# CVE-2026-113349: OpenCATS authorization bypass in calendar event management

Source: https://junglewise.ai/threats/cve-2026-113349-opencats-before-0-10-0-contains-a-missing-authorization  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-20. Updated: 2026-10-20  
License: CC BY 4.0 with a link back

CVE-2026-113349 · Severity: medium · CVSS 4.3 · Published 2026-10-20

OpenCATS is a recruiting and applicant tracking system that manages calendar events for team scheduling. A flaw in the calendar event editing and deletion functions allows authenticated users to modify or delete other users' private calendar events by supplying arbitrary event IDs, compromising event data integrity and team coordination.

Technologies: [OpenCATS](https://junglewise.ai/threats/technologies/opencats). Vendors: [OpenCATS](https://junglewise.ai/threats/vendors/opencats).

## Quick answers

**Is CVE-2026-113349 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-113349 being exploited in the wild.

**How severe is CVE-2026-113349?** Medium severity, with a CVSS score of 4.3, published 20 October 2026.

**Which products and versions are affected?** OpenCATS before 0.10.0.

**Is there a fix for CVE-2026-113349?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-113349 attacked?** It is attacked over the network, in a web application.

**Am I affected by CVE-2026-113349?** Check whether you run OpenCATS at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

A missing authorization check in CalendarUI::onEditEvent() and onDeleteEvent() methods fails to verify that the requesting user owns the calendar event before allowing modification or deletion. An authenticated attacker with EDIT or DELETE permissions can supply arbitrary eventID values to target and modify any user's events, including those restricted to specific owners, without additional authentication or user interaction.

## Affected products

- OpenCATS OpenCATS before 0.10.0

## Timeline

- 2026-10-20: disclosed

## References

- [https://github.com/opencats/OpenCATS/blob/5781f41814f09493c7ce05b9251b5e09c1aff0cd/lib/Calendar.php](https://github.com/opencats/OpenCATS/blob/5781f41814f09493c7ce05b9251b5e09c1aff0cd/lib/Calendar.php)
- [https://github.com/opencats/OpenCATS/blob/5781f41814f09493c7ce05b9251b5e09c1aff0cd/modules/calendar/CalendarUI.php](https://github.com/opencats/OpenCATS/blob/5781f41814f09493c7ce05b9251b5e09c1aff0cd/modules/calendar/CalendarUI.php)

## Related threats

- [OpenCATS authenticated SQL injection in date filtering](https://junglewise.ai/threats/cve-2026-54455-opencats-is-an-open-source-applicant-tracking-system-and)
- [OpenCATS code injection in Professional License configuration](https://junglewise.ai/threats/cve-2026-54453-opencats-is-an-open-source-applicant-tracking-system-and)
- [OpenCATS stored cross-site scripting in MRU navigation panel](https://junglewise.ai/threats/cve-2026-115513-opencats-before-0-12-0-contains-a-stored-cross-site-scripting)
- [OpenCATS missing authorization in reports module](https://junglewise.ai/threats/cve-2026-112787-opencats-before-0-10-0-contains-a-missing-authorization)
- [OpenCATS missing authorization in import rollback](https://junglewise.ai/threats/cve-2026-112786-opencats-before-0-10-0-contains-a-missing-authorization)