How severe is CVE-2016-5726?

CVE-2016-5726 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2016-5726 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (72nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2016-5726?

CVE-2016-5726 affects Simplemachines Simple Machines Forum. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2016-5726?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2016-5726 published?

CVE-2016-5726 was published on 2017-02-09 and last updated on 2026-06-17.

CVE-2016-5726

CVE-2016-5726 is a critical-severity vulnerability in Simplemachines Simple Machines Forum with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-94.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 2% (72nd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-94
Affected product: Simplemachines Simple Machines Forum
Published: 2017-02-09
Last modified: 2026-06-17

Description

Packages.php in Simple Machines Forum (SMF) 2.1 allows remote attackers to conduct PHP object injection attacks and execute arbitrary PHP code via the themechanges array parameter.

Frequently asked questions

What is CVE-2016-5726?: Packages.php in Simple Machines Forum (SMF) 2.1 allows remote attackers to conduct PHP object injection attacks and execute arbitrary PHP code via the themechanges array parameter.
How severe is CVE-2016-5726?: CVE-2016-5726 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2016-5726 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (72nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2016-5726?: CVE-2016-5726 affects Simplemachines Simple Machines Forum. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2016-5726?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2016-5726 published?: CVE-2016-5726 was published on 2017-02-09 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:simplemachines:simple_machines_forum:2.1:*:*:*:*:*:*:*

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