Discourse Cache Chaos: Anonymous Users Beware of CVE-2024-47773!

Discourse 3.2.x has a new party trick: anonymous cache poisoning! This vulnerability (CVE-2024-47773) lets attackers serve responses without preloaded data to unsuspecting visitors. It’s a bit like offering empty candy wrappers on Halloween. To avoid this spooky surprise, upgrade Discourse or disable anonymous cache.

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Published: July 8, 2025 4:57 pmAdded: July 8, 2025 at 10:34 amAssembled by: The Editor
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Hot Take:

Oh, Discourse! You’ve been caught with your cache down again. This time, it’s a vulnerability that lets anonymous users poison your cache like a bad case of food poisoning. But don’t worry, just upgrade your system or disable anonymous cache, and you’ll be back to serving fresh, untainted data in no time!

Key Points:

  • Discourse versions 3.1.x and 3.2.x are susceptible to anonymous cache poisoning.
  • The vulnerability can be exploited with multiple XHR requests.
  • Only anonymous visitors are affected, so registered users can breathe easy.
  • The exploit has been assigned CVE-2024-47773 with a CVSS score of 7.1.
  • To mitigate, upgrade Discourse or disable anonymous cache.

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