CVE-2026-34415
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.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (3.57%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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.
- CVSS 4.0
- 9.3 CRITICALCVSS: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/M
- EPSS
- 3.57% probability · 89th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-184
- Source
- disclosure@vulncheck.com
References
- https://github.com/bootstrapbool/xerteonlinetoolkits-rce
- https://github.com/thexerteproject/xerteonlinetoolkits/commit/02661be88cc369325ea01b508086bde7fbfec805
- https://github.com/thexerteproject/xerteonlinetoolkits/commit/17e4f945fe6a3400fa88c01eda18c1075ee4a212
- https://github.com/thexerteproject/xerteonlinetoolkits/commit/507d55c5e91bf9310b5b1c7fad8aebfef902ad23
- https://github.com/thexerteproject/xerteonlinetoolkits/issues/1527
- https://www.vulncheck.com/advisories/xerte-online-toolkits-file-upload-rce-via-elfinder-connector
- https://xerte.org.uk/index.php/en/downloads-1/category/3-xerte-online-toolkits
- https://xerte.org.uk/xertetoolkits_3.15_ChangeLog.html
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.