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

Severity: medium (CVSS 5.4 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-03-27 · updated 2026-10-26
Weakness: CWE-79

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.

References

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

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