CVE-2026-113349CWE-639

CVE-2026-113349

Medium · published October 20, 2026

CVSS v3.1
4.3
EPSS
0%
Percentile
10.4
In the wild
Unconfirmed
What it is

OpenCATS before 0.10.0 contains a missing authorization vulnerability in CalendarUI::onEditEvent() and onDeleteEvent() that allows authenticated users to modify or delete other users' calendar events. Attackers with EDIT or DELETE access can supply arbitrary eventID values to alter or remove any user's events, including non-public ones restricted to their owner.

The record
Technical detail
CVSS v3.1
4.3 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
CVSS v4.0
5.3 · CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
EPSS
0.00208 · 10.4th percentile
Weakness
CWE-639 · Authorization Bypass Through User-Controlled Key
Published
2026-10-20T15:17Z
References (7)
https://github.com/opencats/OpenCATS/blob/5781f41814f09493c7ce05b9251b5e09c1aff0cd/modules/calendar/CalendarUI.php#L555-L585 · [email protected]https://github.com/opencats/OpenCATS/blob/5781f41814f09493c7ce05b9251b5e09c1aff0cd/modules/calendar/CalendarUI.php#L690-L712 · [email protected]https://github.com/opencats/OpenCATS/commit/aa3b414c3672f5010ca26c44192aa8e72d3735bd · [email protected]https://github.com/opencats/OpenCATS/issues/720 · [email protected]https://github.com/opencats/OpenCATS/releases/tag/v0.10.0 · [email protected]https://www.vulncheck.com/advisories/opencats-before-0.10.0-missing-authorization-in-calendar-editevent-deleteevent · [email protected]https://github.com/opencats/OpenCATS/blob/5781f41814f09493c7ce05b9251b5e09c1aff0cd/lib/Calendar.php#L83-L150 · [email protected]
EPSS history
Timeline
  • 22 OCT 03:29Z
    EPSS moved — → 0%
    epss
  • 20 OCT 10:41Z
    OpenCATS before 0.10.0 Missing Authorization in Calendar editEvent/deleteEvent
    cvelistv5
  • 20 OCT 10:41Z
    OpenCATS before 0.10.0 Missing Authorization in Calendar editEvent/deleteEvent
    cvelistv5