CVE-2025-48954

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

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.

Category

8.1
CVSS
Severity: High
CVSS 3.1 •
EPSS 0.03%
Affected: discourse discourse
Published at:
Updated at:

References

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

Frequently Asked Questions

What is the severity of CVE-2025-48954?
CVE-2025-48954 has been scored as a high severity vulnerability.
How to fix CVE-2025-48954?
To fix CVE-2025-48954, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2025-48954 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2025-48954 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2025-48954?
CVE-2025-48954 affects discourse discourse.
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