CVE-2021-41163 in the critical feed json
RCE via malicious SNS subscription payload
published 2021-10-20 5 y ago modified 2026-09-08 2 mo ago also BIT-discourse-2021-41163 , EUVD-2021-28273 , GHSA-jcjx-pvpc-qgwq
- cvss
- 10.0
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 19.8%
- EPSS 19.8% chance of exploitation in 30 days, percentile 97%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
Exploit prediction
19.81% chance of exploitation in the next 30 days, higher than 97% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 10.0 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H |
| NVD | 3.1 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| NVD | 2.0 | 7.5 | AV:N/AC:L/Au:N/C:P/I:P/A:P |
| OSV | 3.1 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| bitnami | discourse | <2.7.9 |
2.7.9 |
Affected products
- discourse discourse
Classification
- Weakness
-
- CWE-74 Improper Neutralization of Special Elements in Output Used by a Downstream Component
References
-
github.com
/discourse/discourse/commit/fa3c46cf079d28b086fe1025349bb00223a5d5e9
patch, third-party-advisory, advisory
-
github.com
/discourse/discourse/security/advisories/GHSA-jcjx-pvpc-qgwq
third-party-advisory, advisory
-
nvd.nist.gov
/vuln/detail/CVE-2021-41163
web
Sources
- CVE List CVE-2021-41163
- NVD CVE-2021-41163
- OSV BIT-discourse-2021-41163
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