What is CVE-2025-22602?

CVE-2025-22602 is a medium-severity vulnerability in Discourse, classified under Cross-site Scripting. CVSS score: 6.5/10. Published 2025-02-04.

How severe is CVE-2025-22602?

Medium severity. CVSS v3 base score is 6.5 out of 10.

XSS in Discourse

CVE-2025-22602

Discourse is an open source platform for community discussion. In affected versions an attacker can execute arbitrary JavaScript on users' browsers by posting a malicious video placeholder html element. This issue only affects sites with CSP disabled. This problem has been patched in the latest version of Discourse. Users are advised to upgrade. Users unable to upgrade should enable CSP.

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.003 (27.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L.

Affected products

Discourse — versions stable: <= 3.3.3, beta: <= 3.4.0.beta3, 3.4.0

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

security-advisories@github.com (x_refsource_CONFIRM, Third Party Advisory)

Frequently asked questions

What is CVE-2025-22602?: CVE-2025-22602 is a medium-severity vulnerability in Discourse, classified under Cross-site Scripting. CVSS score: 6.5/10. Published 2025-02-04.
How severe is CVE-2025-22602?: Medium severity. CVSS v3 base score is 6.5 out of 10.