TI-2026-66048 Aliases CVE-2026-104054 GHSA-48q5-8whv-r6xj

calcom cal.diy PBAC Permission BookingAccessService.ts doesUserIdHaveAccessToBooking authorization

MEDIUM 57CWE-862Published 2026-10-02 · Updated 2026-10-02

Key facts

Attack vector: Network
Privileges required: Low
User interaction: None
Attack complexity: Low
Attack requirements: None
Impact type: Security bypass
Confidentiality · integrity · availability: Low · Low · Low
Fix status: No fix listed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-862.

Summary

A security flaw has been discovered in calcom cal.diy up to 6.2.0. This affects the function doesUserIdHaveAccessToBooking of the file BookingAccessService.ts of the component PBAC Permission Engine. Performing a manipulation results in missing authorization. The attack can be initiated remotely. The exploit has been released to the public and may be used for attacks. The pull request to fix this issue awaits acceptance.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.00209 11th percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by the CNA

Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: Poc
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
calcom	cal.diy	6.0; 6.1; 6.2.0	—	No fix listed	CNA

cal.diy Vendorcalcom Affected 6.0; 6.1; 6.2.0 Fixed in — No fix listed CNA

CPE names CNA · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:calcom:cal.diy::::::::	—	—	—

cpe:2.3:a:calcom:cal.diy:*:*:*:*:*:*:*:* Versions — — ·—

Remediation

No fixed version listed by the sources yet.

Timeline

2026-10-02 Threatist record created from CVE-2026-104054
2026-10-03 Alias added: GHSA-48q5-8whv-r6xj

References

TI-2024-38439 Cal.com through 4.7.15 Cross-Site Scripting via booking questions CVSS 4.0CRITICAL 9.3
TI-2024-38437 Cal.com through 4.7.15 Cross-Site Scripting via booking questions CVSS 4.0CRITICAL 9.3
TI-2024-38438 cal.com Repository Takeover via pull_request_target Workflow CVSS 4.0HIGH 8.5
TI-2026-08199 calcom cal.diy Generic React API bookings-single-view.getServerSideProps.tsx getServerSideProps information disclosure CVSS 4.0MEDIUM 6.9
TI-2023-19352 Cal.com not expiring old sessions after enabling 2FA CVSS 3.1MEDIUM 6.5
TI-2026-76231 Authorization bypass in cal.com and cal.diy webhook handler CVSS 4.0MEDIUM 5.3

See all 14 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences