CVE-2026-125361 (GCVE-0-2026-125361)

Vulnerability from cvelistv5 – Published: 2026-11-09 23:27 – Updated: 2026-11-09 23:27
VLAI
Title
Tencent BrowserSkill through 0.4.2 Missing Authentication in Local WebSocket Transport
Summary
Tencent BrowserSkill through 0.4.2 contains a missing authentication vulnerability that allows local attackers to impersonate the bsk daemon because remoteSocket() connects to the loopback WebSocket without credentials or peer verification. Attackers who bind the daemon port before it starts or after it exits receive the extension's full tool surface, including evaluate, to run JavaScript through CDP in logged-in browser tabs.
Severity
7.2 (High)
CVSS:4.0/AV:L/AC:H/AT:P/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
6.3 (Medium)
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N
CWE
  • CWE-923 - Improper Restriction of Communication Channel to Intended Endpoints
Assigner
VulnCheck CNA
References
Impacted products
Vendor Product Version
Tencent BrowserSkill Affected: 0 , ≤ 0.4.2 (semver)
Create a notification for this product.
Date Public
2026-10-05 00:00
Credits
George Chen
Show details on NVD website
To clipboard 

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "packageURL": "pkg:npm/browser-skill",
          "product": "BrowserSkill",
          "vendor": "Tencent",
          "versions": [
            {
              "lessThanOrEqual": "0.4.2",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "George Chen"
        }
      ],
      "datePublic": "2026-10-05T00:00:00.000Z",
      "descriptions": [
        {
          "lang": "en",
          "value": "Tencent BrowserSkill through 0.4.2 contains a missing authentication vulnerability that allows local attackers to impersonate the bsk daemon because remoteSocket() connects to the loopback WebSocket without credentials or peer verification. Attackers who bind the daemon port before it starts or after it exits receive the extension\u0027s full tool surface, including evaluate, to run JavaScript through CDP in logged-in browser tabs."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "attackComplexity": "HIGH",
            "attackRequirements": "PRESENT",
            "attackVector": "LOCAL",
            "baseScore": 7.2,
            "baseSeverity": "HIGH",
            "privilegesRequired": "LOW",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "NONE",
            "vectorString": "CVSS:4.0/AV:L/AC:H/AT:P/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N",
            "version": "4.0",
            "vulnAvailabilityImpact": "NONE",
            "vulnConfidentialityImpact": "HIGH",
            "vulnIntegrityImpact": "HIGH"
          },
          "format": "CVSS"
        },
        {
          "cvssV3_1": {
            "attackComplexity": "HIGH",
            "attackVector": "LOCAL",
            "availabilityImpact": "NONE",
            "baseScore": 6.3,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N",
            "version": "3.1"
          },
          "format": "CVSS"
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      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-923",
              "description": "Improper Restriction of Communication Channel to Intended Endpoints",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-11-09T23:27:34.958Z",
        "orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
        "shortName": "VulnCheck"
      },
      "references": [
        {
          "name": "GitHub Issue #402",
          "tags": [
            "issue-tracking"
          ],
          "url": "https://github.com/Tencent/BrowserSkill/issues/402"
        },
        {
          "tags": [
            "product"
          ],
          "url": "https://github.com/Tencent/BrowserSkill"
        },
        {
          "tags": [
            "technical-description"
          ],
          "url": "https://github.com/Tencent/BrowserSkill/blob/ext-v0.4.2/apps/extension/src/transport/remote-endpoint.ts#L79-L85"
        },
        {
          "tags": [
            "patch"
          ],
          "url": "https://github.com/Tencent/BrowserSkill/commit/7e862a44d19d0c1e492901fe29562cc7d79af590"
        },
        {
          "name": "VulnCheck Advisory: Tencent BrowserSkill through 0.4.2 Missing Authentication in Local WebSocket Transport",
          "tags": [
            "third-party-advisory"
          ],
          "url": "https://www.vulncheck.com/advisories/tencent-browserskill-through-0.4.2-missing-authentication-in-local-websocket-transport"
        }
      ],
      "title": "Tencent BrowserSkill through 0.4.2 Missing Authentication in Local WebSocket Transport",
      "x_generator": {
        "engine": "vulncheck-endgame"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
    "assignerShortName": "VulnCheck",
    "cveId": "CVE-2026-125361",
    "datePublished": "2026-11-09T23:27:34.958Z",
    "dateReserved": "2026-11-09T22:03:00.581Z",
    "dateUpdated": "2026-11-09T23:27:34.958Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}



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