What is GHSA-858x-6wp8-wp5c?

GHSA-858x-6wp8-wp5c is a security advisory published by GitHub Security Advisories with Medium severity. The K2 frontend article-save handler accepts an `attachment[N][existing]` POST field that is...

Which CVE IDs does GHSA-858x-6wp8-wp5c cover?

GHSA-858x-6wp8-wp5c covers the following CVE IDs: CVE-2026-48944. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of GHSA-858x-6wp8-wp5c?

GHSA-858x-6wp8-wp5c has a CVSS v3 base score of 6.5, published by GitHub Security Advisories.

GHSA-858x-6wp8-wp5cMediumCVSS 6.5

The K2 frontend article-save handler accepts an `attachment[N][existing]` POST field that is...

Vendor

GitHub Security Advisories

Published

June 25, 2026

Last Modified

June 25, 2026

🔗 CVE IDs covered (1)

CVE-2026-48944 →

📋 Description

The K2 frontend article-save handler accepts an attachment[N][existing] POST field that is concatenated with JPATH_SITE/ and passed to JFile::copy(). JPath::clean does NOT strip .., and there is no allow-list of source paths. An Author can therefore copy configuration.php (or any other file readable by the web user — including ../../../etc/passwd) into /media/k2/attachments/, then retrieve the contents via the K2 attachment-download endpoint.

🔗 References (3)

https://nvd.nist.gov/vuln/detail/CVE-2026-48944
https://www.getk2.org
https://github.com/advisories/GHSA-858x-6wp8-wp5c