CVE-2026-3991

Local privilege escalation through undisclosed Endpoint Agent flaw

Published Mar 30, 2026 · Updated Mar 30, 2026

Privilege escalation in affected Symantec Data Loss Prevention Windows Endpoint 16.0, 16.1, and 25.1 releases allows local users to gain elevated access. Broadcom has not published the affected Endpoint Agent component or the operation that mishandles attacker-controlled input. Exploitation requires existing low-privilege access to a Windows endpoint and grants access to resources normally protected from that user.

CVSS severity7.8
High
EPSS probability0.20%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Privilege escalation in affected Symantec Data Loss Prevention Windows Endpoint 16.0, 16.1, and 25.1 releases allows local users to gain elevated access. Broadcom has not published the affected Endpoint Agent component or the operation that mishandles attacker-controlled input. Exploitation requires existing low-privilege access to a Windows endpoint and grants access to resources normally protected from that user.

The record

CVE
CVE-2026-3991
Published
Mar 30, 2026
Updated
Mar 30, 2026
Vendor
Brocade Communications Systems
Product
Symantec Data Loss Prevention
Classifications
CWE-829, CAPEC-233, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 30, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 30, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Affected versions are unavailable in this record. Check the vendor advisory for version and patch details.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Brocade Communications Systems · Symantec Data Loss PreventionAffected versions are unavailable in this record.

Published CVSS scores

7.8Symantec CorporationCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-829Inclusion of Functionality from Untrusted Control Sphere
CAPEC-233Privilege Escalation
T1068Exploitation for Privilege Escalation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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