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}`.
Problem types
CWE-116: Improper Encoding or Escaping of Output
CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Product status
< 3.5.0.beta5
< 3.5.0.beta6-dev
References
github.com/...course/security/advisories/GHSA-x8mp-chx3-6x2p