CVE-2026-77788 Rank Math SEO < 1.0.277 - Author+ Arbitrary Post and User Metadata Overwrite via updateSchemas
Authors can overwrite arbitrary post and user metadata, potentially escalating privileges or modifying data belonging to higher-privileged users.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-77788?
CVE-2026-77788 is a medium-severity missing authorization vulnerability in Unknown Rank Math SEO, published on 2 Sep 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Official description
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.
Weakness: CWE-639
Which versions are affected by CVE-2026-77788?
How do I fix CVE-2026-77788?
No fix has been published for CVE-2026-77788 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-77788 being exploited?
There is no known exploitation of CVE-2026-77788 in the wild and no public exploit code.
Sources
Also known as GHSA-4vrc-p2pf-p4qj.