CVE-2026-32859 ByteDance DeerFlow Stored XSS via Inline Artifact Rendering
Attackers can execute arbitrary scripts in users' browsers by uploading malicious artifacts, leading to session compromise and credential theft.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-32859?
CVE-2026-32859 is a medium-severity cross-site scripting vulnerability in Bytedance Inc. DeerFlow, published on 27 Mar 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official 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.
Weakness: CWE-79
Which versions are affected by CVE-2026-32859?
How do I fix CVE-2026-32859?
No fix has been published for CVE-2026-32859 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-32859 being exploited?
There is no known exploitation of CVE-2026-32859 in the wild and no public exploit code.
Sources
Also known as GHSA-36m7-49vh-x3qh.