Is CVE-2026-5999 actively exploited?

A proof-of-concept exploit is publicly available for CVE-2026-5999, but active exploitation has not been confirmed.

Can CVE-2026-5999 be exploited remotely?

Yes. CVE-2026-5999 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-5999?

CVE-2026-5999 has a CVSS score of 6.3 (MEDIUM).

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MEDIUMPOC

CVE-2026-5999

CWE-266Published: April 10, 2026· Updated: Apr 13, 2026

6.3

CVSS v3.1

EPSS:0.04%probability of exploitation in 30 daysPercentile:13.1th

Official Description

A vulnerability has been found in JeecgBoot up to 3.9.1. This impacts an unknown function of the component SysAnnouncementController. Such manipulation leads to improper authorization. The attack can be launched remotely. The exploit has been disclosed to the public and may be used. The vendor confirmed the issue and will provide a fix in the upcoming release.

NVD Source

Technical Analysis

CVE-2026-5999 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

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

A proof-of-concept (PoC) exploit exists for CVE-2026-5999. While not yet confirmed in active campaigns, the availability of PoC code increases exploitation risk substantially.