Vulnerability-Lookup

CVE-2026-33951 (GCVE-0-2026-33951)

Vulnerability from cvelistv5 – Published: 2026-04-02 16:11 – Updated: 2026-04-02 16:21

Title

signalk-server: Unauthenticated Source Priorities Manipulation

Summary

Signal K Server is a server application that runs on a central hub in a boat. Prior to version 2.24.0-beta.1, the SignalK Server exposes an unauthenticated HTTP endpoint that allows remote attackers to modify navigation data source priorities. This endpoint, accessible via PUT /signalk/v1/api/sourcePriorities, does not enforce authentication or authorization checks and directly assigns user-controlled input to the server configuration. As a result, attackers can influence which GPS, AIS, or other sensor data sources are trusted by the system. The changes are immediately applied and persisted to disk, allowing the manipulation to survive server restarts. This issue has been patched in version 2.24.0-beta.1.

Severity ?

6.9 (Medium)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N

CWE

CWE-284 - Improper Access Control
CWE-306 - Missing Authentication for Critical Function

Assigner

GitHub_M

References

URL

Tags

	https://github.com/SignalK/signalk-server/securit…	x_refsource_CONFIRM
	https://github.com/SignalK/signalk-server/release…	x_refsource_MISC

Impacted products

	Vendor	Product	Version
	SignalK	signalk-server	Affected: < 2.24.0-beta.1

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-33951

Vulnerability from fkie_nvd - Published: 2026-04-02 17:16 - Updated: 2026-04-06 15:03

Severity ?

7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/SignalK/signalk-server/releases/tag/v2.24.0-beta.1	Product, Release Notes
	security-advisories@github.com	https://github.com/SignalK/signalk-server/security/advisories/GHSA-gfmv-vh34-h2x5	Vendor Advisory

Impacted products

	Vendor	Product	Version
	signalk	signal_k_server	*

JSON

To clipboard

{
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:signalk:signal_k_server:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "64F9BA25-5552-4477-84F9-83E71B2CA56F",
              "versionEndExcluding": "2.24.0",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Signal K Server is a server application that runs on a central hub in a boat. Prior to version 2.24.0-beta.1, the SignalK Server exposes an unauthenticated HTTP endpoint that allows remote attackers to modify navigation data source priorities. This endpoint, accessible via PUT /signalk/v1/api/sourcePriorities, does not enforce authentication or authorization checks and directly assigns user-controlled input to the server configuration. As a result, attackers can influence which GPS, AIS, or other sensor data sources are trusted by the system. The changes are immediately applied and persisted to disk, allowing the manipulation to survive server restarts. This issue has been patched in version 2.24.0-beta.1."
    }
  ],
  "id": "CVE-2026-33951",
  "lastModified": "2026-04-06T15:03:50.520",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 7.5,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "NONE",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 3.6,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ],
    "cvssMetricV40": [
      {
        "cvssData": {
          "Automatable": "NOT_DEFINED",
          "Recovery": "NOT_DEFINED",
          "Safety": "NOT_DEFINED",
          "attackComplexity": "LOW",
          "attackRequirements": "NONE",
          "attackVector": "NETWORK",
          "availabilityRequirement": "NOT_DEFINED",
          "baseScore": 6.9,
          "baseSeverity": "MEDIUM",
          "confidentialityRequirement": "NOT_DEFINED",
          "exploitMaturity": "NOT_DEFINED",
          "integrityRequirement": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "privilegesRequired": "NONE",
          "providerUrgency": "NOT_DEFINED",
          "subAvailabilityImpact": "NONE",
          "subConfidentialityImpact": "NONE",
          "subIntegrityImpact": "NONE",
          "userInteraction": "NONE",
          "valueDensity": "NOT_DEFINED",
          "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/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",
          "version": "4.0",
          "vulnAvailabilityImpact": "NONE",
          "vulnConfidentialityImpact": "NONE",
          "vulnIntegrityImpact": "LOW",
          "vulnerabilityResponseEffort": "NOT_DEFINED"
        },
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-04-02T17:16:23.200",
  "references": [
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Product",
        "Release Notes"
      ],
      "url": "https://github.com/SignalK/signalk-server/releases/tag/v2.24.0-beta.1"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Vendor Advisory"
      ],
      "url": "https://github.com/SignalK/signalk-server/security/advisories/GHSA-gfmv-vh34-h2x5"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-284"
        },
        {
          "lang": "en",
          "value": "CWE-306"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Primary"
    }
  ]
}

GHSA-GFMV-VH34-H2X5

Vulnerability from github – Published: 2026-04-03 21:42 – Updated: 2026-04-06 23:13

Summary

Signal K Server: Unauthenticated Source Priorities Manipulation

Details

Summary

The SignalK Server exposes an unauthenticated HTTP endpoint that allows remote attackers to modify navigation data source priorities. This endpoint, accessible via PUT /signalk/v1/api/sourcePriorities, does not enforce authentication or authorization checks and directly assigns user-controlled input to the server configuration.

As a result, attackers can influence which GPS, AIS, or other sensor data sources are trusted by the system. The changes are immediately applied and persisted to disk, allowing the manipulation to survive server restarts.

Affected Component

File: src/serverroutes.ts
Endpoint: PUT /signalk/v1/api/sourcePriorities (also accessible at /skServer/sourcePriorities)
Lines: 1064-1076
Function: Source priorities configuration handler

Vulnerable Code

// src/serverroutes.ts - Lines 1064-1076
app.put(
  `${SERVERROUTESPREFIX}/sourcePriorities`,
  (req: Request, res: Response) => {
    app.config.settings.sourcePriorities = req.body
    app.activateSourcePriorities()
    writeSettingsFile(app, app.config.settings, (err: any) => {
      if (err) {
        res
          .status(500)
          .send('Unable to save to sourcePrefences in settings file')
      } else {
        res.json({ result: 'ok' })
      }
    })
  }
)

Vulnerability Characteristics

Missing Authentication: The endpoint has zero authentication middleware, allowing unauthenticated access from any network-adjacent attacker.

Direct Configuration Assignment: User-supplied request body is directly assigned to app.config.settings.sourcePriorities without validation or sanitization.

Persistent Storage: Malicious configuration is written to disk via writeSettingsFile(), ensuring changes survive server restarts. Live Configuration Update: Changes take effect immediately via activateSourcePriorities(), affecting live navigation data processing.

No Input Validation: No JSON schema validation, type checking, or field allowlisting is performed on the request body.

Impact

Navigation Data Manipulation: Attackers can modify source priorities to change which existing, active source's data is being used

Severity ?

7.5 (High)


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

6.9 (Medium)


                  
                    CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "npm",
        "name": "signalk-server"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.24.0-beta.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-33951"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-284",
      "CWE-306"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-04-03T21:42:11Z",
    "nvd_published_at": "2026-04-02T17:16:23Z",
    "severity": "MODERATE"
  },
  "details": "## Summary\n\nThe SignalK Server exposes an unauthenticated HTTP endpoint that allows remote attackers to modify navigation data source priorities. This endpoint, accessible via `PUT /signalk/v1/api/sourcePriorities`, does not enforce authentication or authorization checks and directly assigns user-controlled input to the server configuration.\n\nAs a result, attackers can influence which GPS, AIS, or other sensor data sources are trusted by the system. The changes are immediately applied and persisted to disk, allowing the manipulation to survive server restarts.\n\n### Affected Component\n- **File**: `src/serverroutes.ts`\n- **Endpoint**: `PUT /signalk/v1/api/sourcePriorities` (also accessible at `/skServer/sourcePriorities`)\n- **Lines**: 1064-1076\n- **Function**: Source priorities configuration handler\n\n### Vulnerable Code\n\n```typescript\n// src/serverroutes.ts - Lines 1064-1076\napp.put(\n  `${SERVERROUTESPREFIX}/sourcePriorities`,\n  (req: Request, res: Response) =\u003e {\n    app.config.settings.sourcePriorities = req.body\n    app.activateSourcePriorities()\n    writeSettingsFile(app, app.config.settings, (err: any) =\u003e {\n      if (err) {\n        res\n          .status(500)\n          .send(\u0027Unable to save to sourcePrefences in settings file\u0027)\n      } else {\n        res.json({ result: \u0027ok\u0027 })\n      }\n    })\n  }\n)\n```\n## Vulnerability Characteristics\n\n**Missing Authentication**: The endpoint has zero authentication middleware, allowing unauthenticated access from any network-adjacent attacker.\n\n**Direct Configuration Assignment**: User-supplied request body is directly assigned to app.config.settings.sourcePriorities without validation or sanitization.\n\n**Persistent Storage**: Malicious configuration is written to disk via writeSettingsFile(), ensuring changes survive server restarts.\n**Live Configuration Update**: Changes take effect immediately via activateSourcePriorities(), affecting live navigation data processing.\n\n**No Input Validation**: No JSON schema validation, type checking, or field allowlisting is performed on the request body.\n\n## Impact\n- **Navigation Data Manipulation**: Attackers can modify source priorities to change which existing, active source\u0027s data is being used",
  "id": "GHSA-gfmv-vh34-h2x5",
  "modified": "2026-04-06T23:13:11Z",
  "published": "2026-04-03T21:42:11Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/SignalK/signalk-server/security/advisories/GHSA-gfmv-vh34-h2x5"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-33951"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/SignalK/signalk-server"
    },
    {
      "type": "WEB",
      "url": "https://github.com/SignalK/signalk-server/releases/tag/v2.24.0-beta.1"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Signal K Server: Unauthenticated Source Priorities Manipulation "
}

Sightings

Author	Source	Type	Date

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.

Action not permitted

CVE-2026-33951 (GCVE-0-2026-33951)

FKIE_CVE-2026-33951

GHSA-GFMV-VH34-H2X5

Summary

Affected Component

Vulnerable Code

Vulnerability Characteristics

Impact

Tags

Sightings

Nomenclature