CVE-2026-34415

Xerte Online Toolkits File Upload RCE via elfinder Connector

State: Published
Severity: 9.3 Critical
Published: Apr 22, 2026
Updated: Jul 14, 2026
Reserved: Mar 27, 2026

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.

Scores

CVSS	Score	Vector	Source
4.0	9.3 Critical	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	VulnCheck
3.1	9.8 Critical	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H	VulnCheck

Weaknesses

CWE-184 Incomplete List of Disallowed Inputs

Affected Products

Product	Versions
xerteonlinetoolkitsthexerteproject	3.15.0 and earlierAffected

References

https://github.com/bootstrapbool/xerteonlinetoolkits-rcetechnical-descriptionexploit
https://xerte.org.uk/xertetoolkits_3.15_ChangeLog.htmlrelease-notes
https://xerte.org.uk/index.php/en/downloads-1/category/3-xerte-online-toolkitsproductpermissions-required
https://github.com/thexerteproject/xerteonlinetoolkits/issues/1527issue-tracking
https://github.com/thexerteproject/xerteonlinetoolkits/commit/02661be88cc369325ea01b508086bde7fbfec805patch
https://github.com/thexerteproject/xerteonlinetoolkits/commit/17e4f945fe6a3400fa88c01eda18c1075ee4a212patch
https://github.com/thexerteproject/xerteonlinetoolkits/commit/507d55c5e91bf9310b5b1c7fad8aebfef902ad23patch
https://www.vulncheck.com/advisories/xerte-online-toolkits-file-upload-rce-via-elfinder-connectorthird-party-advisory

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