CVE-2026-2709 busy Callback app.js redirect
Attackers can exploit an open redirect in the busy application's callback handler to redirect users to malicious sites.
- 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-2026-2709?
CVE-2026-2709 is a medium-severity vulnerability in busy, published on 19 Feb 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
A flaw has been found in busy up to 2.5.5. The affected element is an unknown function of the file source-code/busy-master/src/server/app.js of the component Callback Handler. Executing a manipulation of the argument state can lead to open redirect. It is possible to launch the attack remotely. The exploit has been published and may be used. The project was informed of the problem early through an issue report but has not responded yet.
Weakness: CWE-601
Which versions are affected by CVE-2026-2709?
How do I fix CVE-2026-2709?
No fix has been published for CVE-2026-2709 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-2709 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-2709 exists.
Sources
Also known as GHSA-pc7g-8v63-q7v6.