SSRF in October Cms
CVE-2026-101005
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.
Vulnerability class: SSRF (Server-Side Request Forgery)
Published .
CVSS v3 metric
CVSS v3 base score 7.3 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
- October Cms — versions 4.3.0, 4.3.1, 4.3.2
Weakness classification (CWE)
References
- vuldb.com/vuln/410875 (technical-description, vdb-entry)
- vuldb.com/vuln/410875/cti (signature, permissions-required)
- vuldb.com/cve/CVE-2026-101005 (third-party-advisory)
- vuldb.com/submit/922294 (third-party-advisory)
- github.com/octobercms/october/security/advisories/GHSA-j2j7-7m99-6226 (related)
- github.com/0xGenesi/CVE/blob/main/October_CMS_SSRF_IPv6_Mapped_IPv4_Bypass.md (exploit)
- github.com/octobercms/october/releases/tag/v4.3.5 (patch)
- www.cybersecurity-help.cz/vdb/vulns/149488/ (related)
Frequently asked questions
- What is CVE-2026-101005?
- CVE-2026-101005 is a high-severity vulnerability in October Cms, classified under Server-Side Request Forgery (SSRF). CVSS score: 7.3/10. Published 2026-09-28.
- How severe is CVE-2026-101005?
- High severity. CVSS v3 base score is 7.3 out of 10.