XSS in Flarum
CVE-2022-41938
Flarum is an open source discussion platform. Flarum's page title system allowed for page titles to be converted into HTML DOM nodes when pages were rendered. The change was made after `v1.5` and was not noticed. This allowed an attacker to inject malicious HTML markup using a discussion title input, either by creating a new discussion or renaming one. The XSS attack occurs after a visitor opens the relevant discussion page. All communities running Flarum from `v1.5.0` to `v1.6.1` are impacted. The vulnerability has been fixed and published as flarum/core `v1.6.2`. All communities running Flarum from `v1.5.0` to `v1.6.1` have to upgrade as soon as possible to v1.6.2. There are no known workarounds for this issue.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.0 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.007 (52.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 53rd percentile — 52.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: +0.000
Affected products
- Flarum
- Flarum Framework — versions >= 1.5.0, < 1.6.2
Weakness classification (CWE)
References
- github.com/flarum/framework/security/advisories/GHSA-7x4w-j98p-854x (Third Party Advisory)
- github.com/flarum/framework/commit/690de9ce0ffe7ac4d45b73e303f44340c3433138 (Patch, Third Party Advisory)
- discuss.flarum.org/d/27558 (Vendor Advisory)
Frequently asked questions
- What is CVE-2022-41938?
- CVE-2022-41938 is a critical-severity vulnerability in Flarum, classified under Cross-site Scripting. CVSS score: 9.0/10. Published 2022-11-19.
- How severe is CVE-2022-41938?
- Critical severity. CVSS v3 base score is 9.0 out of 10.