XSS in Discourse
CVE-2023-43659
Discourse is an open source platform for community discussion. Improper escaping of user input allowed for Cross-site Scripting attacks via the digest email preview UI. This issue only affects sites with CSP disabled. This issue has been patched in the 3.1.1 stable release as well as the 3.2.0.beta1 release. Users are advised to upgrade. Users unable to upgrade should ensure CSP is enabled on the forum.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.0 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.004 (33.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 34th percentile — 33.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000
Affected products
- Discourse — versions stable <= 3.1.1, beta <= 3.2.0.beta1, 3.2.0
Weakness classification (CWE)
References
- github.com/discourse/discourse/security/advisories/GHSA-g4qg-5q2h-m8ph (Vendor Advisory)
- developer.mozilla.org/en-US/docs/Web/HTTP/CSP (Third Party Advisory)
Frequently asked questions
- What is CVE-2023-43659?
- CVE-2023-43659 is a high-severity vulnerability in Discourse, classified under Cross-site Scripting. CVSS score: 8.0/10. Published 2023-10-16.
- How severe is CVE-2023-43659?
- High severity. CVSS v3 base score is 8.0 out of 10.