Is CVE-2026-37552 actively exploited?

No active exploitation of CVE-2026-37552 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-37552 be exploited remotely?

No. CVE-2026-37552 requires local access to exploit.

What is the CVSS score of CVE-2026-37552?

CVE-2026-37552 has a CVSS score of 8.4 (HIGH).

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HIGH

CVE-2026-37552

CWE-502Published: May 1, 2026· Updated: May 7, 2026

8.4

CVSS v3.1

EPSS:0.10%probability of exploitation in 30 daysPercentile:27.8th

Official Description

Unsafe deserialization vulnerability in MixPHP Framework 2.x thru 2.2.17. The sync-invoke TCP server (Server.php:87) receives data from a TCP socket, passes it directly to Opis\Closure\unserialize(), then executes the result via call_user_func(). No authentication or signature verification exists on the TCP connection. An attacker with access to the localhost TCP port (server binds 127.0.0.1) can send a crafted serialized PHP closure to achieve arbitrary code execution.

NVD Source

Technical Analysis

CVE-2026-37552 requires local access, meaning attackers must already have a foothold on the target system.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

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 8.4.

From a weakness classification perspective (CWE-502): Insecure deserialization vulnerabilities allow attackers to inject malicious objects during deserialization, potentially enabling remote code execution.