CVE-2026-11976
MonsterInsights Pro update bucket compromised; malicious plugin update installs backdoor on WordPress sites.
Is CVE-2026-11976 being exploited?
Not confirmed. CVE-2026-11976 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 0.49% probability of exploitation in the next 30 days.
How severe is CVE-2026-11976?
CVE-2026-11976 is rated Critical with a CVSS score of 10.0. 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-2026-11976?
Not known from our data. No patch reference has been recorded for CVE-2026-11976, which is not the same as no patch existing — a fix may have shipped without a tagged reference, or after this record was written. The vendor advisory is the only authority on whether a fix exists, and mitigations may be available regardless.
What does CVE-2026-11976 affect?
CVE-2026-11976 affects MonsterInsights Pro (WordPress) 10.2.0, MonsterInsights Pro (WordPress) 10.2.2, WordPress sites using MonsterInsights Pro, monster-insights.s3.amazonaws.com (update distribution bucket). Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-11976?
Isolate S3 bucket, remove malicious files, restore clean backups, rotate keys/credentials, scan and patch when vendor fixes.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Malicious update (class-system-check.php) provides PHP backdoor enabling remote code execution, persistence, data theft, and full site takeover.
Immediate action required
- affected>= 10.2.0 and < 11.0.0
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.