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luci-app-samba4 EUVDEUVD-2026-43233

| CVE-2026-59260 HIGH
Improper Privilege Management (CWE-269)
2026-07-12 VulnCheck GHSA-7pqv-wj3v-fcq3
Privilege Escalation Luci
8.7
CVSS 4.0 · Vendor: VulnCheck
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Vendor (VulnCheck) PRIMARY
8.7 HIGH
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/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
vuln.today AI
8.8 HIGH

Network-reachable LuCI/ubus with low complexity but requires an authenticated delegated account (PR:L); execution as root yields full C/I/A impact.

3.1 AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
4.0 AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Primary rating from Vendor (VulnCheck).

CVSS VectorVendor: VulnCheck

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/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
Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
X

Lifecycle Timeline

1
Analysis Generated
Jul 12, 2026 - 12:44 vuln.today

DescriptionCVE.org

OpenWrt luci-app-samba4 read ACL grants file.exec permission on /usr/sbin/smbd, allowing authenticated delegated users to execute the Samba daemon with caller-controlled command-line arguments. Attackers can pass arbitrary Samba global options such as message command to a root smbd process, triggering command execution when SMB protocol messages are processed.

AnalysisAI

Privilege escalation to root in OpenWrt's luci-app-samba4 (LuCI web interface) lets authenticated delegated users invoke the root-owned Samba daemon with attacker-controlled arguments. The package's 'read' ACL improperly grants file.exec permission on /usr/sbin/smbd, so a low-privileged operator can launch smbd with global options like 'message command' and achieve arbitrary command execution as root when SMB messages are processed. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Authenticate as delegated read user
Delivery
Invoke smbd via file.exec ACL
Exploit
Pass malicious 'message command' global option
Execution
Root smbd processes SMB message
Impact
Arbitrary command executes as root
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Vulnerability AssessmentAI

Exploitation The attacker must possess a valid authenticated LuCI/ubus account assigned the delegated 'read' ACL role (PR:L) on a device running the vulnerable luci-app-samba4 package with the smbd file.exec grant present. … 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:L/UI:N/VC:H/VI:H/VA:H) scores 8.7 High and is internally consistent: network reachable, low complexity, but requires an authenticated delegated (low-privileged) account (PR:L), yielding full confidentiality/integrity/availability compromise. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker holding a delegated OpenWrt account with only the 'read' role authenticates to the LuCI/ubus interface over the network, then uses the improperly granted file.exec permission to launch /usr/sbin/smbd with a crafted global option such as 'message command=<attacker shell command>'. When an SMB message is processed, the root smbd executes the supplied command, giving the low-privileged user full root code execution on the router. …
Remediation Apply the fix from the OpenWrt LuCI security advisory GHSA-vx64-mmp7-h36c (https://github.com/openwrt/luci/security/advisories/GHSA-vx64-mmp7-h36c); a patch is available per that vendor advisory, but a released, tagged fixed version is not independently confirmed in the available data, so update luci-app-samba4 to the corrected package once your feed publishes it (opkg/apk update then upgrade). … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

24 HOURS: Inventory all OpenWrt deployments with luci-app-samba4; restrict LuCI administrative interface access to authorized administrators only (network whitelist/VPN requirement); disable luci-app-samba4 on systems where Samba4 is not required. …

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EUVD-2026-43233 vulnerability details – vuln.today
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