CVE-2026-125361

MEDIUM 6.3

Tencent BrowserSkill through 0.4.2 Missing Authentication in Local WebSocket Transport

CVSS Score

6.3

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-923
Vendor	tencent
Product	browserskill
Published	Nov 9, 2026

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CVSS v3 Breakdown

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

Attack Vector

Local

Attack Complexity

High

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

None

Affected Versions

Tencent / BrowserSkill

0 ≤ 0.4.2

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/Tencent/BrowserSkill/issues/402 github.com: https://github.com/Tencent/BrowserSkill github.com: https://github.com/Tencent/BrowserSkill/blob/ext-v0.4.2/apps/extension/src/transport/remote-endpoint.ts#L79-L85 github.com: https://github.com/Tencent/BrowserSkill/commit/7e862a44d19d0c1e492901fe29562cc7d79af590 vulncheck.com: https://www.vulncheck.com/advisories/tencent-browserskill-through-0.4.2-missing-authentication-in-local-websocket-transport

Credits

George Chen