CVE-2025-52477 HIGH

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

Vendor Octo-Sts
Product app
Weakness CWE-918 · SSRF
Published June 26, 2025
Last update June 27, 2025
View on NVD All CVEs

CVSS base score

8.6/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Confidentiality High
Integrity None

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

June 26, 2025 CVE published
June 27, 2025 Record updated