CVE-2026-18937 json
Broken Link Checker < 2.4.12 - Unauthenticated RCE via Query Variable Injection
published 2026-08-19 2 mo ago modified 2026-08-26 2 mo ago also EUVD-2026-62285
- cvss
- 9.0
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 2.0%
- EPSS 2.0% chance of exploitation in 30 days, percentile 80%
- public exploits
- 0
- none known, plus a Nuclei check
Summary
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.
Patch / fix
- Unknown Broken Link Checker 2.4.12
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- total
- Assessed
- 2 mo ago
Exploit prediction
1.99% chance of exploitation in the next 30 days, higher than 80% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- Nuclei template WordPress Broken Link Checker < 2.4.12 - Remote Code Execution nuclei detection template
- wpscan.com https://wpscan.com/vulnerability/a23b76eb-107d-4e02-8eae-c3c5fa5b003d/ referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CISA ADP | 3.1 | 9.0 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H |
| CNA | 3.1 | 9.0 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H |
Affected products
- Unknown Broken Link Checker
Classification
- Weakness
-
- CWE-94 Improper Control of Generation of Code
- Technology feeds
References
-
wpscan.com
/vulnerability/a23b76eb-107d-4e02-8eae-c3c5fa5b003d/
exploit, vdb-entry, technical-description
Sources
- CVE List CVE-2026-18937
- NVD CVE-2026-18937
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.