PatchSiren cyber security CVE debrief
CVE-2026-59260 openwrt CVE debrief
The OpenWrt luci-app-samba4 vulnerability allows authenticated delegated users to execute the Samba daemon with caller-controlled command-line arguments due to a read ACL granting file.exec permission on /usr/sbin/smbd. This enables attackers to pass arbitrary Samba global options, such as message command, to a root smbd process, potentially triggering command execution when SMB protocol messages are processed. The vulnerability has a high CVSS score of 8.7, indicating high severity. Users of OpenWrt luci-app-samba4 should verify their systems for exposure and apply patches or mitigations as available. The CVE record was published on 2026-07-12T12:16:45.977Z and has not been modified since then.
- Vendor
- openwrt
- Product
- luci
- CVSS
- HIGH 8.7
- CISA KEV
- Not listed in stored evidence
- Original CVE published
- 2026-07-12
- Original CVE updated
- 2026-07-12
- Advisory published
- 2026-07-12
- Advisory updated
- 2026-07-12
Who should care
Users of OpenWrt luci-app-samba4, OpenWrt administrators, security teams, and vulnerability management teams should verify their systems for exposure and apply patches or mitigations as available. Additionally, operators of affected systems, platform administrators, and security personnel responsible for vulnerability management and incident response should be aware of the potential impact and take necessary actions.
Technical summary
The 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. This vulnerability has a high CVSS score of 8.7, indicating high severity. Affected systems should be identified and patched or mitigated as soon as possible.
Defensive priority
High priority due to high CVSS score of 8.7 and potential for command execution.
Recommended defensive actions
- Verify and apply OpenWrt luci-app-samba4 patches or updates
- Restrict access to /usr/sbin/smbd and Samba configuration
- Monitor Samba logs for suspicious activity
- Limit delegated user permissions
- Implement compensating controls for Samba services
- Review OpenWrt luci-app-samba4 configurations for exposure
- Track exceptions and retest remediated assets
Evidence notes
Evidence from official CVE and NVD sources indicate a high severity vulnerability in OpenWrt luci-app-samba4. Limited details are available on affected versions or specific exploitation. Defenders should verify OpenWrt luci-app-samba4 configurations, review Samba global options, and monitor for suspicious activity. The CVE record was published on 2026-07-12T12:16:45.977Z and has not been modified since then. Additional review of vendor advisories and source references is recommended.
Official resources
AI-assisted PatchSiren debrief based on the supplied source corpus. The CVE record was published on 2026-07-12T12:16:45.977Z and has not been modified since then.