CVE-2026-22351
Missing Authorization in WP FullCalendar ≤1.6 Enables Unauthorized Access
Publication date: 2026-02-20
Last updated on: 2026-04-28
Assigner: Patchstack
Description
Description
CVSS Scores
EPSS Scores
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Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| patchstack | wp_fullcalendar | to 1.6 (inc) |
Helpful Resources
Exploitability
| CWE ID | Description |
|---|---|
| CWE-862 | The product does not perform an authorization check when an actor attempts to access a resource or perform an action. |
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?
CVE-2026-22351 is a Broken Access Control vulnerability in the WordPress WP FullCalendar Plugin versions up to and including 1.6.
The issue arises from missing authorization, authentication, or nonce token checks in certain plugin functions, which allows unauthenticated users to perform actions that should be restricted to higher privileged users.
This vulnerability is classified under the OWASP Top 10 category A1: Broken Access Control.
How can this vulnerability impact me? :
This vulnerability can allow unauthenticated attackers to perform privileged actions within the WP FullCalendar plugin, potentially leading to unauthorized changes or access to sensitive functionality.
Because the vulnerability has a CVSS score of 7.5, it is considered moderately severe with a significant likelihood of exploitation.
Without proper mitigation or patching, affected websites are at risk of compromise through exploitation of this broken access control.
How does this vulnerability affect compliance with common standards and regulations (like GDPR, HIPAA)?:
I don't know
How can this vulnerability be detected on my network or system? Can you suggest some commands?
There is no specific information provided about detection commands or methods for this vulnerability.
What immediate steps should I take to mitigate this vulnerability?
Since no official patch is currently available for CVE-2026-22351, immediate mitigation involves applying the mitigation rule issued by Patchstack.
- Apply the Patchstack mitigation rule that blocks all legitimate and illegitimate requests related to this vulnerability.
- Use automated vulnerability mitigation services offered by Patchstack to maintain security until an official patch is released.
These steps effectively prevent exploitation by addressing the missing authorization and broken access control issues.