What is CVE-2025-52477?

CVE-2025-52477 is a high-severity vulnerability in Octo-sts App, classified under Server-Side Request Forgery (SSRF). CVSS score: 8.6/10. Published 2025-06-26.

How severe is CVE-2025-52477?

High severity. CVSS v3 base score is 8.6 out of 10.

SSRF in Octo-sts App

CVE-2025-52477

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 tr…

Vulnerability class: SSRF (Server-Side Request Forgery)

EPSS: 0.004 (32.7th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.6 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N.

Affected products

Octo-sts App — versions < 0.5.3

Weakness classification (CWE)

CWE-918 — Server-Side Request Forgery (SSRF)

References

security-advisories@github.com (x_refsource_CONFIRM)
security-advisories@github.com (x_refsource_MISC)
security-advisories@github.com (x_refsource_MISC)

Frequently asked questions

What is CVE-2025-52477?: CVE-2025-52477 is a high-severity vulnerability in Octo-sts App, classified under Server-Side Request Forgery (SSRF). CVSS score: 8.6/10. Published 2025-06-26.
How severe is CVE-2025-52477?: High severity. CVSS v3 base score is 8.6 out of 10.