CVE-2026-72840
Authenticated LuCI users can append root cron entries, enabling root code execution.
Is CVE-2026-72840 being exploited?
Not confirmed. CVE-2026-72840 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.38% probability of exploitation in the next 30 days.
How severe is CVE-2026-72840?
CVE-2026-72840 is rated High with a CVSS score of 8.7. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-72840?
Yes. A fix has been recorded for CVE-2026-72840. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-72840 affect?
CVE-2026-72840 affects OpenWrt LuCI (luci-mod-system-mounts), Devices running OpenWrt with LuCI and default busybox crond. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-72840?
Restrict/remove mount-config ACL, block remote LuCI access, apply OpenWrt patch when released.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Authenticated user with mount-config ACL can append to /etc/crontabs/root, allowing root command execution via busybox crond.
Immediate action required