CVE-2026-23734: XWiki Platform has path traversal via resources parameter in ssx and jsx endpoints when using leading slash

Should you act?

High exploit likelihood

EPSS ranks it in the top 5% of all CVEs for likely exploitation in the next 30 days. This signal is computed from CISA KEV, EPSS and CVSS data; it is not an editorial verdict.

• No confirmed exploitation. It is not in CISA’s KEV catalog and CISA’s SSVC assessment records no known exploitation. That can change quickly after a public write-up; re-check if you are affected.
• EPSS 18.5%, percentile 97: FIRST’s model estimates a 18.5% chance of exploitation activity in the next 30 days, higher than 97% of all scored CVEs (very high). EPSS is a probability, not a verdict.
• Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.
• Only applies if your dependency tree includes org.xwiki.commons:xwiki-commons-classloader-api (Maven) >= 4.2-milestone-2, < 16.10.17, fixed in 16.10.17; org.xwiki.commons:xwiki-commons-classloader-api (Maven) >= 17.0.0-rc-1, < 17.4.9, fixed in 17.4.9; org.xwiki.commons:xwiki-commons-classloader-api (Maven) >= 17.5.0, < 17.10.3, fixed in 17.10.3; org.xwiki.commons:xwiki-commons-classloader-api (Maven) >= 18.0.0-rc-1, < 18.1.0-rc-1, fixed in 18.1.0-rc-1. Check your lockfile, including transitive dependencies.

What it is

XWiki Platform is a generic wiki platform. Versions prior to 18.1.0-rc-1, 17.10.3, 17.4.9, and 16.10.17 allow access to read configuration files by using URLs such as http://localhost:8080/bin/ssx/Main/WebHome?resource=/../../WEB-INF/xwiki.cfg&minify=false, leading to Path Traversal. The vulnerability is can be exploited via resources parameter the ssx and jsx endpoints by using leading slashes. This issue has been patched in 18.1.0-rc-1, 17.10.3, 17.4.9, 16.10.17.

From the GitHub advisory

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.

Weakness type: CWE-23.

Product: org.xwiki.commons:xwiki-commons-classloader-api (Maven) · Assigned by: GitHub_M · Published: 2026-05-20

Affected and fixed versions

Severity scores

• Attack vector: network (remotely reachable)
• Attack complexity: low
• Attack requirements: none
• Privileges required: none (no login)
• User interaction: none

CVSS measures how bad a flaw is if exploited, not how likely exploitation is. Read it next to the exploitation data below.

Exploitation and urgency

• CISA KEV: not listed (no confirmed in-the-wild exploitation known to CISA).
• CISA SSVC assessment: exploitation none, automatable yes, technical impact partial.
• FIRST EPSS (model of 2026-10-21): 18.53% probability of exploitation activity in the next 30 days; percentile 97.

Timeline

• 2026-05-20 — CVE record published by GitHub_M
• 2026-05-26 — CVE record last updated
• 2026-05-26 — GitHub-reviewed advisory GHSA-xq3r-2qv5-vqqm published (critical)

Sources and references

Original sources first. Version and fix details should always be confirmed against the vendor or project advisory.

Vulnerability records

1. GitHub Advisory GHSA-xq3r-2qv5-vqqm github.com
2. CVE.org record CVE-2026-23734 cve.org
3. NVD entry CVE-2026-23734 nvd.nist.gov

Other references from the CVE record and advisory

1. github.com github.com
2. github.com github.com
3. jira.xwiki.org jira.xwiki.org

Critical Maven advisories · Today’s Security Digest