CVE-2026-39970 TypeBot: Stored Cross-Site Scripting (XSS) via SVG File Upload On Profile Picture Form
Attackers can execute arbitrary JavaScript in victims' browsers by uploading malicious SVG files, leading to session theft and account takeover.
- 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-2026-39970?
CVE-2026-39970 is a high-severity cross-site scripting vulnerability in baptisteArno typebot.io, published on 22 May 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
TypeBot is a chatbot builder tool. Versions 3.15.2 and prior contain a critical stored XSS vulnerability in the app.typebot.io profile picture upload form. The application fails to sanitize or restrict SVG/XML-based uploads and directly renders them when accessed through the domain. By uploading a crafted malicious SVG file containing embedded JavaScript, an attacker will execute arbitrary JavaScript code. This vulnerability directly enables stored XSS exploitation because the payload is persistently stored on your infrastructure (app.typebot.io) and accessible from a public-facing, permanent link. Stored XSS via malicious SVG uploads to app.typebot.io allows attackers to execute arbitrary JavaScript in victims' browsers, enabling session/token theft, account takeover, and exfiltration of sensitive user data. This issue has been fixed in version 3.16.0.
Weakness: CWE-79
Which versions are affected by CVE-2026-39970?
How do I fix CVE-2026-39970?
No fix has been published for CVE-2026-39970 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-2026-39970 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-39970 exists.
Sources
Also known as GHSA-jj87-c343-26vp.