Quick answers
- Is CVE-2026-90978 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-90978 being exploited in the wild.
- How severe is CVE-2026-90978?
- High severity, with a CVSS score of 7.1, published 18 September 2026.
- Which products and versions are affected?
- Wordpress Filter Gallery before 1.1.5.
- Is there a fix for CVE-2026-90978?
- A patch was published on 2026-09-18: Fixed in version 1.1.5 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
- How is CVE-2026-90978 attacked?
- It is attacked over the network, in a web application.
- Am I affected by CVE-2026-90978?
- Check whether you run Wordpress Filter Gallery at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
The vulnerability is a broken access control issue (CWE-284) in the Filter Gallery WordPress plugin versions before 1.1.5. Multiple AJAX handlers implement a fail-open nonce verification mechanism: when the nonce parameter is omitted, the validation is skipped entirely rather than being rejected. Combined with the absence of capability checks, this allows any authenticated user (subscriber level and above) to invoke sensitive actions. An attacker can craft AJAX requests to overwrite arbitrary post content or delete plugin options without the required permissions or CSRF protection. The issue requires network access and authentication but no user interaction. Patches are available in version 1.1.5 and later.
Affected products
- WordPress Filter Gallery before 1.1.5
Timeline
- 2026-09-16: disclosed
- 2026-09-18: patched: Fixed in version 1.1.5