CVE-2026-16536 Simple Google Calendar Outlook Events Widget < 3.1.0 - Unauthenticated SSRF via calendar_id
Unauthenticated attackers can exploit a lack of URL validation in the Simple Google Calendar Outlook Events Widget to perform Server-Side Request Forgery and potentially read internal responses.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-16536?
CVE-2026-16536 is a medium-severity server-side request forgery vulnerability in Unknown Simple Google Calendar Outlook Events Widget, published on 4 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
The Simple Google Calendar Outlook Events Widget WordPress plugin before 3.1.0 does not validate a user-supplied URL before performing a server-side request, allowing unauthenticated attackers to perform Server-Side Request Forgery attacks and, in some cases, read the response of the internal request.
Weakness: CWE-918
Which versions are affected by CVE-2026-16536?
How do I fix CVE-2026-16536?
No fix has been published for CVE-2026-16536 yet. Limit exposure of the affected software until one is available.
Upgrade, and send outbound requests through an allow-list that blocks internal addresses. More about Server-side request forgery.
Is CVE-2026-16536 being exploited?
There is no known exploitation of CVE-2026-16536 in the wild and no public exploit code.
Sources
Also known as GHSA-ff6j-mvmc-7fp8.