{"id":"CVE-2026-55159","revision":null,"records":[{"revision":"7c565f85d73d4514a9b923e8d39fa996","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-55159","aliases":[],"title":"luci-app-adblock-fast: Delegated `luci-app-adblock-fast` users can reach root command execution by injecting newline-separated cron entries","description":"luci-app-adblock-fast a WebUI for fast, lightweight DNS-based ad-blocker for OpenWrt that works with dnsmasq, smartdns, or unbound. Prior to 1.2.4-2, the luci.adblock-fast.setCronEntry RPC method accepts an entry argument containing carriage-return or line-feed characters and serializes it into /etc/crontabs/root as though it were one logical line. An authenticated delegated user with the luci-app-adblock-fast write ACL can therefore create an additional physical root cron entry through applications/luci-app-adblock-fast/root/usr/share/rpcd/ucode/luci.adblock-fast, resulting in persistent command execution as UID 0 when cron runs. The issue is not demonstrated for unauthenticated callers or users without the component write ACL. This vulnerability is fixed in 1.2.4-2.","state":0,"publishedAt":"2026-09-21T19:24:03.581+00:00","modifiedAt":"2026-09-29T14:01:11.023+00:00","affected":[{"ecosystem":"Vendor product","name":"luci-app-adblock-fast","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"openwrt\",\n                    \"product\": \"luci-app-adblock-fast\",\n                    \"versions\": [\n                        {\n                            \"version\": \"< 1.2.4-2\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":8.8,"severity":"HIGH"}],"references":["https://github.com/openwrt/luci/security/advisories/GHSA-ggpf-xrph-wg5v","https://github.com/openwrt/luci/pull/8705","https://github.com/openwrt/luci/commit/9ccd99b5898457e5ef39dc21aea226d7fb6e5c7e","https://github.com/openwrt/luci/commit/f67461fd0255bf992b2b559c22ec288067f2f9da"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-55159","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-55159","identifiers":["CVE-2026-55159"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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