{"id":"CVE-2026-55897","summary":"luci-app-advanced-reboot read ACL exposes /bin/sh through file.exec, allowing delegated users to run commands as root","details":"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.","aliases":["GHSA-vj96-f37g-37f6"],"modified":"2026-09-26T03:30:41.909982822Z","published":"2026-09-21T19:29:37.003Z","database_specific":{"unresolved_ranges":[{"extracted_events":[{"fixed":"1.1.2-6"}],"source":"AFFECTED_FIELD"}],"cna_assigner":"GitHub_M","cwe_ids":["CWE-78"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55897.json"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55897.json"},{"type":"ADVISORY","url":"https://github.com/openwrt/luci/security/advisories/GHSA-vj96-f37g-37f6"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-55897"},{"type":"FIX","url":"https://github.com/openwrt/luci/commit/2df00deb122093cbf429266ffef7ad06aaecb48f"},{"type":"FIX","url":"https://github.com/openwrt/luci/commit/f85102548ee8325bfd581a0327b210b5f7670829"},{"type":"FIX","url":"https://github.com/openwrt/luci/pull/8710"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/openwrt/luci","events":[{"introduced":"0"},{"fixed":"2df00deb122093cbf429266ffef7ad06aaecb48f"},{"fixed":"f85102548ee8325bfd581a0327b210b5f7670829"}],"database_specific":{"source":"REFERENCES"}}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-55897.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"}]}