CVE-2026-97278 WordPress Polylang plugin <= 3.8.9 - PHP Object Injection vulnerability
An attacker can exploit PHP object injection in the Polylang plugin to potentially execute arbitrary code on the WordPress site.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-97278?
CVE-2026-97278 is a high-severity unsafe deserialization vulnerability in WP SYNTEX Polylang, published on 14 Oct 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Official description
Deserialization of Untrusted Data vulnerability in WP SYNTEX Polylang polylang allows Object Injection.This issue affects Polylang: from n/a through 3.8.9.
Weakness: CWE-502
Which versions are affected by CVE-2026-97278?
How do I fix CVE-2026-97278?
No fix has been published for CVE-2026-97278 yet. Limit exposure of the affected software until one is available.
Upgrade, and only deserialise data from trusted sources or with an allow-list of types. More about Unsafe deserialization.
Is CVE-2026-97278 being exploited?
There is no known exploitation of CVE-2026-97278 in the wild and no public exploit code.
Sources
Also known as GHSA-qr9f-p3hp-mggj.