SB20250716119 - Multiple vulnerabilities in Discourse

Description

This security bulletin contains information about 2 vulnerabilities.

1) Information disclosure (CVE-ID: CVE-2025-49845)

CWE-ID: CWE-200 - Exposure of sensitive information to an unauthorized actor

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Green

The vulnerability allows a remote attacker to gain access to potentially sensitive information.

The vulnerability exists due to excessive data output by the application. A remote attacker can continue to see their own whispers even after losing visibility of posts typed "whisper".

2) Insufficient Session Expiration (CVE-ID: CVE-2025-53102)

CWE-ID: CWE-613 - Insufficient Session Expiration

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear

The vulnerability allows a remote user to reuse a previously generated WebAuthn challenge.

The vulnerability exists due to improper session management in the WebAuthn challenge handling logic when processing two-factor authentication with a physical security key. A remote user can authenticate and reuse a previously generated challenge to reuse a previously generated WebAuthn challenge.

The issue occurs after successful authentication because the challenge is not cleared from the user's session.

Remediation

Install update from vendor's website.

References

• https://github.com/discourse/discourse/security/advisories/GHSA-79qw-r73r-69gf
• https://github.com/discourse/discourse/security/advisories/GHSA-hv49-93h5-4wcv