All in One SEO contributors can store script in post metadata
All in One SEO before 5.0.0.1 does not sanitize and escape some post content before rendering it in the editor. A Contributor or higher can store script that executes when a higher-privileged user edits the affected post.
- Component
- All in One SEO
- Plugin slug
all-in-one-seo- Affected
- < 5.0.0.1
- Safe version
5.0.0.1- Published
- Sep 02, 2026
This CVE was published Sep 02, 2026 and is one of 9 known issues for this plugin.
Update, patch or deactivate.
Update to 5.0.0.1 or later, review untrusted post content, and investigate privileged activity after affected posts were edited.
A safe version is available, so updating to that version or later is the preferred remediation. If an immediate update is not practical, consider a targeted application patch or temporarily restricting the affected functionality.
Deactivate only when warranted by your risk profile, or when advised by your hosting provider in the limited circumstances where the vulnerability cannot otherwise be mitigated. If you’re unsure which action is appropriate, contact Fused or your hosting provider for guidance.
Technical description
The All in One SEO WordPress plugin before 5.0.0.1 does not sanitise and escape some content stored in posts before rendering it back in the post editor, which could allow users with the contributor role and above to perform Stored Cross-Site Scripting attacks that trigger when a higher privileged user edits the post.
CVE / CNA vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:H/I:H/A:H