CVE-2026-73084 Activepieces: Reflected Cross-Site Scripting in OAuth Redirect Endpoint
An attacker can execute arbitrary JavaScript in the Activepieces origin via a crafted OAuth redirect, potentially stealing session tokens or performing actions on behalf of logged-in users.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-73084?
CVE-2026-73084 is a medium-severity cross-site scripting vulnerability in activepieces, published on 11 Aug 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
Activepieces is an open source AI workflow automation platform. Prior to 0.83.0, the /api/redirect OAuth callback endpoint embeds the user-supplied code query parameter directly into an inline script block without proper escaping. A crafted request to /api/redirect with a malicious code value can break out of the script context and execute arbitrary JavaScript in the Activepieces origin when a logged-in user opens it. An unauthenticated attacker can access the victim's session tokens or make authenticated API calls on the victim's behalf. This issue is fixed in version 0.83.0.
Which versions are affected by CVE-2026-73084?
How do I fix CVE-2026-73084?
No fix has been published for CVE-2026-73084 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-2026-73084 being exploited?
There is no known exploitation of CVE-2026-73084 in the wild and no public exploit code.
Sources
Also known as GHSA-hc39-cm5m-q8g7.