OpenWrt luci-app-advanced-reboot up to 1.1.2-5 ACL luci-app-advanced-reboot.json privileges management

Summaryinfo

A vulnerability was found in OpenWrt luci-app-advanced-reboot up to 1.1.2-5. It has been declared as very critical. Affected by this vulnerability is an unknown functionality of the file applications/luci-app-advanced-reboot/root/usr/share/rpcd/acl.d/luci-app-advanced-reboot.json of the component ACL. Executing a manipulation can lead to privileges management. This vulnerability is tracked as CVE-2026-55897. The attack can be launched remotely. No exploit exists. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability classified as very critical was found in OpenWrt luci-app-advanced-reboot up to 1.1.2-5. This vulnerability affects some unknown processing of the file applications/luci-app-advanced-reboot/root/usr/share/rpcd/acl.d/luci-app-advanced-reboot.json of the component ACL. The manipulation with an unknown input leads to a privileges management vulnerability. The CWE definition for the vulnerability is CWE-269. The product does not properly assign, modify, track, or check privileges for an actor, creating an unintended sphere of control for that actor. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is shared for download at github.com. This vulnerability was named CVE-2026-55897 since 06/17/2026. The exploitation appears to be easy. The attack can be initiated remotely. There are known technical details, but no exploit is available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 09/21/2026). The MITRE ATT&CK project declares the attack technique as T1068.

By approaching the search of inurl:applications/luci-app-advanced-reboot/root/usr/share/rpcd/acl.d/luci-app-advanced-reboot.json it is possible to find vulnerable targets with Google Hacking.

Upgrading to version 1.1.2-6 eliminates this vulnerability.

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Productinfo

Vendor

• OpenWrt

Name

• luci-app-advanced-reboot

Version

• 1.1.2-5

CPE 2.3info

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CPE 2.2info

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