Quick answers
- Is CVE-2026-121863 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-121863 being exploited in the wild.
- How severe is CVE-2026-121863?
- Informational severity, published 11 November 2026.
- Which products and versions are affected?
- Wordpress Knowledge Building before 0.7.3.
- Is there a fix for CVE-2026-121863?
- Yes: fixed in 0.7.3. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
- How is CVE-2026-121863 attacked?
- It is attacked over the network, in a software library.
- Am I affected by CVE-2026-121863?
- Check whether you run Wordpress Knowledge Building 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.
How to fix
- Fixed in: 0.7.3
Technical details
The plugin contains a reflected cross-site scripting (XSS) vulnerability in an AJAX endpoint available to unauthenticated users. User-supplied values are echoed back in the HTML response without proper escaping, allowing an attacker to inject arbitrary JavaScript. An attacker can craft a malicious URL or AJAX request that, when triggered by a user, executes the injected script in that user's session context.
Affected products
- wordpress Knowledge Building before 0.7.3
Timeline
- 2026-11-09: disclosed
- 2026-11-11: advisory