CVE-2026-2355 Cross-site scripting in My Calendar – Accessible Event Manager
Authenticated attackers can inject arbitrary scripts via shortcode attributes, leading to stored XSS execution on victim pages.
- 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-2026-2355?
CVE-2026-2355 is a medium-severity cross-site scripting vulnerability in joedolson My Calendar – Accessible Event Manager, published on 4 Mar 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
The My Calendar – Accessible Event Manager plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the `template` attribute of the `[my_calendar_upcoming]` shortcode in all versions up to, and including, 3.7.3. This is due to the use of `stripcslashes()` on user-supplied shortcode attribute values in the `mc_draw_template()` function, which decodes C-style hex escape sequences (e.g., `\x3c` to `<`) at render time, bypassing WordPress's `wp_kses_post()` content sanitization that runs at save time. This makes it possible for authenticated attackers, with Contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.
Weakness: CWE-79
Which versions are affected by CVE-2026-2355?
How do I fix CVE-2026-2355?
No fix has been published for CVE-2026-2355 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-2026-2355 being exploited?
There is no known exploitation of CVE-2026-2355 in the wild and no public exploit code.
Sources
Also known as GHSA-2w6m-q82q-c77g.