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CVE-2026-48939

Critical CVSS 9.8 Known exploited

Published 2026-06-20 · last changed 2026-07-11 · added to CISA KEV 2026-07-10

This one is being exploited in the wild.

CISA added CVE-2026-48939 to the Known Exploited Vulnerabilities catalog on 2026-07-10. Federal agencies are required to remediate it on a deadline. If you have affected machines, this is the class of finding that moves ahead of the rest of the queue.

The fix

We hold no Microsoft remediation data for CVE-2026-48939, which normally means it is not a Windows CVE. For non-Microsoft software the fix is the vendor's own updated release, and the affected versions are listed below.

What it is

A vulnerability in the iCagenda extension for Joomla allows the upload of arbitrary files in the file attachment feature, ultimately resulting in PHP code upload and execution.

Sources

CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H