High 7.3Published Sep 28, 2026

CVE-2026-101005October CMS SSRF Protection ResizeImages.php validateExternalImageHost server-side request forgery

Updated under an hour ago (2026-10-19 08:40 UTC)

Does this affect you?

It affects n/a October CMS. Add what you run to find out whether that includes you.

EPSS puts the chance of exploitation in the next 30 days at 0.30%, higher than 21% of scored CVEs.

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Every CVE for n/a October CMS

Exploited in the last 30 days

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.

CVSS: 7.3 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P/RL:O/RC:C
Weakness (CWE): CWE-918
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): 0.30% (percentile 21)
Assigned by: VulDB
NVD analysis: Deferred
Record last updated: Sep 28, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

n/a October CMS october_cms:october_cms	4.3.0; 4.3.1; 4.3.2; 4.3.3; 4.3.4; 4.3.5 not affected	CNA record

References

https://vuldb.com/vuln/410875vdb-entry, technical-description
https://vuldb.com/vuln/410875/ctisignature, permissions-required
https://vuldb.com/cve/CVE-2026-101005third-party-advisory
https://vuldb.com/submit/922294third-party-advisory
https://github.com/octobercms/october/security/advisories/GHSA-j2j7-7m99-6226related
https://github.com/0xGenesi/CVE/blob/main/October_CMS_SSRF_IPv6_Mapped_IPv4_Bypass.mdexploit
https://github.com/octobercms/october/releases/tag/v4.3.5patch
https://www.cybersecurity-help.cz/vdb/vulns/149488/related

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.