CVE-2026-70552
Unauthenticated AJAX dispatcher bypass in MaxSite CMS allows admin endpoint access.
Is CVE-2026-70552 being exploited?
Not confirmed. CVE-2026-70552 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 0.57% probability of exploitation in the next 30 days.
How severe is CVE-2026-70552?
CVE-2026-70552 is rated Critical with a CVSS score of 9.3. 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-2026-70552?
Not known from our data. No patch reference has been recorded for CVE-2026-70552, 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-2026-70552 affect?
CVE-2026-70552 affects MaxSite CMS <= 109.5, MaxSite plugins with admin *-ajax.php endpoints. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-70552?
Apply vendor patch when available; meanwhile restrict dispatcher access, block base64 *-ajax.php requests, deploy WAF rules.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Unauthenticated attackers can reach admin-only AJAX endpoints, manipulate polls/votes and execute privileged plugin actions, enabling site compromise or data manipulation.
Immediate action required
- affected>= 0.78 and <= 109.5
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.