Vulnerability details
CVE-2026-18937
Broken Link Checker
Broken Link Checker < 2.4.12 - Unauthenticated RCE via Query Variable Injection
CVSS 3.1
9.0Critical
Official 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.
CVSS scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 9.0Critical | 3.1 | CISA ADP / Vulnrichment (CISA-ADP) | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| — | Broken Link Checker | v < 2.4.12 | CVEProject cvelistV5 (CNA) |
References and advisories
1- https://wpscan.com/vulnerability/a23b76eb-107d-4e02-8eae-c3c5fa5b003d/ exploitvdb-entrytechnical-description
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Details
- Published
- 2026-08-19
- Last updated
- 2026-08-19
- State
- Published
- Assigner (CNA)
- WPScan
Exploit prediction (EPSS)
1.99%
Probability of exploitation in 30 days
80.8%
Percentile (among all CVEs)
SSVC assessment (CISA)
- Automatable
- No
- Exploitation
- None
- Technical impact
- Total
Weaknesses (CWE)
- CWE-94Improper Control of Generation of Code ('Code Injection')