CVE-2026-113349

Medium

Description

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.

SeverityMedium

CVSS4.3

Exploit probability—

ProductOpenCATS

PublishedOct 20, 2026

First seenOct 20, 2026

Weakness typeCWE-639Authorization bypass through user-controlled key

How to fix

Update

opencats OpenCATS0.10.0 or later

Patches

github.com/opencats/OpenCATS/commit/aa3b414c3672f5010ca26c44192aa8e72d3735bd

Vendor advisories

github.com/opencats/OpenCATS/releases/tag/v0.10.0

Affected products

Product	Affected versions	Fixed in
opencats OpenCATS	v < 0.10.0	0.10.0

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