CVE-2026-25491
Craft CMS Vulnerable to Stored XSS in Entry Types Name
Description
## Summary Stored XSS via Entry Type names. The name is not sanitized when displayed in the Entry Types list. --- ## Proof of Concept ### Required Permissions (Attacker) - Admin access (only admins have access to the settings page) - `allowAdminChanges` is enabled in production, which is against our [security recommendations](https://craftcms.com/knowledge-base/securing-craft). ### Steps to Reproduce 1. Log in as an attacker. 2. Go to **Settings** -> **Entry Types** (`/admin/settings/entry-types`). 3. Create a new Entry Type. 4. Set **Name** to: ```html <img src=x onerror="alert('XSS-EntryTypes')" hidden> ``` 5. Save the Entry Type, and you’ll be redirected back to the entry types table automatically. 6. Notice the alert fires when the entry types table renders.
How to fix CVE-2026-25491
To remediate CVE-2026-25491, upgrade the affected package to a fixed version below.
- —upgrade to 5.8.22 or later
Is CVE-2026-25491 being exploited?
Low — EPSS is 0.0%, meaning exploitation activity has not been observed at scale.
Affected packages (1)
- >= 5.0.0-RC1, < 5.8.22
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 4.0 | — | CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:P/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 |