EUVD-2026-14956Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Primary rating from NVD.
CVSS VectorNVD
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Lifecycle Timeline
4DescriptionCVE.org
An unauthenticated attacker can exploit the Frontend 'validate' action to blindly instantiate arbitrary PHP classes. The impact depends on environment setup but appears limited at this time.
AnalysisAI
An unauthenticated remote code execution vulnerability exists in Zabbix's Frontend 'validate' action that permits blind instantiation of arbitrary PHP classes without authentication. The vulnerability affects Zabbix products across multiple versions as indicated by the CPE wildcard notation, and while the immediate impact appears limited by environment-specific constraints, successful exploitation could lead to information disclosure or arbitrary code execution depending on available PHP classes in the deployment context. No CVSS score, EPSS data, or KEV status is currently published, but the attack vector is unauthenticated and likely has low complexity, suggesting meaningful real-world risk.
Technical ContextAI
The vulnerability stems from CWE-470 (Use of Externally-Controlled Input to Select Classes or Code), a deserialization-adjacent flaw where untrusted input directly influences object instantiation. The Zabbix Frontend 'validate' action fails to properly restrict which PHP classes can be instantiated, allowing an attacker to trigger the loading of arbitrary classes through manipulated requests. This is particularly dangerous in PHP environments where PHP Object Injection or gadget chains exist within loaded libraries. The affected component is the Zabbix web interface itself (cpe:2.3:a:zabbix:zabbix), which is universally deployed as the administrative frontend for monitoring infrastructure. The root cause is insufficient input validation combined with dynamic class instantiation without whitelisting.
RemediationAI
Upgrade Zabbix to the patched version released in conjunction with the ZBX-27641 advisory (visit https://support.zabbix.com/browse/ZBX-27641 for specific version numbers and release dates). As an interim mitigation, restrict network access to the Zabbix Frontend to trusted administrative IP ranges using firewall rules or reverse proxy (nginx/Apache with IP whitelisting), enforce HTTPS-only connections to prevent credential interception and add a layer of transport security, and monitor for suspicious requests to the 'validate' action endpoint (e.g., requests with unusual class instantiation patterns in parameters). Disable or restrict the 'validate' action if possible during the patching window.
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Same technique Information Disclosure
View allVendor StatusVendor
SUSE
Severity: Medium| Product | Status |
|---|---|
| SUSE Linux Enterprise Server 12 SP5 | Fixed |
| SUSE Linux Enterprise Server 12 SP5-LTSS | Fixed |
| SUSE Linux Enterprise Server 12 SP5-LTSS Extended Security | Fixed |
| SUSE Linux Enterprise Server LTSS Extended Security 12 SP5 | Fixed |
| SUSE Linux Enterprise Server 12 SP3-BCL | Fixed |
| SUSE Linux Enterprise Server 12 SP3-ESPOS | Fixed |
| SUSE Linux Enterprise Server 12 SP3-LTSS | Fixed |
| SUSE Linux Enterprise Server 12 SP4 | Fixed |
| SUSE Linux Enterprise Server 12 SP4-ESPOS | Fixed |
| SUSE Linux Enterprise Server 12 SP4-LTSS | Fixed |
| SUSE Linux Enterprise Server for SAP Applications 12 SP3 | Fixed |
| SUSE Linux Enterprise Server for SAP Applications 12 SP4 | Fixed |
| SUSE OpenStack Cloud 8 | Fixed |
| SUSE OpenStack Cloud 9 | Fixed |
| SUSE OpenStack Cloud Crowbar 8 | Fixed |
| SUSE OpenStack Cloud Crowbar 9 | Fixed |
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