Vulnerability in Discourse
CVE-2021-41163
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 10.0 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.198 (97.3th percentile), scored .
Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 97th percentile — 97.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.198 · newest: 0.198 · change: 0.000
Affected products
- Discourse — versions beta < 2.8.0.beta7, tests-passed < 2.8.0.beta7, 2.8.0
Weakness classification (CWE)
Public proof-of-concept exploits
References
- github.com/discourse/discourse/security/advisories/GHSA-jcjx-pvpc-qgwq (Third Party Advisory)
- github.com/discourse/discourse/commit/fa3c46cf079d28b086fe1025349bb00223a5d5e9 (Patch, Third Party Advisory)
Frequently asked questions
- What is CVE-2021-41163?
- CVE-2021-41163 is a critical-severity vulnerability in Discourse, classified under Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection). CVSS score: 10.0/10. Published 2021-10-20.
- How severe is CVE-2021-41163?
- Critical severity. CVSS v3 base score is 10.0 out of 10.
- Is CVE-2021-41163 known to be exploited?
- 4 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.