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CVE-2025-71389

Cal.com before 5.9.9 Remote Code Execution via RSC

Published: Jul 23, 2026Updated: Jul 24, 2026 Sources: CVE List NVDCWE-94
10.0CRITICAL
NVD MITRE
EPSS Score
0.9%
Top 43.1%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
No Fix Available
Self-Check
Not available

Description

Cal.com (calcom/cal.diy) before 5.9.9 is vulnerable to unauthenticated remote code execution because it bundles a version of Next.js whose React Server Components (RSC) request handling deserializes attacker-controlled input. A remote attacker can send a crafted RSC request to the server and cause arbitrary code to be executed during server-side processing, without authentication or user interaction. The flaw derives from the upstream Next.js vulnerability CVE-2025-55182 and is resolved in 5.9.9 by updating the affected dependency.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:CC:HI:HA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:CScope
Changed
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High
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Weaknesses

CWE-94

Affected Products

calcom
commercialaka cal.com
cal.diySaaS
Cloud & SaaS / saas-application

Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.
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Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

2 techniques
Execution
Initial Access
View detailed technique mapping

References

https://github.com/calcom/cal.diy/security/advisories/GHSA-qjx2-5xqp-cpf4
github.com
https://github.com/calcom/cal.diy/pull/25592
github.com
https://github.com/advisories/GHSA-9qr9-h5gf-34mp
github.com
and 1 more references View all →

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