CVE-2026-81891
elFinder ZIP extraction flaw allows PHP files to be written and RCE.
Is CVE-2026-81891 being exploited?
Not confirmed. CVE-2026-81891 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.53% probability of exploitation in the next 30 days.
How severe is CVE-2026-81891?
CVE-2026-81891 is rated High. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-81891?
Yes. A fix has been recorded for CVE-2026-81891. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-81891 affect?
CVE-2026-81891 affects elFinder < 2.1.70, PHP web servers using elFinder with archive extraction enabled, Web apps exposing elFinder files/ directory. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-81891?
Upgrade to elFinder 2.1.70, disable extraction or restrict uploads and validate MIME types
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Authenticated ZIP upload can extract PHP-executable files into web-accessible dirs, enabling remote code execution.
Immediate action required
- affected< 2.1.70
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.