PT-2026-54778 · Craft Cms · Craft Cms

Larlarua · Published 2026-07-01 · Updated 2026-07-02 · CVE-2026-50279

Positive Technologies (AI Summary)

CVSS v4.0

7.6

High

Base vector

AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Name of the Vulnerable Software and Affected Versions Craft CMS versions 5.0.0-RC1 through 5.9.20

Description An authorship spoofing issue exists in the content management system. The theEntriesController::actionSaveEntry() function performs entry-edit permission checks before request-controlled author changes are applied to the model. The author mutation path accepts attacker-supplied authors or author parameters and allows the change if the current user is one of the previous authors. Since the controller does not re-verify authorization after mutating the author list, a low-privileged user can reassign an entry's authorship to another user without possessing the required peer-author-change permission.

Recommendations Update to version 5.9.21.

Exploit

Fix

Improper Authorization

Weakness Enumeration

CWE-285

Related Identifiers

CVE-2026-50279

GHSA-QQ2C-2Q8J-JH27

Affected Products

Craft Cms

References · 8

• 🔥 https://github.com/craftcms/cms/security/advisories/GHSA-qq2c-2q8j-jh27 · Exploit
• https://nvd.nist.gov/vuln/detail/CVE-2026-50279 · Security Note
• https://osv.dev/vulnerability/GHSA-qq2c-2q8j-jh27 · Vendor Advisory
• https://github.com/craftcms/cms/commit/9cc493be8b414d7116c7f2bc2a6d0926e73f1248 · Note
• https://github.com/craftcms/cms · Note
• https://twitter.com/infoflowcloud/status/2072496942383341684 · Twitter Post
• https://twitter.com/VulmonFeeds/status/2072488598222364968 · Twitter Post
• https://twitter.com/CVEnew/status/2072495334484492534 · Twitter Post