A vulnerability classified as problematic has been found in Discourse 3.1.0.beta2. This affects an unknown code of the component Chat Message Handler. The manipulation with an unknown input leads to a cross site scripting vulnerability. CWE is classifying the issue as CWE-79. The software does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. This is going to have an impact on integrity. The summary by CVE is:

Discourse is an open-source discussion platform. Between versions 3.1.0.beta2 and 3.1.0.beta3 of the `tests-passed` branch, editing or responding to a chat message containing malicious content could lead to a cross-site scripting attack. This issue is patched in version 3.1.0.beta3 of the `tests-passed` branch. There are no known workarounds.

The weakness was presented 03/18/2023 as GHSA-ccfc-qpmp-gq87. The advisory is shared at github.com. This vulnerability is uniquely identified as CVE-2023-26040 since 02/17/2023. It demands that the victim is doing some kind of user interaction. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1059.007 for this issue.

Upgrading to version 3.1.0.beta3 eliminates this vulnerability. Applying the patch a373bf2a01488c206e7feb28a9d2361b22ce6e70 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

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• open-source

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