How severe is CVE-2026-34415?

CVE-2026-34415 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-34415 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 4% (91st percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2026-34415?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

Does CVE-2026-34415 have an EU (EUVD) identifier?

Yes. CVE-2026-34415 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-25069.

When was CVE-2026-34415 published?

CVE-2026-34415 was published on 2026-04-22 and last updated on 2026-07-14.

CVE-2026-34415

CVE-2026-34415 is a critical-severity vulnerability with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-184.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v4: 9.3
EPSS exploit prediction: 4% (91st percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-25069
Weakness: CWE-184
Published: 2026-04-22
Last modified: 2026-07-14

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.

Frequently asked questions

What is 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. 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.
How severe is CVE-2026-34415?: CVE-2026-34415 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-34415 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 4% (91st percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2026-34415?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2026-34415 have an EU (EUVD) identifier?: Yes. CVE-2026-34415 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-25069.
When was CVE-2026-34415 published?: CVE-2026-34415 was published on 2026-04-22 and last updated on 2026-07-14.

References

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