CVE-2026-23734

Description

### Impact It's possible to get access and read configuration files by using URLs such as `http://localhost:8080/bin/ssx/Main/WebHome?resource=/../../WEB-INF/xwiki.cfg&minify=false`. This can apparently be reproduced on Tomcat instances. ### Patches This has been patched in 18.0.0-rc-1, 17.10.3, 17.4.9, 16.10.17. ### Workarounds There is no known workaround, other than upgrading XWiki. ### References * https://jira.xwiki.org/browse/XCOMMONS-3547 * https://github.com/xwiki/xwiki-commons/commit/a979cafd89f6a9c9c0b9ab19744d672df64429bf ### For more information If you have any questions or comments about this advisory: * Open an issue in [Jira XWiki.org](https://jira.xwiki.org/) * Email us at [Security Mailing List](mailto:security@xwiki.org) ### Attribution The vulnerability was reported by Michał Kołek.

How to fix CVE-2026-23734

To remediate CVE-2026-23734, upgrade the affected package to a fixed version below.

• —upgrade to 16.10.17 or later

Is CVE-2026-23734 being exploited?

Moderate — EPSS is 19.5%. Track this CVE but it's not at the top of the prioritisation list.

Affected packages (1)

• >= 4.2-milestone-2, < 16.10.17

CVSS scores

References (5)

• ADVISORYnvd.nist.gov/vuln/detail/CVE-2026-23734
• PATCHgithub.com/xwiki/xwiki-commons
• WEBgithub.com/xwiki/xwiki-commons/commit/a979cafd89f6a9c9c0b9ab19744d672df64429bf
• WEBgithub.com/xwiki/xwiki-commons/security/advisories/GHSA-xq3r-2qv5-vqqm