Vulnerability-Lookup

CVE-2025-71389 (GCVE-0-2025-71389)

Vulnerability from cvelistv5 – Published: 2026-07-23 21:16 – Updated: 2026-07-23 21:16

Title

Cal.com before 5.9.9 Remote Code Execution via RSC

Summary

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.

Severity

10 (Critical)


                        
                          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

10 (Critical)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

CWE

CWE-94 - Improper Control of Generation of Code ('Code Injection')

Assigner

VulnCheck

References

4 references

URL	Tags
https://github.com/calcom/cal.diy/security/adviso…	vendor-advisory
https://github.com/calcom/cal.diy/pull/25592	issue-tracking
https://github.com/advisories/GHSA-9qr9-h5gf-34mp	related
https://www.vulncheck.com/advisories/cal-com-befo…	third-party-advisory

Impacted products

1 product

Vendor	Product	Version
calcom	cal.diy	Affected: 0 , < 5.9.9 (semver) Unaffected: 5.9.9 (semver)

Date Public

2025-12-07 00:00

Show details on NVD website

JSON

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "cal.diy",
          "vendor": "calcom",
          "versions": [
            {
              "lessThan": "5.9.9",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "5.9.9",
              "versionType": "semver"
            }
          ]
        }
      ],
      "datePublic": "2025-12-07T00:00:00.000Z",
      "descriptions": [
        {
          "lang": "en",
          "value": "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."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "attackVector": "NETWORK",
            "baseScore": 10,
            "baseSeverity": "CRITICAL",
            "privilegesRequired": "NONE",
            "subAvailabilityImpact": "HIGH",
            "subConfidentialityImpact": "HIGH",
            "subIntegrityImpact": "HIGH",
            "userInteraction": "NONE",
            "vectorString": "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": "4.0",
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            "vulnConfidentialityImpact": "HIGH",
            "vulnIntegrityImpact": "HIGH"
          },
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        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
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            "baseSeverity": "CRITICAL",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "CHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H",
            "version": "3.1"
          },
          "format": "CVSS"
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-94",
              "description": "Improper Control of Generation of Code (\u0027Code Injection\u0027)",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-23T21:16:44.870Z",
        "orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
        "shortName": "VulnCheck"
      },
      "references": [
        {
          "name": "GitHub Security Advisory (GHSA-qjx2-5xqp-cpf4)",
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://github.com/calcom/cal.diy/security/advisories/GHSA-qjx2-5xqp-cpf4"
        },
        {
          "name": "Patch (PR #25592)",
          "tags": [
            "issue-tracking"
          ],
          "url": "https://github.com/calcom/cal.diy/pull/25592"
        },
        {
          "name": "Upstream Next.js advisory (CVE-2025-55182)",
          "tags": [
            "related"
          ],
          "url": "https://github.com/advisories/GHSA-9qr9-h5gf-34mp"
        },
        {
          "name": "VulnCheck Advisory: Cal.com before 5.9.9 Remote Code Execution via RSC",
          "tags": [
            "third-party-advisory"
          ],
          "url": "https://www.vulncheck.com/advisories/cal-com-before-remote-code-execution-via-rsc"
        }
      ],
      "title": "Cal.com before 5.9.9 Remote Code Execution via RSC",
      "x_generator": {
        "engine": "vulncheck-endgame"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
    "assignerShortName": "VulnCheck",
    "cveId": "CVE-2025-71389",
    "datePublished": "2026-07-23T21:16:44.870Z",
    "dateReserved": "2026-07-16T12:14:41.769Z",
    "dateUpdated": "2026-07-23T21:16:44.870Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
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      "date": "2026-07-24",
      "epss": "0.00928",
      "percentile": "0.56819"
    },
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  }
}

GHSA-8449-9VW6-7MP5

Vulnerability from github – Published: 2026-07-24 00:32 – Updated: 2026-07-24 00:32

Details

Severity

10.0 (Critical)


                  
                    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

10.0 (Critical)


                  
                    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

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2025-71389"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-94"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-07-23T22:16:51Z",
    "severity": "CRITICAL"
  },
  "details": "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.",
  "id": "GHSA-8449-9vw6-7mp5",
  "modified": "2026-07-24T00:32:33Z",
  "published": "2026-07-24T00:32:33Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/calcom/cal.diy/security/advisories/GHSA-qjx2-5xqp-cpf4"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-71389"
    },
    {
      "type": "WEB",
      "url": "https://github.com/calcom/cal.diy/pull/25592"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/advisories/GHSA-9qr9-h5gf-34mp"
    },
    {
      "type": "WEB",
      "url": "https://www.vulncheck.com/advisories/cal-com-before-remote-code-execution-via-rsc"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "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": "CVSS_V4"
    }
  ]
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.

Action not permitted

CVE-2025-71389 (GCVE-0-2025-71389)

GHSA-8449-9VW6-7MP5

Tags

Sightings

Nomenclature