by Kastro
Paper/Archive/CVE-2025-53102

CVE-2025-53102

discourse discourse — Discourse's WebAuthn challenge isn't cleared from user session after authentication

EPSS 0.5%CVSS 9.8
critical.is priorityof 100
38
CVSS 9.8 (NVD)9.8 / 10 × 3029.4Not in CISA KEV+300.0EPSS percentile 44.0.440 × 208.8No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

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

ProductAffectedFixed inSource
discourse>= 3.5.0.beta1, < 3.5.0.beta.8–CNA
discourse< 3.4.7–CNA

Scores by source

NVD9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
GitHub_M (CNA)8.2CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
CISA ADPSSVCExploitation: none · Automatable: no · Technical impact: partial

References

refgithub.com/discourse/discourse/security/advisories/GHSA-hv49-93h5-4wcvrefgithub.com/discourse/discourse/commit/20bf65099bb861a141bc10e8a4eab65329d91802refgithub.com/discourse/discourse/commit/8bc0cee2c00a514ea60f33ea6172da2ce5a05beb