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CVE-2026-113349— OpenCATS before 0.10.0 Missing Authorization in Calendar editEvent/deleteEvent

Quick assessment

Affected
opencats OpenCATS
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

OpenCATS 0.10.0 之前的版本在 和 函数中存在授权缺失漏洞，允许已认证用户修改或删除其他用户的日历事件。拥有编辑（EDIT）或删除（DELETE）权限的攻击者可以提交任意的事件 ID（eventID），从而篡改或删除任何用户的事件，包括仅限所有者访问的非公开事件。

CVSS 4.3 · Medium
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I. Basic Information for CVE-2026-113349

Vulnerability Information
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Vulnerability Title
OpenCATS before 0.10.0 Missing Authorization in Calendar editEvent/deleteEvent
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
通过用户控制密钥绕过授权机制
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
opencats OpenCATS 0 ~ 0.10.0 -

II. Public POCs for CVE-2026-113349

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III. Intelligence Information for CVE-2026-113349

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Patches & Fixes for CVE-2026-113349 (2)

Vendor Advisories for CVE-2026-113349 (1)

Proof of Concept for CVE-2026-113349 (1)

Vendor Pages for CVE-2026-113349 (1)

Same Patch Batch · opencats · 2026-10-20 · 6 CVEs total

CVE-2026-112786 5.4 MEDIUM OpenCATS before 0.10.0 Missing Authorization via Import Revert Action
CVE-2026-112787 4.3 MEDIUM OpenCATS before 0.10.0 Missing Authorization in Reports Module EEO Reports
CVE-2026-112783 4.3 MEDIUM OpenCATS before 0.10.0 Missing Authorization via Activity AJAX Endpoints
CVE-2026-112784 4.3 MEDIUM OpenCATS before 0.10.0 Missing Authorization via ajax/testEmailSettings.php
CVE-2026-112785 4.3 MEDIUM OpenCATS before 0.10.0 Missing Authorization in Saved-List AJAX Endpoints

IV. Related Vulnerabilities

Same product: OpenCATS
Same vendor: opencats
Same weakness: CWE-639

V. Comments for CVE-2026-113349

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