JavaScript Injection Vulnerability in Discourse by Discourse
CVE-2025-22602

6.5MEDIUM

Key Information:

Vendor
Discourse
Status
Discourse
Vendor
CVE Published:
4 February 2025

Summary

Discourse is a widely used open source platform designed for community discussions. In certain versions, a vulnerability exists that allows attackers to inject arbitrary JavaScript into users' browsers through a specially crafted video placeholder HTML element. This security issue arises specifically on sites that have Content Security Policy (CSP) disabled, exposing users to potential malicious scripts. To mitigate this risk, users are strongly encouraged to upgrade to the latest version of Discourse, where this vulnerability has been patched. For those unable to perform an upgrade, enabling CSP may provide an additional layer of protection against this type of attack.

Affected Version(s)

discourse stable: <= 3.3.3 <= stable: 3.3.3

discourse beta: <= 3.4.0.beta3 <= beta: 3.4.0.beta3

discourse tests-passed: <= 3.4.0.beta3 <= tests-passed: 3.4.0.beta3

References

https://github.com/discourse/discourse/security/advisorie...
x_refsource_CONFIRM

CVSS V3.1

Score:
6.5
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
None
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.