CVE-2025-48954

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

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.

Affected

discourse

CVSS v3.1 NVD

6.1 MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

CVSS v3.1 GITHUB

8.1 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N

EPSS

0.74% chance of exploitation in the next 30 days, 54th percentile

Nuclei

high · CWE-79

Published

2025-06-25

Nuclei templates (1)

• projectdiscovery/nuclei-templates/blob/main/http/cves/2025/CVE-2025-48954.yaml

Security advisories

• discourse/discourse/security/advisories/GHSA-26p5-mjjh-wfcf

References

• CVE Record
• NVD entry