Discourse vulnerable to incomplete quote causing a topic to crash in the browser
13Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 6.5epss 1.0%
exploitation probability
1.0%top 40% of all CVEs
observed exploitation
nono source reports it
In short
A malformed quote in Discourse can cause the web page to crash with a JavaScript error, disrupting the user's browsing experience. This affects versions 2.9.0.beta5 through 2.9.0.beta9 of the open source discussion platform.
Technical detail
CWE-20 (Improper Input Validation) vulnerability in Discourse where incomplete quote markup fails validation and triggers an unhandled JavaScript error, causing a denial of service to the affected client. The attack vector requires the ability to post or edit content containing malformed quotes; version 2.9.0.beta10+ includes input validation fixes to prevent this client-side crash.
Summary generated and translated by AI from the official description.
Discourse is an open source discussion platform. Starting with version 2.9.0.beta5 and prior to version 2.9.0.beta10, an incomplete quote can generate a JavaScript error which will crash the current page in the browser in some cases. Version 2.9.0.beta10 added a fix and tests to ensure incomplete quotes won't break the app. As a workaround, the quote can be fixed via the rails console.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Affected products
discourse · discourse