RCE in Lockerproject Locker
CVE-2026-3951
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.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N.
EPSS exploit prediction
EPSS: 0.005 (38.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 38th percentile — 38.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.005 · change: +0.002
Affected products
- Lockerproject Locker — versions 0.0.0, 0.0.1, 0.1.0
Weakness classification (CWE)
References
- vuldb.com/ (technical-description, vdb-entry)
- vuldb.com/ (signature, permissions-required)
- vuldb.com/ (third-party-advisory)
- github.com/LockerProject/Locker/issues/963 (issue-tracking)
- github.com/LockerProject/Locker/issues/963 (issue-tracking, exploit)
- github.com/LockerProject/Locker/ (product)
Frequently asked questions
- What is CVE-2026-3951?
- CVE-2026-3951 is a medium-severity vulnerability in Lockerproject Locker, classified under Cross-site Scripting. CVSS score: 4.3/10. Published 2026-03-11.
- How severe is CVE-2026-3951?
- Medium severity. CVSS v3 base score is 4.3 out of 10.