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.
References8
- github.com/bootstrapbool/xerteonlinetoolkits-rce
- github.com/thexerteproject/xerteonlinetoolkits/commit/02661be88…
- github.com/thexerteproject/xerteonlinetoolkits/commit/17e4f945f…
- github.com/thexerteproject/xerteonlinetoolkits/commit/507d55c5e…
- github.com/thexerteproject/xerteonlinetoolkits/issues/1527
- www.vulncheck.com/advisories/xerte-online-toolkits-file-upload-…
- xerte.org.uk/index.php/en/downloads-1/category/3-xerte-online-t…
- xerte.org.uk/xertetoolkits_3.15_ChangeLog.html
Metrics
- CVSS 3.1
-
9.8
CRITICAL
Score source: CNA
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - CVSS 4.0
-
9.3
CRITICAL
Score source: CNA
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X - EPSS — exploit probability
- 4% percentile: 90 · as of 13 November 2026
- CWE
- CWE-184
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.