thexerteproject xerteonlinetoolkits up to 3.13.0/3.14.0/3.15.0 elFinder Connector Endpoint incomplete blacklist

Summaryinfo

A vulnerability was found in thexerteproject xerteonlinetoolkits up to 3.13.0/3.14.0/3.15.0. It has been classified as critical. This impacts an unknown function of the component elFinder Connector Endpoint. Performing a manipulation results in incomplete blacklist. This vulnerability is cataloged as CVE-2026-34415. It is possible to initiate the attack remotely. There is no exploit available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability, which was classified as critical, was found in thexerteproject xerteonlinetoolkits up to 3.13.0/3.14.0/3.15.0. This affects an unknown code block of the component elFinder Connector Endpoint. The manipulation with an unknown input leads to a incomplete blacklist vulnerability. CWE is classifying the issue as CWE-184. The product implements a protection mechanism that relies on a list of inputs (or properties of inputs) that are not allowed by policy or otherwise require other action to neutralize before additional processing takes place, but the list is incomplete, leading to resultant weaknesses. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

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.

The weakness was shared by bootstrapbool as 1527. The advisory is shared at xerte.org.uk. This vulnerability is uniquely identified as CVE-2026-34415 since 03/27/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1562.006 for this issue.

Upgrading eliminates this vulnerability. The upgrade is hosted for download at xerte.org.uk. Applying the patch 02661be88cc369325ea01b508086bde7fbfec805 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-25069). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Type

• Project Management Software

Vendor

• thexerteproject

Name

• xerteonlinetoolkits

Version

• 3.0
• 3.1
• 3.2
• 3.3
• 3.4
• 3.5
• 3.6
• 3.7
• 3.8
• 3.9
• 3.10
• 3.11
• 3.12
• 3.13
• 3.13.0
• 3.14
• 3.14.0
• 3.15.0

License

• open-source

Website

• Product: https://github.com/thexerteproject/xerteonlinetoolkits/

CPE 2.3info

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CPE 2.2info

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Entryinfo

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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