CVE-2026-14827 Calendar < 1.3.18 - Contributor+ Stored XSS via event_link Parameter
Contributors can inject JavaScript via the event_link parameter, leading to stored XSS execution in viewers' browsers.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-14827?
CVE-2026-14827 is a medium-severity cross-site scripting vulnerability in Unknown Calendar, published on 27 Jul 2026. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link.
Official description
The Calendar WordPress plugin before 1.3.18 does not properly escape a user-supplied event field before outputting it inside an HTML attribute on a public-facing page, allowing users with the Contributor role to inject arbitrary JavaScript that executes in the browser of anyone viewing the calendar.
Weakness: CWE-79
Which versions are affected by CVE-2026-14827?
How do I fix CVE-2026-14827?
No fix has been published for CVE-2026-14827 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-14827 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-14827 exists.
Sources
Also known as GHSA-x423-2wcq-r3qx.