How severe is CVE-2018-1000059?

CVE-2018-1000059 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-2018-1000059 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (74th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2018-1000059?

CVE-2018-1000059 affects Validformbuilder Validform Builder. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2018-1000059?

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-2018-1000059 published?

CVE-2018-1000059 was published on 2018-02-09 and last updated on 2026-06-17.

CVE-2018-1000059

CVE-2018-1000059 is a critical-severity vulnerability in Validformbuilder Validform Builder 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-502.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 2% (74th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-502
Affected product: Validformbuilder Validform Builder
Published: 2018-02-09
Last modified: 2026-06-17

Description

ValidFormBuilder version 4.5.4 contains a PHP Object Injection vulnerability in Valid Form unserialize method that can result in Possible to execute unauthorised system commands remotely and disclose file contents in file system.

Frequently asked questions

What is CVE-2018-1000059?: ValidFormBuilder version 4.5.4 contains a PHP Object Injection vulnerability in Valid Form unserialize method that can result in Possible to execute unauthorised system commands remotely and disclose file contents in file system.
How severe is CVE-2018-1000059?: CVE-2018-1000059 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-2018-1000059 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (74th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2018-1000059?: CVE-2018-1000059 affects Validformbuilder Validform Builder. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2018-1000059?: 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-2018-1000059 published?: CVE-2018-1000059 was published on 2018-02-09 and last updated on 2026-06-17.

References

https://github.com/validformbuilder/validformbuilder/issues/126

Affected products (1)

cpe:2.3:a:validformbuilder:validform_builder:4.5.4:*:*:*:*:*:*:*

Other CWE-502 (Deserialization of Untrusted Data) vulnerabilities

CVE-2026-41104 — Critical (CVSS 10.0): Deserialization of untrusted data in Microsoft Planetary Computer Pro allows an unauthorized attacker to disclose…
CVE-2026-43633 — Critical (CVSS 10.0): HestiaCP versions 1.9.0 through 1.9.4 contain a deserialization vulnerability in the web terminal component caused by a…
CVE-2026-33819 — Critical (CVSS 10.0): Deserialization of untrusted data in Microsoft Bing allows an unauthorized attacker to execute code over a network.
CVE-2026-20131 — Critical (CVSS 10.0): A vulnerability in the web-based management interface of Cisco Secure Firewall Management Center (FMC) Software could…
CVE-2026-25632 — Critical (CVSS 10.0): EPyT-Flow is a Python package designed for the easy generation of hydraulic and water quality scenario data of water…
CVE-2025-14931 — Critical (CVSS 10.0): Hugging Face smolagents Remote Python Executor Deserialization of Untrusted Data Remote Code Execution Vulnerability.…

Browse all CWE-502 (Deserialization of Untrusted Data) vulnerabilities →