GitHub API.

Published Jun 26, 2025CWE-918EPSS 0.49%

Overview

CVE-2025-52477 is a high-severity vulnerability. It was published on June 26, 2025 and has a CVSS 3.1 base score of 8.6 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.6, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/octo-sts/app/commit/0f177fde54f9318e33f0bba6abaea9463a7c3afdGitHubgithub.com/octo-sts/app/commit/b3976e39bd8c8c217c0670747d34a4499043da92GitHubgithub.com/octo-sts/app/security/advisories/GHSA-h3qp-hwvr-9xcqGitHubgithub.com/octo-sts/app/security/advisories/GHSA-h3qp-hwvr-9xcqGitHubgithub.com/octo-sts/app/security/advisories/GHSA-h3qp-hwvr-9xcqGitHubgithub.com/octo-sts/app/security/advisories/GHSA-h3qp-hwvr-9xcq

How CyberStrike helps

Frequently asked questions

What is CVE-2025-52477?

CVE-2025-52477 is a high-severity vulnerability. It was published on June 26, 2025 and has a CVSS 3.1 base score of 8.6 (HIGH).

How severe is CVE-2025-52477?

This vulnerability has a CVSS 3.1 base score of 8.6, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2025-52477?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2025-52477?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2025-52477 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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