CVE-2026-3951 LockerProject Locker Error Response registry.js authIsAwesome cross site scripting
Remote attackers can execute arbitrary scripts via the authIsAwesome function in LockerProject Locker, potentially leading to session hijacking or data theft.
- 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-2026-3951?
CVE-2026-3951 is a medium-severity cross-site scripting vulnerability in LockerProject Locker, published on 11 Mar 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
A security flaw has been discovered in LockerProject Locker 0.0.0/0.0.1/0.1.0. Affected is the function authIsAwesome of the file source-code/Locker-master/Ops/registry.js of the component Error Response Handler. The manipulation of the argument ID results in cross site scripting. The attack can be launched remotely. The exploit has been released to the public and may be used for attacks. The project was informed of the problem early through an issue report but has not responded yet.
Which versions are affected by CVE-2026-3951?
How do I fix CVE-2026-3951?
No fix has been published for CVE-2026-3951 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-2026-3951 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-3951 exists.
Sources
Also known as GHSA-65vh-gvwg-89vf.