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CVE-2026-55159

luci-app-adblock-fast: Delegated `luci-app-adblock-fast` users can reach root command execution by injecting newline-separated cron entries

HIGH
8.8
CVSS Score
Published: September 21, 2026 at 07:24 PM UTC
Updated: September 29, 2026 at 02:17 PM UTC
1 product affected across 1 vendorLuci App Adblock Fast

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Severity
HIGH8.8
Exploit prediction
EPSS 0.7%
SSVC
PoC

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Luci App Adblock Fast· Openwrt
60%
v < 1.2.4-2
Affected range stops below 1.2.4-2, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (4)

x_refsource_CONFIRM
Source: cverecord
https://github.com/openwrt/luci/security/advisories/GHSA-ggpf-xrph-wg5v
x_refsource_MISC
Source: cverecord
https://github.com/openwrt/luci/pull/8705
x_refsource_MISC
Source: cverecord
https://github.com/openwrt/luci/commit/9ccd99b5898457e5ef39dc21aea226d7fb6e5c7e
x_refsource_MISC
Source: cverecord
https://github.com/openwrt/luci/commit/f67461fd0255bf992b2b559c22ec288067f2f9da

SSVC — Action Prioritization

SSVCPoCNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

8.8HIGHGitHub_M
Attack Vector
NETWORK
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusDEFERRED
CWE
CWE-93

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