XSS in Bytedance Inc. Deerflow
CVE-2026-32859
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.
Vulnerability class: XSS (Cross-Site Scripting)
EPSS: 0.002 (9.7th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N.
Affected products
- Bytedance Inc. Deerflow — versions 0
Weakness classification (CWE)
References
- disclosure@vulncheck.com (issue-tracking)
- disclosure@vulncheck.com (patch)
- disclosure@vulncheck.com (third-party-advisory)
Frequently asked questions
- What is CVE-2026-32859?
- CVE-2026-32859 is a medium-severity vulnerability in Bytedance Inc. Deerflow, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2026-03-27.
- How severe is CVE-2026-32859?
- Medium severity. CVSS v3 base score is 5.4 out of 10.