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CVE-2026-57858: Cal.com Self-Hosted (Cal.diy) 2.1.1 through 6.2.0
CVE-2026-57858. CVSS 3.1 base score 8.9 (HIGH, Vendor/CNA). EPSS 0.0037 (percentile 0.29716), scored 22-Oct-2026.
Affected technology
Cal.com Self-Hosted (Cal.diy) · 2.1.1 through 6.2.0
Cal.com
Description’s affected range: versions 2.1.1 through 6.2.0
Component: Not specified by the source
Attack conditions (Vendor/CNA, CVSS 4.0): Network (remote) · Low privileges required · Active user interaction
What an attacker can do
Attackers can close the inline script string literal with a crafted payload that executes in the browser of every visitor to the affected public booking page, enabling session cookie theft, forged authenticated requests, and wormable propagation by chaining with CSRF-able endpoints to persist payloads on additional events. Vendor/CNA’s CVSS 4.0 assessment (base score 9.3/10) rates confidentiality and integrity impact as high; availability impact as low.
- CWE
- CWE-79
- CCR priority
- 35.7 /100 (P4)
- CVSS 3.1
- 8.9 /10 · CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:L · Vendor/CNA
- EPSS
- 0.0037 · percentile 0.29716 · 2026-10-22
- KEV
- no
Provenance
- NVD CVE API 2.0 · Source record · observed 2026-10-24 01:40:49.068977+00:00 UTC
Stable permalink: https://cybercodered.org/item/cve-cve-2026-57858.html