CVE-2025-48954

Discourse vulnerable to XSS via user-provided query parameter in oauth failure flow

State: Published
Severity: 8.1 High
Published: Jun 25, 2025
Updated: Jun 25, 2025
Reserved: May 28, 2025

Description

Discourse is an open-source discussion platform. Versions prior to 3.5.0.beta6 are vulnerable to cross-site scripting when the content security policy isn't enabled when using social logins. Version 3.5.0.beta6 patches the issue. As a workaround, have the content security policy enabled.

Scores

CVSS	Score	Vector	Source
3.1	8.1 High	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N	GitHub_M

Weaknesses

CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Affected Products

Product	Versions
discoursediscourse	< 3.5.0.beta6Affected

References

https://github.com/discourse/discourse/security/advisories/GHSA-26p5-mjjh-wfcf

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