Vulnerability in Discourse
CVE-2025-53102
Discourse is an open-source community discussion platform. Prior to version 3.4.7 on the `stable` branch and version 3.5.0.beta.8 on the `tests-passed` branch, upon issuing a physical security key for 2FA, the server generates a WebAuthn challenge, which the client signs. The challenge is not cleared from the user’s session after authentication, potentially allowing reuse and increasing security risk. This is fixed in versions 3.4.7 and 3.5.0.beta.8.
EPSS: 0.005 (36.9th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
Affected products
- Discourse — versions >= 3.5.0.beta1, < 3.5.0.beta.8, 3.5.0, < 3.4.7
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM, Third Party Advisory)
- security-advisories@github.com (Patch, x_refsource_MISC)
- security-advisories@github.com (Patch, x_refsource_MISC)
Frequently asked questions
- What is CVE-2025-53102?
- CVE-2025-53102 is a critical-severity vulnerability in Discourse, classified under Session Fixation. CVSS score: 9.8/10. Published 2025-07-29.
- How severe is CVE-2025-53102?
- Critical severity. CVSS v3 base score is 9.8 out of 10.