CVE-2026-16618
Unauthenticated file-upload RCE in Improve SEO WordPress plugin (<=2.0.11).
Is CVE-2026-16618 being exploited?
Not confirmed. CVE-2026-16618 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 0.46% probability of exploitation in the next 30 days.
How severe is CVE-2026-16618?
CVE-2026-16618 is rated Critical with a CVSS score of 9.8. 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-2026-16618?
Not known from our data. No patch reference has been recorded for CVE-2026-16618, 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-2026-16618 affect?
CVE-2026-16618 affects Improve SEO WordPress plugin <=2.0.11, Self-hosted WordPress sites, PHP-enabled web servers. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-16618?
Disable/remove plugin immediately; apply vendor patch when released; scan for compromise.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Unauthenticated attackers can upload PHP to a public dir and achieve remote code execution and full site compromise.
Immediate action required
- affected<= 2.0.11
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.