CVE-2021-41271 Cache poisoning via maliciously-formed request in discourse
Attackers can poison intermediate proxy caches with error responses, leading to potential confidentiality loss of content in Discourse forums.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2021-41271?
CVE-2021-41271 is a medium-severity vulnerability in Discourse Discourse, published on 15 Nov 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Discourse is a platform for community discussion. In affected versions a maliciously crafted request could cause an error response to be cached by intermediate proxies. This could cause a loss of confidentiality for some content. This issue is patched in the latest stable, beta and tests-passed versions of Discourse.
Weakness: CWE-200
Which versions are affected by CVE-2021-41271?
1 open source package ship an affected version, including discourse. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
discourse Bitnami | All versions to 2.7.9 | None |
Products include Discourse Discourse.
How do I fix CVE-2021-41271?
No fix has been published for CVE-2021-41271 yet. Limit exposure of the affected software until one is available.
Is CVE-2021-41271 being exploited?
There is no known exploitation of CVE-2021-41271 in the wild and no public exploit code.
Other vulnerabilities in Discourse Discourse
- CVE-2021-41163 RCE via malicious SNS subscription payload
- CVE-2022-36066 Discourse vulnerable to RCE via admins uploading maliciously zipped file
- CVE-2022-39356 Discourse user account takeover via email and invite link
- CVE-2023-22468 Discourse vulnerable to Cross-site Scripting in local oneboxes
- CVE-2026-27934 Discourse leaks private topic title and post excerpt via user action API endpoint
Sources
Also known as BIT-discourse-2021-41271, GHSA-hf6r-mc9j-hf4p.