---
id: CVE-2026-112783
title: OpenCATS before 0.10.0 Missing Authorization via Activity AJAX Endpoints
summary: >-
  OpenCATS before 0.10.0 contains a missing authorization vulnerability in
  ajax/deleteActivity.php and ajax/editActivity.php that allows READ-level users
  to edit and delete activity entries. Authenticated attackers can supply an
  arbitrary …
severity: medium
cvss: 4.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N'
cvssSource: cna
cwe:
  - CWE-862
vendor: opencats
product: OpenCATS
affected:
  - OpenCATS < 0.10.0
published: '2026-10-20'
updated: '2026-10-20'
sourceUpdated: '2026-10-20T10:41:32.643Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-112783'
references:
  - url: 'https://github.com/opencats/OpenCATS/issues/720'
  - url: >-
      https://github.com/opencats/OpenCATS/commit/aa3b414c3672f5010ca26c44192aa8e72d3735bd
  - url: 'https://github.com/opencats/OpenCATS/releases/tag/v0.10.0'
    label: OpenCATS v0.10.0 Release Notes
  - url: >-
      https://github.com/opencats/OpenCATS/blob/5781f41814f09493c7ce05b9251b5e09c1aff0cd/ajax/deleteActivity.php
  - url: >-
      https://github.com/opencats/OpenCATS/blob/5781f41814f09493c7ce05b9251b5e09c1aff0cd/ajax/editActivity.php
  - url: >-
      https://www.vulncheck.com/advisories/opencats-before-0.10.0-missing-authorization-via-activity-ajax-endpoints
    label: >-
      VulnCheck Advisory: OpenCATS before 0.10.0 Missing Authorization via
      Activity AJAX Endpoints
tags:
  - cve.org
ingestedAt: '2026-10-20T12:05:07.341Z'
---

## Overview

OpenCATS before 0.10.0 contains a missing authorization vulnerability in ajax/deleteActivity.php and ajax/editActivity.php that allows READ-level users to edit and delete activity entries. Authenticated attackers can supply an arbitrary activityID via GET or POST to modify or delete activity and pipeline history for candidates, contacts and companies.

## Affected

- `OpenCATS < 0.10.0`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.