CVE-2026-90978 Filter Gallery < 1.1.5 - Subscriber+ Arbitrary Post Overwrite and Plugin Option Deletion via Fail-Open Nonce Check
Low-privileged users can overwrite arbitrary posts and delete plugin options due to missing nonce and capability checks in AJAX handlers.
- 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-2026-90978?
CVE-2026-90978 is a high-severity missing authorization vulnerability in Unknown Filter Gallery, published on 18 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
The Filter Gallery WordPress plugin before 1.1.5 does not verify the nonce on several of its AJAX handlers when the nonce field is omitted, and applies no capability check, allowing low-privileged users to overwrite the content of arbitrary posts and delete the Filter Gallery WordPress plugin before 1.1.5's stored gallery options.
Weakness: CWE-284
Which versions are affected by CVE-2026-90978?
How do I fix CVE-2026-90978?
No fix has been published for CVE-2026-90978 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-90978 being exploited?
There is no known exploitation of CVE-2026-90978 in the wild and no public exploit code.
Sources
Also known as GHSA-hrf4-x4j2-f44x.