CVE-2026-48945: Joomla Extension - getk2.org - Privileged RCE vulnerability in K2 extension for Joomla < 2.26

Severity: medium (CVSS 5.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-06-25 · updated 2026-10-25
Weakness: CWE-434

Description

The K2 article gallery upload path accepts a zip/tar archive, extracts it under `/media/k2/galleries/<id>/`, and only renames image files (gif/jpg/jpeg/png/webp) to safe names — non-image files (including `.php`) are extracted as-is and remain executable via direct HTTP access.

Affected products

getk2.org K2 extension for Joomla: through 2.26

References

https://www.getk2.org/

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