CVE-2026-21411
OpenBlocks admin auth bypass in firmware < 5.0.8.
Is CVE-2026-21411 being exploited?
Not confirmed. CVE-2026-21411 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-2026-21411?
CVE-2026-21411 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-2026-21411?
Yes. A fix has been recorded for CVE-2026-21411. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-21411 affect?
CVE-2026-21411 affects OpenBlocks series firmware < FW5.0.8. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-21411?
Upgrade to FW 5.0.8+; resecure admin accounts.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Bypasses admin login to change passwords; attacker could gain full admin control of affected devices.
Patch when possible
- affectedall versions prior to FW5.0.8
- affectedall versions prior to FW5.0.8
- affectedall versions prior to FW5.0.8
- affectedall versions prior to FW5.0.8
- affectedall versions prior to FW5.0.8
- affectedall versions prior to FW5.0.8
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.