What’s Vulnerable › Vulnerabilities

CVE-2026-55897: luci-app-advanced-reboot read ACL exposes /bin/sh through file.exec, allowing delegated users to run commands as root

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-21 · updated 2026-09-24
• Weakness: CWE-78

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

• openwrt luci: before 1.1.2-6

References

• https://github.com/openwrt/luci/commit/2df00deb122093cbf429266ffef7ad06aaecb48f
• https://github.com/openwrt/luci/commit/f85102548ee8325bfd581a0327b210b5f7670829
• https://github.com/openwrt/luci/pull/8710
• https://github.com/openwrt/luci/security/advisories/GHSA-vj96-f37g-37f6
• https://github.com/openwrt/luci/security/advisories/GHSA-vj96-f37g-37f6

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