Vulnerability · Published Jul 29, 2025 · Assigned by GitHub_M

CVE-2025-53102Discourse's WebAuthn challenge isn't cleared from user session after authentication

High 8.2

In plain English

A high-severity session fixation in discourse from discourse. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 44% of all known vulnerabilities).

Severity (CVSS 4.0)8.2High

Exploit odds (30 days)0.5%top 55.9% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

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.

Affected products (as reported)

Vendor	Product	Versions
discourse	discourse	>= 3.5.0.beta1, < 3.5.0.beta.8< 3.4.7

Weakness: CWE-384 · Vector: CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

References

https://github.com/discourse/discourse/security/advisories/GHSA-hv49-93h5-4wcv x_refsource_CONFIRM
https://github.com/discourse/discourse/commit/20bf65099bb861a141bc10e8a4eab65329d91802 x_refsource_MISC
https://github.com/discourse/discourse/commit/8bc0cee2c00a514ea60f33ea6172da2ce5a05beb x_refsource_MISC