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CVE-2026-101005

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

HIGH
7.3
CVSS Score
Published: September 28, 2026 at 06:00 AM UTC
Updated: September 28, 2026 at 03:16 PM UTC
1 product affected across 1 vendorOctober

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Severity
HIGH7.3
Exploit prediction
EPSS 0.3%
SSVC
PoC

Description

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

October· Octobercmscomposer
60%
4.3.04.3.14.3.24.3.34.3.4
Vendor states this is fixed in 4.3.5 (unaffected)

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (8)

VDB EntryTechnical Description
Source: cverecord
https://vuldb.com/vuln/410875
SignaturePermissions Required
Source: cverecord
https://vuldb.com/vuln/410875/cti
Third Party Advisory
Source: cverecord
https://vuldb.com/cve/CVE-2026-101005
Third Party Advisory
Source: cverecord
https://vuldb.com/submit/922294
Related
Source: cverecord
https://github.com/octobercms/october/security/advisories/GHSA-j2j7-7m99-6226
Exploit
Source: cverecord
https://github.com/0xGenesi/CVE/blob/main/October_CMS_SSRF_IPv6_Mapped_IPv4_Bypass.md
Patch
Source: cverecord
https://github.com/octobercms/october/releases/tag/v4.3.5
Related
Source: cverecord
https://www.cybersecurity-help.cz/vdb/vulns/149488/

SSVC — Action Prioritization

SSVCPoCAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.3HIGHVulDB
Vector?

Quick Info

StatusDEFERRED
CWE
CWE-918

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