XSS in Xwiki
CVE-2023-29201
XWiki Commons are technical libraries common to several other top level XWiki projects. The "restricted" mode of the HTML cleaner in XWiki, introduced in version 4.2-milestone-1, only escaped `<script>` and `<style>`-tags but neither attributes that can be used to inject scripts nor other dangerous HTML tags like `<iframe>`. As a consequence, any code relying on this "restricted" mode for security is vulnerable to JavaScript injection ("cross-site scripting"/XSS). When a privileged user with programming rights visits such a comment in XWiki, the malicious JavaScript code is executed in the context of the user session. This allows server-side code execution with programming rights, impacting the confidentiality, integrity and availability of the XWiki instance. This problem has been patched in XWiki 14.6 RC1 with the introduction of a filter with allowed HTML elements and attributes that is enabled in restricted mode. There are no known workarounds apart from upgrading to a version including the fix.
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: 0.012 (66.5th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 66th percentile — 66.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.012 · newest: 0.012 · change: 0.000
Affected products
- Xwiki
- Xwiki Xwiki-Commons — versions >= 4.2-milestone-1, < 14.6-rc-1
Weakness classification (CWE)
Public proof-of-concept exploits
References
- github.com/xwiki/xwiki-commons/security/advisories/GHSA-m3jr-cvhj-f35j (Exploit, Patch, Vendor Advisory)
- github.com/xwiki/xwiki-commons/commit/4a185e0594d90cd4916d60aa60bb4333dc5623b2 (Patch)
- github.com/xwiki/xwiki-commons/commit/b11eae9d82cb53f32962056b5faa73f3720c6182 (Patch)
- jira.xwiki.org/browse/XCOMMONS-1680 (Exploit, Issue Tracking)
- jira.xwiki.org/browse/XCOMMONS-2426 (Exploit, Issue Tracking)
- jira.xwiki.org/browse/XWIKI-9118 (Exploit, Issue Tracking)
Frequently asked questions
- What is CVE-2023-29201?
- CVE-2023-29201 is a critical-severity vulnerability in Xwiki, classified under Cross-site Scripting. CVSS score: 9.0/10. Published 2023-04-15.
- How severe is CVE-2023-29201?
- Critical severity. CVSS v3 base score is 9.0 out of 10.
- Is CVE-2023-29201 known to be exploited?
- 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.