EUVD-2026-75601
GHSA-3xv5-w7r3-9wj8
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/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
Requires database write access (PR:H); once obtained, exploitation is low-complexity (AC:L) with full CIA impact and no scope change (S:U).
Primary rating from Vendor (VulnCheck).
CVSS VectorVendor: VulnCheck
Lifecycle Timeline
3DescriptionCVE.org
FileRun before 2026.3.0 contains a PHP object injection vulnerability that allows authenticated attackers to execute arbitrary code by exploiting incorrect options passed to unserialize() in the Perms::getPerms() method, where a positional array is used instead of the required named-key array to disable class instantiation. Attackers with database write access can inject a serialized gadget chain into the permissions table columns processed on every authenticated page load to write arbitrary files, such as PHP webshells, to web-accessible paths.
AnalysisAI
PHP object injection in FileRun before 2026.3.0 enables authenticated attackers with database write access to achieve remote code execution via a misconfigured unserialize() call in Perms::getPerms(). A positional array is passed instead of a named-key array to set allowed_classes, causing PHP to ignore the class instantiation restriction entirely; a serialized gadget chain injected into the permissions table is deserialized on every subsequent authenticated page load, allowing arbitrary file writes - including PHP webshells - to web-accessible paths. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires database write access to the FileRun MySQL/MariaDB database - specifically the ability to modify permissions table columns consumed by Perms::getPerms(). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H) assigns a score of 8.6, which is appropriate given the high-privilege prerequisite. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Vendor-released patch: FileRun 2026.3.0. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Inventory all FileRun deployments and versions, noting that publicly available exploit code exists for this vulnerability; review database access logs for suspicious modifications to permission tables. …
Sign in for detailed remediation steps and compensating controls.
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External POC / Exploit Code
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