# 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.

- **Severity:** Medium 5.3 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P`)
- **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 available:** No
- **Published:** 11 Mar 2026
- **Updated:** 12 Mar 2026
- **Also known as:** GHSA-65vh-gvwg-89vf

## 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.

Weakness: CWE-94 (Improper Control of Generation of Code), CWE-79 (Improper Neutralization of Input During Web Page Generation)

## 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.

## Is CVE-2026-3951 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-3951 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-3951 and fix it if it is affected.

What it is: 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.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-3951 exists.

Affected product: LockerProject Locker. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-3951/ (Markdown: https://insights.sbomify.com/CVE-2026-3951/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-3951
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-3951
- OSV: https://osv.dev/vulnerability/CVE-2026-3951

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-3951/
Summaries are generated and may contain mistakes; the official description above is the record.