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Vulnerability Details :

CVE-2025-71389

Summary
Assigner-VulnCheck
Assigner Org ID-83251b91-4cc7-4094-a5c7-464a1b83ea10
Published At-23 Jul, 2026 | 21:16
Updated At-24 Jul, 2026 | 22:07
Rejected At-
Credits

Cal.com before 5.9.9 Remote Code Execution via RSC

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.

Vendors
-
Not available
Products
-
Metrics (CVSS)
VersionBase scoreBase severityVector
Weaknesses
Attack Patterns
Solution/Workaround
References
HyperlinkResource Type
EPSS History
Score
Latest Score
-
N/A
No data available for selected date range
Percentile
Latest Percentile
-
N/A
No data available for selected date range
Stakeholder-Specific Vulnerability Categorization (SSVC)
â–¼Common Vulnerabilities and Exposures (CVE)
cve.org
Assigner:VulnCheck
Assigner Org ID:83251b91-4cc7-4094-a5c7-464a1b83ea10
Published At:23 Jul, 2026 | 21:16
Updated At:24 Jul, 2026 | 22:07
Rejected At:
â–¼CVE Numbering Authority (CNA)
Cal.com before 5.9.9 Remote Code Execution via RSC

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.

Affected Products
Vendor
calcom
Product
cal.diy
Default Status
unaffected
Versions
Affected
  • From 0 before 5.9.9 (semver)
Unaffected
  • 5.9.9 (semver)
Problem Types
TypeCWE IDDescription
CWECWE-94Improper Control of Generation of Code ('Code Injection')
Type: CWE
CWE ID: CWE-94
Description: Improper Control of Generation of Code ('Code Injection')
Metrics
VersionBase scoreBase severityVector
4.010.0CRITICAL
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
3.110.0CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Version: 4.0
Base score: 10.0
Base severity: CRITICAL
Vector:
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
Version: 3.1
Base score: 10.0
Base severity: CRITICAL
Vector:
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions

Configurations

Workarounds

Exploits

Credits

Timeline
EventDate
Replaced By

Rejected Reason

References
HyperlinkResource
https://github.com/calcom/cal.diy/security/advisories/GHSA-qjx2-5xqp-cpf4
vendor-advisory
https://github.com/calcom/cal.diy/pull/25592
issue-tracking
patch
https://github.com/advisories/GHSA-9qr9-h5gf-34mp
related
https://www.vulncheck.com/advisories/cal-com-before-remote-code-execution-via-rsc
third-party-advisory
Hyperlink: https://github.com/calcom/cal.diy/security/advisories/GHSA-qjx2-5xqp-cpf4
Resource:
vendor-advisory
Hyperlink: https://github.com/calcom/cal.diy/pull/25592
Resource:
issue-tracking
patch
Hyperlink: https://github.com/advisories/GHSA-9qr9-h5gf-34mp
Resource:
related
Hyperlink: https://www.vulncheck.com/advisories/cal-com-before-remote-code-execution-via-rsc
Resource:
third-party-advisory
â–¼Authorized Data Publishers (ADP)
CISA ADP Vulnrichment
Affected Products
Metrics
VersionBase scoreBase severityVector
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions

Configurations

Workarounds

Exploits

Credits

Timeline
EventDate
Replaced By

Rejected Reason

References
HyperlinkResource
Information is not available yet
â–¼National Vulnerability Database (NVD)
nvd.nist.gov
Source:disclosure@vulncheck.com
Published At:23 Jul, 2026 | 22:16
Updated At:24 Jul, 2026 | 23:16

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.

CISA Catalog
Date AddedDue DateVulnerability NameRequired Action
N/A
Date Added: N/A
Due Date: N/A
Vulnerability Name: N/A
Required Action: N/A
Metrics
TypeVersionBase scoreBase severityVector
Secondary4.010.0CRITICAL
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Secondary3.110.0CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
N/A
Type: Secondary
Version: 4.0
Base score: 10.0
Base severity: CRITICAL
Vector:
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Type: Secondary
Version: 3.1
Base score: 10.0
Base severity: CRITICAL
Vector:
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Type: N/A
Version:
Base score:
Base severity: N/A
Vector:
CPE Matches

Weaknesses
CWE IDTypeSource
CWE-94Secondarydisclosure@vulncheck.com
CWE ID: CWE-94
Type: Secondary
Source: disclosure@vulncheck.com
Evaluator Description

Evaluator Impact

Evaluator Solution

Vendor Statements

References
HyperlinkSourceResource
https://github.com/advisories/GHSA-9qr9-h5gf-34mpdisclosure@vulncheck.com
N/A
https://github.com/calcom/cal.diy/pull/25592disclosure@vulncheck.com
N/A
https://github.com/calcom/cal.diy/security/advisories/GHSA-qjx2-5xqp-cpf4disclosure@vulncheck.com
N/A
https://www.vulncheck.com/advisories/cal-com-before-remote-code-execution-via-rscdisclosure@vulncheck.com
N/A
Hyperlink: https://github.com/advisories/GHSA-9qr9-h5gf-34mp
Source: disclosure@vulncheck.com
Resource: N/A
Hyperlink: https://github.com/calcom/cal.diy/pull/25592
Source: disclosure@vulncheck.com
Resource: N/A
Hyperlink: https://github.com/calcom/cal.diy/security/advisories/GHSA-qjx2-5xqp-cpf4
Source: disclosure@vulncheck.com
Resource: N/A
Hyperlink: https://www.vulncheck.com/advisories/cal-com-before-remote-code-execution-via-rsc
Source: disclosure@vulncheck.com
Resource: N/A

Change History

0
Information is not available yet

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