CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N
Lifecycle Timeline
3Tags
Description
Discourse is an open-source discussion platform. Prior to version 3.4.4 of the `stable` branch, version 3.5.0.beta5 of the `beta` branch, and version 3.5.0.beta6-dev of the `tests-passed` branch, certain invites via email may result in HTML injection in the email body if the topic title includes HTML. This includes inviting someone (without an account) to a PM and inviting someone (without an account) to a topic with a custom message. This issue is patched in version 3.4.4 of the `stable` branch, version 3.5.0.beta5 of the `beta` branch, and version 3.5.0.beta6-dev of the `tests-passed` branch. This can be worked around if the relevant templates are overridden without `{topic_title}`.
Analysis
A remote code execution vulnerability in Discourse (CVSS 7.1). High severity vulnerability requiring prompt remediation.
Technical Context
CWE-79 (Cross-site Scripting). CVSS 7.1 indicates high severity. Affects Discourse.
Affected Products
['Discourse']
Remediation
Monitor vendor channels for patch availability.
Priority Score
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External POC / Exploit Code
Leaving vuln.today
EUVD-2025-17465