Is CVE-2016-9866 actively exploited?

No active exploitation of CVE-2016-9866 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2016-9866 be exploited remotely?

Yes. CVE-2016-9866 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2016-9866?

CVE-2016-9866 has a CVSS score of 9.8 (CRITICAL).

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CRITICAL

CVE-2016-9866

CWE-352Published: December 11, 2016· Updated: Jun 17, 2026

9.8

CVSS v3.1

Official Description

An issue was discovered in phpMyAdmin. When the arg_separator is different from its default & value, the CSRF token was not properly stripped from the return URL of the preference import action. All 4.6.x versions (prior to 4.6.5), 4.4.x versions (prior to 4.4.15.9), and 4.0.x versions (prior to 4.0.10.18) are affected.

NVD Source

Technical Analysis

CVE-2016-9866 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

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 9.8.