Which versions of PHP are affected by EUVD-2026-41409?

Craft CMS versions 5.7.0 through 5.9.20 contain a privilege escalation vulnerability allowing content authors to modify entries owned by other users, including publication metadata and author…. A patch is available.

How to fix or mitigate EUVD-2026-41409?

Within 24 hours: Identify all Craft CMS deployments and confirm version. Within 7 days: Upgrade to Craft CMS 5.9.21 or later on all affected instances. Within 30 days: Audit entry change logs for unauthorized modifications and validate content integrity.

PHP EUVD-2026-41409

Q: What is the CVSS score of EUVD-2026-41409?

EUVD-2026-41409 has a CVSS 4.0 base score of 7.1 (High). CVSS vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/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. EPSS exploitation probability: 0.3%.

| CVE-2026-50281 HIGH

Improperly Controlled Modification of Dynamically-Determined Object Attributes (CWE-915)

2026-07-02 GitHub_M

GHSA-x5m4-g2cq-52pq

PHP Information Disclosure Cms Craftcms

7.1

CVSS 4.0 · Vendor: GitHub_M

Severity by source

Vendor (GitHub_M) PRIMARY

7.1 HIGH

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/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

Primary rating from Vendor (GitHub_M) · only source for this CVE.

CVSS VectorVendor: GitHub_M

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Lifecycle Timeline

Patch available

Jul 02, 2026 - 18:01 EUVD

Analysis Generated

Jul 02, 2026 - 17:22 vuln.today

DescriptionCVE.org

Craft CMS is a content management system (CMS). Versions 5.7.0 and above, prior to 5.9.21 contain a mass-assignment flaw in the bulk-duplicate element action. An attacker who is only able to duplicate their own entires can submit an arbitrary id through the newAttributes request parameter. The duplication routine overrides its own id = null reset with that value and writes the attacker's attributes into the victim's existing entry row. ElementsController::beforeAction() pulls the request body into $this->_attributes and rejects requests that ship an id or canonicalId key at the top level, actionBulkDuplicate(), reads a separate newAttributes array and passes it straight through to the service layer. Elements::duplicateElement() clones the source element, sets id to null, and then hands the attacker's array to Craft::configure(), which overwrites the reset id with any numeric value inside $newAttributes. PHP Yii's saveElement() then performs an UPDATE against the row with that primary key instead of an INSERT. The attackers's title, slug, authorId, postDate, and UID land on the victim's entry. safeAttributes() on Entry includes id because the base element model exposes it, so the Collection::only() filter does not strip it. This issue has been fixed in version 5.9.21.

AnalysisAI

Cross-tenant entry takeover in Craft CMS 5.7.0 through 5.9.20 lets a low-privileged author overwrite another user's existing entry by smuggling a numeric id through the newAttributes parameter of the bulk-duplicate element action. Because the duplication routine re-applies attacker-controlled attributes after nulling the primary key, a UPDATE is executed against the victim's row instead of an INSERT, letting the attacker rewrite the victim's title, slug, authorId, postDate, and UID. No public exploit identified at time of analysis and it is not in CISA KEV; the flaw is fixed in version 5.9.21.