CVE-2026-70553 (GCVE-0-2026-70553)

Vulnerability from cvelistv5 – Published: 2026-08-04 19:37 – Updated: 2026-08-04 20:04
VLAI
Title
MaxSite CMS Unauthenticated RCE via Install Endpoint
Summary
MaxSite CMS contains a remote code execution vulnerability that allows unauthenticated attackers to inject arbitrary PHP code into the application configuration file by submitting crafted POST requests to the install endpoint after installation is complete. Attackers can supply a malicious db_dbprefix value containing a single quote to break out of a PHP string literal in application/config/database.php, appending attacker-controlled PHP statements that are executed by the web server on every subsequent request, resulting in persistent unauthenticated remote code execution as the web-server process user.
Severity
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
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE
  • CWE-94 - Improper Control of Generation of Code ('Code Injection')
Assigner
References
Impacted products
Vendor Product Version
MaxSite MaxSite CMS Affected: 105.2 , ≤ 109.5 (custom)
Unaffected: 109.6 (custom)
Create a notification for this product.
Date Public
2026-08-04 00:00
Credits
Amir Aliu & Enrik Mustafa
Show details on NVD website
To clipboard 

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        }
      ],
      "metrics": [
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            "Recovery": "NOT_DEFINED",
            "Safety": "NOT_DEFINED",
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            "baseScore": 9.3,
            "baseSeverity": "CRITICAL",
            "exploitMaturity": "NOT_DEFINED",
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      "providerMetadata": {
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          "url": "https://max-3000.com/page/maxsite-cms-109-6"
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        }
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      "source": {
        "discovery": "UNKNOWN"
      },
      "title": "MaxSite CMS Unauthenticated RCE via Install Endpoint",
      "x_generator": {
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    }
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  "cveMetadata": {
    "assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
    "assignerShortName": "VulnCheck",
    "cveId": "CVE-2026-70553",
    "datePublished": "2026-08-04T19:37:43.200Z",
    "dateReserved": "2026-08-04T19:19:05.906Z",
    "dateUpdated": "2026-08-04T20:04:38.632Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
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  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.