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CVE-2026-101005

October CMS SSRF Protection ResizeImages.php validateExternalImageHost server-side request forgery

CVSS 4.0 6.9 MEDIUMCVSS 3.1 7.3 HIGHCVSS 3.0 7.3 HIGHCVSS 2.0 7.5 Check source for fixed versionsKEV status unknown

Original advisory

Historical advisory recorded 23 Oct 2026 15:48:27 UTC. Read the latest advisory.

cve-program · CVE-2026-101005

Published

A vulnerability was detected in October CMS up to 4.3.4. This affects the function validateExternalImageHost of the file System/Classes/ResizeImages.php of the component SSRF Protection. The manipulation results in server-side request forgery. The attack may be launched remotely. The exploit is now public and may be used. Upgrading to version 4.3.5 is able to mitigate this issue. You should upgrade the affected component.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-101005

Published

October CMS

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "n/a",
                    "product": "October CMS",
                    "versions": [
                        {
                            "version": "4.3.0",
                            "status": "affected"
                        },
                        {
                            "version": "4.3.1",
                            "status": "affected"
                        },
                        {
                            "version": "4.3.2",
                            "status": "affected"
                        },
                        {
                            "version": "4.3.3",
                            "status": "affected"
                        },
                        {
                            "version": "4.3.4",
                            "status": "affected"
                        },
                        {
                            "version": "4.3.5",
                            "status": "unaffected"
                        }
                    ],
                    "cpes": [
                        "cpe:2.3:a:october_cms:october_cms:*:*:*:*:*:*:*:*"
                    ],
                    "modules": [
                        "SSRF Protection"
                    ]
                }

Original source record · Cite this exact observation · Complete original publisher JSON