CVE-2026-18937: CWE-94 Improper Control of Generation of Code ('Code Injection') in Broken Link Checker
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.
AI Analysis
Technical Summary
CVE-2026-18937 is a code injection vulnerability (CWE-94) in the Broken Link Checker WordPress plugin prior to version 2.4.12. The plugin fails to restrict which query variables it accepts from user input on sites configured with plain permalinks. This allows unauthenticated attackers to overwrite PHP global variables and execute arbitrary code on the server, specifically when the classic editor is active. No CVSS score or patch information is currently provided, and no known exploits are reported in the wild.
Potential Impact
Successful exploitation enables unauthenticated attackers to execute arbitrary PHP code on the server, potentially leading to full site compromise, data exposure, or further malicious activity. The vulnerability affects sites using plain permalinks and the classic editor, increasing the attack surface for unauthenticated remote code execution.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, consider disabling the Broken Link Checker plugin or switching to a permalink structure other than plain. Monitor official vendor channels for updates and apply patches promptly once released.
CVE-2026-18937: CWE-94 Improper Control of Generation of Code ('Code Injection') in Broken Link Checker
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.
Affected software
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-18937 is a code injection vulnerability (CWE-94) in the Broken Link Checker WordPress plugin prior to version 2.4.12. The plugin fails to restrict which query variables it accepts from user input on sites configured with plain permalinks. This allows unauthenticated attackers to overwrite PHP global variables and execute arbitrary code on the server, specifically when the classic editor is active. No CVSS score or patch information is currently provided, and no known exploits are reported in the wild.
Potential Impact
Successful exploitation enables unauthenticated attackers to execute arbitrary PHP code on the server, potentially leading to full site compromise, data exposure, or further malicious activity. The vulnerability affects sites using plain permalinks and the classic editor, increasing the attack surface for unauthenticated remote code execution.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, consider disabling the Broken Link Checker plugin or switching to a permalink structure other than plain. Monitor official vendor channels for updates and apply patches promptly once released.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- WPScan
- Date Reserved
- 2026-08-05T12:42:03.011Z
- Cvss Version
- null
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a854e93c6e8be033248b29b
Added to database: 08/19/2026, 06:34:59 UTC
Last enriched: 08/19/2026, 06:54:16 UTC
Last updated: 08/19/2026, 11:17:36 UTC
Views: 7
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