CVE-2026-3958 Woahai321 ListSync JSON api_server.py requests.post server-side request forgery
Remote attackers can exploit a server-side request forgery vulnerability in ListSync to interact with internal services or bypass security controls.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-3958?
CVE-2026-3958 is a medium-severity server-side request forgery vulnerability in Woahai321 ListSync, published on 11 Mar 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
A vulnerability has been found in Woahai321 ListSync up to 0.6.6. This issue affects the function requests.post of the file list-sync-main/api_server.py of the component JSON Handler. The manipulation leads to server-side request forgery. The attack is possible to be carried out remotely. The exploit has been disclosed to the public and may be used. The project was informed of the problem early through an issue report but has not responded yet.
Weakness: CWE-918
Which versions are affected by CVE-2026-3958?
How do I fix CVE-2026-3958?
No fix has been published for CVE-2026-3958 yet. Limit exposure of the affected software until one is available.
Upgrade, and send outbound requests through an allow-list that blocks internal addresses. More about Server-side request forgery.
Is CVE-2026-3958 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-3958 exists.
Sources
Also known as GHSA-jhf5-cppx-wj5h.