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Vulnerability record · CVE-2026-55897 · published 21 September 2026

CVE-2026-55897: OS command injection vulnerability

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.

8.8 CVSS 3.1 High EPSS 0.65% · top 50.9% CWE-78 · OS command injection Deferred
8.8CVSS 3.1 base score
0.65%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
5References
24 Sep 2026Last modified by NVD

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:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

References

LinkTags
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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Source: NIST National Vulnerability Database (record CVE-2026-55897), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.