What the vulnerability does
01Description
Missing Authorization vulnerability in Spiffy Plugins Spiffy Calendar spiffy-calendar allows Exploiting Incorrectly Configured Access Control Security Levels.This issue affects Spiffy Calendar: from n/a through <= 5.0.7.
Explanation of Vulnerability in Simple Terms
02Summary
Spiffy Calendar versions 5.0.7 and earlier lack proper authorization checks, allowing authenticated users to modify calendar data they should not have access to. An attacker with a low-privilege account can alter calendar entries or settings without proper permission validation. The vulnerability requires an existing user account but does not affect data confidentiality or system availability.
What an attacker can do
03Attacker Capabilities
Modify calendar data or settings belonging to other users or restricted areas.
Potential impact on your site
04Site Impact
Unauthorized changes to calendar content; data integrity compromised but not exposed or deleted.
Conditions required to exploit
05Prerequisites
Attacker must have a valid user account with low-level privileges on the site.
Key dates
06Disclosure timeline
December 24, 2025
CVE published
April 28, 2026
Record updated