PatchTheCVECVE-2026-34415: Xerte Online Toolkits versions 3.15 and earlier contain an incomplete input validation vulnerability in the el
CVE-2026-34415 is a critical-severity flaw (CVSS 9.8) affecting affected software. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
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 comma
Why this priority
- Critical severity
- Public exploit reference
- Remotely exploitable, no login, no user action
A fixed release or distro patch exists.
Risk facts
| CVSS score | 9.8 (Critical) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | None |
| User interaction | None |
| EPSS exploit chance | 3.6% (top 11%) |
| CISA exploited list | No |
| Weakness | CWE-184 |
| Published | 2026-04-22 |
| Last modified | 2026-10-26 |
Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Timeline
- Published CVE record published
- Updated Record last modified
Exact fixes by distribution
Public exploits and detection
Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.
- Write-up: github.com/thexerteproject/xerteonlinetoolkits/issues/1527
- Write-up: www.vulncheck.com/advisories/xerte-online-toolkits-file-upload-rce-via-elfinder-connector
- Write-up: xerte.org.uk/xertetoolkits_3.15_ChangeLog.html
- Metasploit: Xerte Online Toolkits Arbitrary File Upload - Unauthenticated Media Upload
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2026-34415?
No fixed release is listed yet. Watch the vendor advisory and apply any mitigation shown on this page.
Is CVE-2026-34415 being exploited?
CVE-2026-34415 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2026-34415 affect?
CVE-2026-34415 affects affected software. Severity is critical (CVSS 9.8). 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 a
How urgent is CVE-2026-34415?
Priority 67/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action