Description
XWiki Rendering is a generic rendering system that converts textual input in a given syntax (wiki syntax, HTML, etc) into another syntax (XHTML, etc). Versions 16.10.9 and below, 17.0.0-rc-1 through 17.4.2 and 17.5.0-rc-1 through 17.5.0 have insufficient protection against {{/html}} injection, which attackers can exploit through RCE. Any user who can edit their own profile or any other document can execute arbitrary script macros, including Groovy and Python macros, which enable remote code execution as well as unrestricted read and write access to all wiki contents. This issue is fixed in versions 16.10.10, 17.4.3 and 17.6.0-rc-1.
Affected products
xwiki: xwiki-rendering
References10
- github.com/xwiki/xwiki-rendering/security/advisories/GHSA-9xc6-… PatchVendor Advisory
- jira.xwiki.org/browse/XRENDERING-693 ExploitPatchVendor Advisory
- jira.xwiki.org/browse/XRENDERING-792 ExploitPatchVendor Advisory
- jira.xwiki.org/browse/XRENDERING-793 ExploitPatchVendor Advisory
- jira.xwiki.org/browse/XWIKI-23378 PatchVendor Advisory
- jira.xwiki.org/browse/XRENDERING-693 ExploitPatchVendor Advisory
- jira.xwiki.org/browse/XRENDERING-792 ExploitPatchVendor Advisory
- jira.xwiki.org/browse/XRENDERING-793 ExploitPatchVendor Advisory
- github.com/xwiki/xwiki-platform/commit/12b780ccd5bca5fc8f74f466… Patch
- github.com/xwiki/xwiki-rendering/commit/9b71a2ee035815cfc29cebb… Patch
Metrics
- CVSS 3.1
-
8.8
HIGH
Score source: NVD
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H - CVSS 4.0
-
8.7
HIGH
Score source: CNA
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X - EPSS — exploit probability
- 1% percentile: 66 · as of 11 November 2026
- CWE
- CWE-95CWE-94
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.