Auth bypass in Rank Math Seo

CVE-2026-77788

The Rank Math SEO WordPress plugin before 1.0.277 does not verify that the metadata row being updated belongs to the object the user was authorised against, allowing users with the Author role and above to overwrite arbitrary post and user metadata, including that belonging to higher-privileged users.

Vulnerability class: IDOR (Insecure Direct Object Reference)

Published · last modified .

CVSS v3 metric

CVSS v3 base score 4.9 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N.

EPSS exploit prediction

EPSS: 0.003 (24.8th percentile), scored .

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 25th percentile — 24.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS trend (30 days)EPSS over the last 30 days for CVE-2026-77788: held from 0.002 to 0.003.

EPSS over last 30 days · oldest: 0.002 · newest: 0.003 · change: +0.001

Affected products

  • Rank Math Seo

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-77788?
CVE-2026-77788 is a medium-severity vulnerability in Rank Math Seo, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 4.9/10. Published 2026-09-02.
How severe is CVE-2026-77788?
Medium severity. CVSS v3 base score is 4.9 out of 10.