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CVE-2026-9349— calcom cal.diy Generic React API bookings-single-view.getServerSideProps.tsx getServerSideProps information disclosure

Quick assessment

Affected
calcom cal.diy
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.

cal.diy是Cal开源的一个开源日程调度平台。 cal.diy 4.9.4及之前版本存在访问控制错误漏洞，该漏洞源于Generic React API组件文件apps/web/modules/bookings/views/bookings-single-view.getServerSideProps.tsx中函数getServerSideProps对参数cancelledBy/rescheduledBy的操作，可能导致信息泄露。

CVSS 5.3 · Medium EPSS 0.53% · P42

Possible ATT&CK Techniques 1 AI

T1530 · Data from Cloud Storage

Affected Version Matrix 5

VendorProduct Version RangeStatus
calcom cal.diy 4.9.0 affected
4.9.1 affected
4.9.2 affected
4.9.3 affected
4.9.4 affected
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I. Basic Information for CVE-2026-9349

Vulnerability Information
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Vulnerability Title
calcom cal.diy Generic React API bookings-single-view.getServerSideProps.tsx getServerSideProps information disclosure
Source: CVE Program / CVE List V5
Vulnerability Description
A vulnerability was determined in calcom cal.diy up to 4.9.4. Affected by this issue is the function getServerSideProps of the file apps/web/modules/bookings/views/bookings-single-view.getServerSideProps.tsx of the component Generic React API. This manipulation of the argument cancelledBy/rescheduledBy causes information disclosure. The attack can be initiated remotely. The exploit has been publicly disclosed and may be utilized. The vendor was contacted early about this disclosure but did not respond in any way.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
信息暴露
Source: CVE Program / CVE List V5
Vulnerability Title
cal.diy 访问控制错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
cal.diy是Cal开源的一个开源日程调度平台。 cal.diy 4.9.4及之前版本存在访问控制错误漏洞，该漏洞源于Generic React API组件文件apps/web/modules/bookings/views/bookings-single-view.getServerSideProps.tsx中函数getServerSideProps对参数cancelledBy/rescheduledBy的操作，可能导致信息泄露。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
calcom cal.diy 4.9.0 cpe:2.3:a:calcom:cal.diy:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-9349

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III. Intelligence Information for CVE-2026-9349

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Proof of Concept for CVE-2026-9349 (1)

IV. Related Vulnerabilities

Same product: cal.diy
Same vendor: calcom
Same weakness: CWE-200

V. Comments for CVE-2026-9349

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