# CVE-2026-125361: Tencent BrowserSkill authentication bypass in daemon socket

Source: https://junglewise.ai/threats/cve-2026-125361-tencent-browserskill-through-0-4-2-contains-a-missing  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-11-10. Updated: 2026-11-10  
License: CC BY 4.0 with a link back

CVE-2026-125361 · Severity: medium · CVSS 6.3 · Published 2026-11-10

Tencent BrowserSkill is a tool that allows AI agents to automate browser tasks while a user is logged in. A flaw in versions up to 0.4.2 allows a local attacker to hijack the daemon's WebSocket by binding to its port before it starts, gaining full control to run arbitrary JavaScript in the user's browser tabs. This could lead to credential theft, session hijacking, or malicious actions taken as the logged-in user.

Vendors: [Tencent](https://junglewise.ai/threats/vendors/tencent).

## Quick answers

**Is CVE-2026-125361 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-125361 being exploited in the wild.

**How severe is CVE-2026-125361?** Medium severity, with a CVSS score of 6.3, published 10 November 2026.

**Which products and versions are affected?** Tencent BrowserSkill through 0.4.2.

**Is there a fix for CVE-2026-125361?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-125361 attacked?** It is attacked with local access, in a software library.

**Am I affected by CVE-2026-125361?** Check whether you run Tencent BrowserSkill at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

The vulnerability exists in the remoteSocket() function, which connects to a loopback WebSocket without verifying the peer's identity or establishing credentials before use. An attacker with local access can race-condition the daemon startup or exploit a gap after daemon exit to bind the port themselves and impersonate the bsk daemon, receiving full tool access including the evaluate function to execute CDP commands in authenticated browser contexts.

## Affected products

- Tencent BrowserSkill through 0.4.2

## Timeline

- 2026-11-10: disclosed

## References

- [https://github.com/Tencent/BrowserSkill](https://github.com/Tencent/BrowserSkill)
- [https://github.com/Tencent/BrowserSkill/blob/ext-v0.4.2/apps/extension/src/transport/remote-endpoint.ts](https://github.com/Tencent/BrowserSkill/blob/ext-v0.4.2/apps/extension/src/transport/remote-endpoint.ts)

## Related threats

- [Tencent BrowserSkill authentication bypass in WebSocket origin validation](https://junglewise.ai/threats/cve-2026-94111-tencent-browserskill-through-0-3-0-contains-an-authentication)