Is CVE-2026-5537 actively exploited?

No active exploitation of CVE-2026-5537 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-5537 be exploited remotely?

Yes. CVE-2026-5537 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-5537?

CVE-2026-5537 has a CVSS score of 6.3 (MEDIUM).

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MEDIUM

CVE-2026-5537

CWE-74Published: April 5, 2026· Updated: Apr 7, 2026

6.3

CVSS v3.1

EPSS:0.03%probability of exploitation in 30 daysPercentile:7.2th

Official Description

A security vulnerability has been detected in halex CourseSEL up to 1.1.0. Affected by this vulnerability is the function check_sel of the file Apps/Index/Controller/IndexController.class.php of the component HTTP GET Parameter Handler. The manipulation of the argument seid leads to sql injection. It is possible to initiate the attack remotely. The exploit has been disclosed publicly and may be used. The vendor was contacted early about this disclosure but did not respond in any way.

NVD Source

Technical Analysis

CVE-2026-5537 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.