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CVE-2026-70552 – Authentication Bypass – MaxSite CMS 0.78 through 109.5

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Summary

CVE-2026-70552 is an authentication bypass (Missing Authentication for Critical Function, CWE-306) in the AJAX dispatcher of MaxSite CMS. Unauthenticated, network-based attackers can reach admin-gated endpoints, allowing privileged operations without credentials. The flaw affects MaxSite CMS 0.78 through 109.5 and is rated critical (CVSS v3.1 9.8 / CVSS v4.0 9.3).

Technical details

  • Root cause: The AJAX dispatcher fails to enforce authentication before routing requests to admin-restricted handlers.
  • Trigger conditions: An attacker supplies any X-Requested-With header and requests a base64-encoded path that resolves to any *-ajax.php file in the codebase.
  • Attack vector: Network; no privileges and no user interaction required, with low attack complexity.
  • Impact: Unauthenticated access to admin-gated endpoints, enabling privileged operations across plugin AJAX endpoints and manipulation of application state.

Affected software

  • MaxSite CMS versions 0.78 through 109.5 (inclusive).
  • Fixed in MaxSite CMS 109.6.

Severity

  • CVSS v3.1 base score: 9.8 (Critical) — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
  • CVSS v4.0 base score: 9.3 (Critical) — CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Mitigation and recommended actions

  • Immediate: Upgrade to MaxSite CMS 109.6 or later, which remediates the vulnerability.
  • If no patch can be applied: Restrict network access to the CMS and its administrative and AJAX endpoints, and filter requests to *-ajax.php paths at a reverse proxy or WAF until the upgrade is completed.

How IONIX identifies potentially affected assets

IONIX matches the following signals against data already collected when it crawled the asset; identifying the technology sends no request beyond that crawl.

  • generator meta tag content: MaxSite CMS

References

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How IONIX’s External Exposure Management Platform Detects and Validates
Zero-Days to Shrink MTTR

1

Map your entire attack surface (continously)

IONIX uses multi-factor discovery methods, including DNS analysis, certificate mapping, metadata inspection, and more, to automatically map every internet-facing asset across your environment. This includes cloud instances, third-party platforms, shadow IT, and even forgotten infrastructure that traditional tools miss.

2

Monitor for new CVEs

Dozens of threat intel feeds using agentic technology are continuously analyzed to detect the appearance of proof-of-concept code, exploit kits, and indicators of active targeting. IONIX goes further by applying AI to proactively evaluate whether emerging vulnerabilities are likely to be exploited, even before PoCs go public.

3

Identify Potential External Exposures

Not all CVEs matter. IONIX filters vulnerabilities by asking attacker-centric questions: Can it be reached from the internet? Does it require authentication? Is it being exploited in the wild? This dramatically reduces noise and focuses teams on threats that can actually be weaponized.

4

Create Safe, Scalable Exploit Validations

IONIX transforms real-world PoCs into safe, non-intrusive test payloads that can be run in production environments without disruption. These simulations are precisely targeted to the systems that are vulnerable, ensuring rapid validation without unnecessary load.

5

Execute Exploit Validations

By combining context about software stack, versioning, exposure status, and reachability, IONIX ensures that only the right payloads are executed against the right assets, maximizing efficiency and minimizing risk.

6

Drive Fast and Actionable Remediation

Results are routed through integrations with ticketing, SOAR, and SIEM tools. Issues are written in plain language, bundled into remediation clusters, and prioritized based on asset criticality, exploitability, and blast radius. This shortens mean time to remediation (MTTR) and empowers teams to act with confidence.

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  • Mapping of all Assets with this Technology
  • Identification of potentially exposed assets to this CVE
  • Confirmation of verified exploitable assets
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