CVE-2021-41163

Name: CVE-2021-41163
Creator: NVD / NIST
Published: 2021-10-20T23:15:07.477+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 19.81%

Last modified Jun 17, 2026

CVE-2021-41163 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. Discourse is an open source platform for community discussion. In affected versions maliciously crafted requests could lead to remote code execution. EPSS estimates a 19.81% chance of exploitation in the next 30 days.

Description

Discourse is an open source platform for community discussion. In affected versions maliciously crafted requests could lead to remote code execution. This resulted from a lack of validation in subscribe_url values. This issue is patched in the latest stable, beta and tests-passed versions of Discourse. To workaround the issue without updating, requests with a path starting /webhooks/aws path could be blocked at an upstream proxy.

Metrics

CVSS 3.1

9.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

19.81%

97.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions	Update
Discourse	Discourse	< 2.7.9	—
Discourse	Discourse	2.8.0	Beta1

References

https://github.com/discourse/discourse/commit/fa3c46cf079d28b086fe1025349bb00223a5d5e9Patch, Third Party Advisory
https://github.com/discourse/discourse/security/advisories/GHSA-jcjx-pvpc-qgwqThird Party Advisory
https://github.com/discourse/discourse/commit/fa3c46cf079d28b086fe1025349bb00223a5d5e9Patch, Third Party Advisory
https://github.com/discourse/discourse/security/advisories/GHSA-jcjx-pvpc-qgwqThird Party Advisory

Timeline

Published: Oct 20, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-41163?

How severe is CVE-2021-41163?

CVE-2021-41163 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 19.81% probability of exploitation in the next 30 days.

How do I fix CVE-2021-41163?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-41163?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST