CVE-2026-55897: CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection') in openwrt luci
luci-app-advanced-reboot is a LuCI (web interface) application for OpenWrt that provides a way to reboot your router into an alternative firmware partition or perform reboot operations directly from the web UI. Prior to 1.1.2-6, the luci-app-advanced-reboot read ACL in applications/luci-app-advanced-reboot/root/usr/share/rpcd/acl.d/luci-app-advanced-reboot.json grants rpcd file.exec permission for the general shell interpreter /bin/sh. An authenticated delegated session with that read ACL can supply caller-controlled params; rpcd authorizes the executable path and passes those arguments to the shell, allowing arbitrary commands to execute as root. Builds without the /bin/sh exec grant, including the checked openwrt-24.10 and openwrt-23.05 branches, are not affected by this specific chain. This vulnerability is fixed in 1.1.2-6.
AI Analysis
Technical Summary
The luci-app-advanced-reboot application in OpenWrt's LuCI interface prior to version 1.1.2-6 improperly grants rpcd file.exec permission for /bin/sh. An authenticated delegated session with read ACL can supply caller-controlled parameters that rpcd authorizes and passes to the shell, enabling arbitrary command execution as root. This constitutes an OS command injection vulnerability (CWE-78). Builds without the /bin/sh exec grant, such as openwrt-24.10 and openwrt-23.05 branches, are not vulnerable. The vulnerability is resolved in version 1.1.2-6.
Potential Impact
Successful exploitation allows an authenticated delegated session user to execute arbitrary commands with root privileges on the affected device. This can lead to full system compromise, including confidentiality, integrity, and availability impacts.
Mitigation Recommendations
Upgrade to luci-app-advanced-reboot version 1.1.2-6 or later, where this vulnerability is fixed. Builds that do not grant rpcd file.exec permission to /bin/sh, such as openwrt-24.10 and openwrt-23.05 branches, are not affected by this vulnerability.
CVE-2026-55897: CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection') in openwrt luci
Description
luci-app-advanced-reboot is a LuCI (web interface) application for OpenWrt that provides a way to reboot your router into an alternative firmware partition or perform reboot operations directly from the web UI. Prior to 1.1.2-6, the luci-app-advanced-reboot read ACL in applications/luci-app-advanced-reboot/root/usr/share/rpcd/acl.d/luci-app-advanced-reboot.json grants rpcd file.exec permission for the general shell interpreter /bin/sh. An authenticated delegated session with that read ACL can supply caller-controlled params; rpcd authorizes the executable path and passes those arguments to the shell, allowing arbitrary commands to execute as root. Builds without the /bin/sh exec grant, including the checked openwrt-24.10 and openwrt-23.05 branches, are not affected by this specific chain. This vulnerability is fixed in 1.1.2-6.
CVSS v3.1
Score 8.8high
Affected software
openwrt
luci
pkg:github/openwrt/luci-app-advanced-rebootRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The luci-app-advanced-reboot application in OpenWrt's LuCI interface prior to version 1.1.2-6 improperly grants rpcd file.exec permission for /bin/sh. An authenticated delegated session with read ACL can supply caller-controlled parameters that rpcd authorizes and passes to the shell, enabling arbitrary command execution as root. This constitutes an OS command injection vulnerability (CWE-78). Builds without the /bin/sh exec grant, such as openwrt-24.10 and openwrt-23.05 branches, are not vulnerable. The vulnerability is resolved in version 1.1.2-6.
Potential Impact
Successful exploitation allows an authenticated delegated session user to execute arbitrary commands with root privileges on the affected device. This can lead to full system compromise, including confidentiality, integrity, and availability impacts.
Mitigation Recommendations
Upgrade to luci-app-advanced-reboot version 1.1.2-6 or later, where this vulnerability is fixed. Builds that do not grant rpcd file.exec permission to /bin/sh, such as openwrt-24.10 and openwrt-23.05 branches, are not affected by this vulnerability.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-06-17T16:59:42.760Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6ab189c655bf5e2cf56100ef
Added to database: 09/21/2026, 19:47:18 UTC
Last enriched: 09/21/2026, 20:01:39 UTC
Last updated: 09/22/2026, 00:41:35 UTC
Views: 9
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