Vulnerability · Published Sep 21, 2026 · Assigned by GitHub_M
CVE-2026-55897luci-app-advanced-reboot read ACL exposes /bin/sh through file.exec, allowing delegated users to run commands as root
High 8.8
In plain English
A high-severity OS command injection in luci from openwrt. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.7% (higher than 51% of all known vulnerabilities).
Official 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.
Affected products (as reported)
Weakness: CWE-78 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
References
- https://github.com/openwrt/luci/security/advisories/GHSA-vj96-f37g-37f6 x_refsource_CONFIRM
- https://github.com/openwrt/luci/pull/8710 x_refsource_MISC
- https://github.com/openwrt/luci/commit/2df00deb122093cbf429266ffef7ad06aaecb48f x_refsource_MISC
- https://github.com/openwrt/luci/commit/f85102548ee8325bfd581a0327b210b5f7670829 x_refsource_MISC