CVE-2021-43794

Anonymous user cache poisoning via development-mode header in Discourse

Description

Discourse is an open source discussion platform. In affected versions an attacker can poison the cache for anonymous (i.e. not logged in) users, such that the users are shown a JSON blob instead of the HTML page. This can lead to a partial denial-of-service. This issue is patched in the latest stable, beta and tests-passed versions of Discourse.

References

Link	Tags
https://github.com/discourse/discourse/commit/2da0001965c6d8632d723c46ea5df9f22a1a23f1	third party advisory patch
https://github.com/discourse/discourse/security/advisories/GHSA-249g-pc77-65hp	third party advisory

Frequently Asked Questions

What is the severity of CVE-2021-43794?: CVE-2021-43794 has been scored as a medium severity vulnerability.
How to fix CVE-2021-43794?: To fix CVE-2021-43794, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2021-43794 being actively exploited in the wild?: As for now, there are no information to confirm that CVE-2021-43794 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2021-43794?: CVE-2021-43794 affects discourse discourse.

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Description

Category

CWE-610 – Externally Controlled Reference to a Resource in Another Sphere

References

Frequently Asked Questions