# CVE-2026-55897: OpenWrt luci-app-advanced-reboot privilege escalation via rpcd ACL

Source: https://junglewise.ai/threats/cve-2026-55897-luci-app-advanced-reboot-is-a-luci-web-interface-application-for  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-21. Updated: 2026-09-26  
License: CC BY 4.0 with a link back

CVE-2026-55897 · Severity: high · CVSS 8.8 · Published 2026-09-21

luci-app-advanced-reboot is a web-based management interface for OpenWrt routers that allows administrators to reboot firmware partitions. In versions before 1.1.2-6, a flaw in its access control configuration allowed authenticated read-only users to execute arbitrary shell commands as the root user, potentially giving attackers full control of the router network and any data passing through it.

Vendors: [OpenWrt](https://junglewise.ai/threats/vendors/openwrt).

## Quick answers

**Is CVE-2026-55897 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-55897 being exploited in the wild.

**How severe is CVE-2026-55897?** High severity, with a CVSS score of 8.8, published 21 September 2026.

**Which products and versions are affected?** OpenWrt Luci-App-Advanced-Reboot prior to 1.1.2-6.

**Is there a fix for CVE-2026-55897?** A patch was published on 2026-06-15: Version 1.1.2-6 released with security fix Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-55897 attacked?** It is attacked over the network.

**Am I affected by CVE-2026-55897?** Check whether you run OpenWrt Luci-App-Advanced-Reboot at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

The vulnerability exists in the rpcd ACL configuration file that grants file.exec permission on /bin/sh to read-level access. An authenticated delegated session with read-only access can supply caller-controlled parameters; rpcd authorizes the path and passes those arguments to the shell, enabling arbitrary command execution as root. The fix in 1.1.2-6 removes the broad file-exec grants, moves privileged actions into a dedicated write block, and handles device info gathering server-side.

## Affected products

- OpenWrt luci-app-advanced-reboot prior to 1.1.2-6

## Timeline

- 2026-06-15: patched: Version 1.1.2-6 released with security fix
- 2026-09-21: disclosed

## References

- [https://github.com/openwrt/luci/commit/2df00deb122093cbf429266ffef7ad06aaecb48f](https://github.com/openwrt/luci/commit/2df00deb122093cbf429266ffef7ad06aaecb48f)
- [https://github.com/openwrt/luci/commit/f85102548ee8325bfd581a0327b210b5f7670829](https://github.com/openwrt/luci/commit/f85102548ee8325bfd581a0327b210b5f7670829)