Quick answers
- Is CVE-2026-77787 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-77787 being exploited in the wild.
- How severe is CVE-2026-77787?
- Low severity, with a CVSS score of 2.7, published 2 September 2026.
- Which products and versions are affected?
- Rank Math SEO before 1.0.277.
- Is there a fix for CVE-2026-77787?
- A patch was published on 2026-09-02: Fixed in version 1.0.277 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
- How is CVE-2026-77787 attacked?
- It is attacked over the network.
- Am I affected by CVE-2026-77787?
- Check whether you run Rank Math SEO at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
The vulnerability is a broken access control issue (CWE-862) in the updateMetaBulk REST endpoint of Rank Math SEO before version 1.0.277. The endpoint fails to perform per-object capability checks when the objectType parameter is set to "term", and reuses the supplied object identifier across different object types (posts and terms) without validation. An authenticated user with Author role or higher can send a POST request to /rankmath/v1/updateMetaBulk with objectType="term" and an ID that matches both an existing post and a term ID to simultaneously modify term metadata and overwrite post titles. No additional preconditions beyond basic WordPress install defaults (like category ID 1 matching post ID 1) are required. The fix is available in version 1.0.277.
Affected products
- Rank Math Rank Math SEO before 1.0.277
Timeline
- 2026-08-31: disclosed
- 2026-09-02: patched: Fixed in version 1.0.277