XSS in Xenforo
CVE-2021-43032
In XenForo through 2.2.7, a threat actor with access to the admin panel can create a new Advertisement via the Advertising function, and save an XSS payload in the body of the HTML document. This payload will execute globally on the client side.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.8 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.009 (58.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 58th percentile — 58.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.009 · newest: 0.009 · change: 0.000
Affected products
Weakness classification (CWE)
Public proof-of-concept exploits
References
- xenforo.com/community/forums/announcements/ (Release Notes, Vendor Advisory)
- github.com/SakuraSamuraii/CVE-2021-43032 (Exploit, Third Party Advisory)
Frequently asked questions
- What is CVE-2021-43032?
- CVE-2021-43032 is a medium-severity vulnerability in Xenforo, classified under Cross-site Scripting. CVSS score: 4.8/10. Published 2021-11-03.
- How severe is CVE-2021-43032?
- Medium severity. CVSS v3 base score is 4.8 out of 10.
- Is CVE-2021-43032 known to be exploited?
- 3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.