CVE-2026-18666 Library Management System < 3.6.7 - Subscriber+ SQL Injection via Filter Value
Subscribers can perform SQL injection to extract arbitrary database data, including password hashes, in the Library Management System plugin.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-18666?
CVE-2026-18666 is a medium-severity SQL injection vulnerability in Unknown Library Management System, published on 10 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
The Library Management System WordPress plugin before 3.6.7 does not sanitize and escape a user-supplied parameter before using it in a SQL statement, allowing users with a role as low as Subscriber to perform SQL injection and extract arbitrary data from the database, including user password hashes.
Weakness: CWE-89
Which versions are affected by CVE-2026-18666?
How do I fix CVE-2026-18666?
No fix has been published for CVE-2026-18666 yet. Limit exposure of the affected software until one is available.
Use parameterised queries everywhere and never build SQL by joining strings. Upgrade affected software first; a web application firewall only buys time. More about SQL injection.
Is CVE-2026-18666 being exploited?
There is no known exploitation of CVE-2026-18666 in the wild and no public exploit code.
Sources
Also known as GHSA-2c9h-p9wv-wmqh.