CVE-2026-55897

8.8 HIGHpublic exploit available

Published 2026-09-21 · Updated 2026-09-24

AI risk analysis

Summary: The flaw allows an authenticated user with specific permissions to execute arbitrary commands as root via the luci-app-advanced-reboot web interface, posing a significant security risk.
Exploitability: Exploitation requires an authenticated session with read ACL on the rpcd file, making it moderately difficult. Precondition is the presence of the affected version of luci-app-advanced-reboot.
Blast radius: If exploited, this vulnerability could lead to complete compromise of the router, including loss of control and potential data exfiltration.
Detection: No reliable host or network indicator is derivable from the published description.
Prioritized remediation: Upgrade to luci-app-advanced-reboot version 1.1.2-6 or later.

rcewebauth-bypassrootarbitrary-command

Analysis generated locally by qwen2.5:7b-instruct (no data left the box). AI-assisted — verify against primary sources before acting.

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 vector

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

Weaknesses

CWE-78

Public exploit & PoC references

All references

Source data: NVD (nvd.nist.gov), public domain. Exploit-DB.ai adds local AI analysis for defensive use only.

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