CVE-2025-53102 Discourse's WebAuthn challenge isn't cleared from user session after authentication
Attackers can reuse WebAuthn challenges to bypass two-factor authentication controls in Discourse forums.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2025-53102?
CVE-2025-53102 is a high-severity vulnerability in Discourse Discourse, published on 29 Jul 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
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.
Weakness: CWE-384
Which versions are affected by CVE-2025-53102?
1 open source package ship an affected version, including discourse. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
discourse Bitnami | All versions | 3.4.7 |
Products include Discourse Discourse.
How do I fix CVE-2025-53102?
Upgrade discourse to 3.4.7 or later.
Is CVE-2025-53102 being exploited?
There is no known exploitation of CVE-2025-53102 in the wild and no public exploit code.
Other vulnerabilities in Discourse Discourse
- CVE-2021-41163 RCE via malicious SNS subscription payload
- CVE-2022-36066 Discourse vulnerable to RCE via admins uploading maliciously zipped file
- CVE-2022-39356 Discourse user account takeover via email and invite link
- CVE-2023-22468 Discourse vulnerable to Cross-site Scripting in local oneboxes
- CVE-2026-27934 Discourse leaks private topic title and post excerpt via user action API endpoint
Sources
Also known as BIT-discourse-2025-53102, GHSA-hv49-93h5-4wcv.