Is CVE-2026-3991 actively exploited?

No active exploitation of CVE-2026-3991 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-3991 be exploited remotely?

No. CVE-2026-3991 requires local access to exploit.

What is the CVSS score of CVE-2026-3991?

CVE-2026-3991 has a CVSS score of 7.8 (HIGH).

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HIGH

CVE-2026-3991

CWE-829Published: March 30, 2026· Updated: Apr 1, 2026

7.8

CVSS v3.1

EPSS:0.01%probability of exploitation in 30 daysPercentile:2.0th

Official Description

Symantec Data Loss Prevention Windows Endpoint, prior to 25.1 MP1, 16.1 MP2, 16.0 RU2 HF9, 16.0 RU1 MP1 HF12, and 16.0 MP2 HF15, may be susceptible to a Elevation of Privilege vulnerability, which is a type of issue whereby an attacker may attempt to compromise the software application to gain elevated access to resources that are normally protected from an application or user.

NVD Source

Technical Analysis

CVE-2026-3991 requires local access, meaning attackers must already have a foothold on the target system.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 7.8.