How severe is CVE-2026-3951?

CVE-2026-3951 has a CVSS 3.x base score of 4.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity low, and availability none.

Is CVE-2026-3951 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (21st percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2026-3951?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-3951 have an EU (EUVD) identifier?

Yes. CVE-2026-3951 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-11347.

When was CVE-2026-3951 published?

CVE-2026-3951 was published on 2026-03-11 and last updated on 2026-06-17.

CVE-2026-3951

CVE-2026-3951 is a medium-severity vulnerability with a CVSS 3.x base score of 4.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-79.

Key facts

Severity: Medium (CVSS 3.x base score 4.3)
CVSS v2: 5.0
CVSS v4: 2.1
EPSS exploit prediction: 0% (21st percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-11347
Weakness: CWE-79
Published: 2026-03-11
Last modified: 2026-06-17

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.

Frequently asked questions

What is 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.
How severe is CVE-2026-3951?: CVE-2026-3951 has a CVSS 3.x base score of 4.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity low, and availability none.
Is CVE-2026-3951 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (21st percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2026-3951?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-3951 have an EU (EUVD) identifier?: Yes. CVE-2026-3951 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-11347.
When was CVE-2026-3951 published?: CVE-2026-3951 was published on 2026-03-11 and last updated on 2026-06-17.

References

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