---
title: "CVE-2026-23734: XWiki Platform has path traversal via resources parameter in ssx and jsx endpoints when using leading slash"
url: https://erroneo.us/security/cve/CVE-2026-23734/
description: "CVE-2026-23734 (org.xwiki.commons:xwiki-commons-classloader-api (Maven)): XWiki Platform is a generic wiki platform. Versions prior to 18.1.0-rc-1, 17.10.3…"
type: vulnerability-record
section: "Security Digest"
date_published: 2026-05-20
date_modified: 2026-05-26
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2026-23734"
kev: false
cvss: 9.3
epss: 0.18528
license: All rights reserved. Quote with attribution and a link.
---

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

**Signal:** High exploit likelihood. EPSS ranks it in the top 5% of all CVEs for likely exploitation in the next 30 days. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- 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.

## Affected packages

- Maven `org.xwiki.commons:xwiki-commons-classloader-api` >= 4.2-milestone-2, < 16.10.17 → fixed: 16.10.17
- Maven `org.xwiki.commons:xwiki-commons-classloader-api` >= 17.0.0-rc-1, < 17.4.9 → fixed: 17.4.9
- Maven `org.xwiki.commons:xwiki-commons-classloader-api` >= 17.5.0, < 17.10.3 → fixed: 17.10.3
- Maven `org.xwiki.commons:xwiki-commons-classloader-api` >= 18.0.0-rc-1, < 18.1.0-rc-1 → fixed: 18.1.0-rc-1

## Affected products (CVE record)

- xwiki xwiki-commons: >= 4.2-milestone-2, < 16.10.17, >= 17.0.0-rc-1, < 17.4.9, >= 17.5.0, < 17.10.3, >= 18.0.0-rc-1, < 18.1.0-rc-1

## Severity

- GitHub_M CVSS 4.0: 9.3 `CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N`
- GitHub CVSS 4.0: 9.3 `CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N`

## Exploitation

- 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.

## Sources

- [GitHub Advisory GHSA-xq3r-2qv5-vqqm](https://github.com/advisories/GHSA-xq3r-2qv5-vqqm)
- [CVE.org record CVE-2026-23734](https://www.cve.org/CVERecord?id=CVE-2026-23734)
- [NVD entry CVE-2026-23734](https://nvd.nist.gov/vuln/detail/CVE-2026-23734)
- [github.com](https://github.com/xwiki/xwiki-commons/security/advisories/GHSA-xq3r-2qv5-vqqm)
- [github.com](https://github.com/xwiki/xwiki-commons/commit/a979cafd89f6a9c9c0b9ab19744d672df64429bf)
- [jira.xwiki.org](https://jira.xwiki.org/browse/XCOMMONS-3547)

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Source page: https://erroneo.us/security/cve/CVE-2026-23734/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt