Anonymous user cache poisoning via maliciously formed request
Package
Discourse
(Discourse)
Affected versions
stable <= 2.8.2; beta <= 2.9.0.beta3; tests-passed <= 2.9.0.beta3
Patched versions
stable >= 2.8.3; beta >= 2.9.0.beta4; tests-passed >= 2.9.0.beta4
Impact
An attacker can poison the cache for anonymous (i.e. not logged in) users, such that the users are shown the crawler view of the site instead of the HTML page. This can lead to a partial denial-of-service.
Patches
This issue is patched in the latest stable, beta and tests-passed versions of Discourse.