Vulnerability · Published Apr 22, 2026 · Assigned by VulnCheck
CVE-2026-34415Xerte Online Toolkits File Upload RCE via elfinder Connector
Critical 9.8
In plain English
A critical-severity security flaw in xerteonlinetoolkits from thexerteproject. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 3.6% (higher than 89% of all known vulnerabilities). Ready-made attack tooling exists: Metasploit.
Official description
Xerte Online Toolkits versions 3.15 and earlier contain an incomplete input validation vulnerability in the elFinder connector endpoint that fails to block PHP-executable extensions .php4 due to an incorrect regex pattern. Unauthenticated attackers can exploit this flaw combined with authentication bypass and path traversal vulnerabilities to upload malicious PHP code, rename it with a .php4 extension, and execute arbitrary operating system commands on the server.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| thexerteproject | xerteonlinetoolkits | 0 – through 3.15.0 |
Weakness: CWE-184 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
References
- https://github.com/bootstrapbool/xerteonlinetoolkits-rce technical-description, exploit
- https://xerte.org.uk/xertetoolkits_3.15_ChangeLog.html release-notes
- https://xerte.org.uk/index.php/en/downloads-1/category/3-xerte-online-toolkits product, permissions-required
- https://github.com/thexerteproject/xerteonlinetoolkits/issues/1527 issue-tracking
- https://github.com/thexerteproject/xerteonlinetoolkits/commit/02661be88cc369325ea01b508086bde7fbfec805 patch
- https://github.com/thexerteproject/xerteonlinetoolkits/commit/17e4f945fe6a3400fa88c01eda18c1075ee4a212 patch
- https://github.com/thexerteproject/xerteonlinetoolkits/commit/507d55c5e91bf9310b5b1c7fad8aebfef902ad23 patch
- https://www.vulncheck.com/advisories/xerte-online-toolkits-file-upload-rce-via-elfinder-connector third-party-advisory