CVE-2026-18937
Critical
Description
The Broken Link Checker WordPress plugin before 2.4.12 does not limit which query variables it accepts from user input on sites using plain permalinks, allowing unauthenticated users to overwrite arbitrary PHP global variables, and to execute arbitrary code on the server when a classic (non-block) is active.
SeverityCritical
CVSS9.0
Exploit probability—
ProductBroken Link Checker
PublishedAug 19, 2026
First seenAug 19, 2026
Weakness typeCWE-94Code injection
How to fix
Update
- Broken Link Checker2.4.12 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Broken Link Checker | v < 2.4.12 | 2.4.12 |
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