CVE-2026-101005 October CMS SSRF Protection ResizeImages.php validateExternalImageHost server-side request forgery
Attackers can perform server-side request forgery in October CMS via the image resizing component, potentially accessing internal resources.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-101005?
CVE-2026-101005 is a medium-severity server-side request forgery vulnerability in October CMS, published on 28 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-918
Which versions are affected by CVE-2026-101005?
How do I fix CVE-2026-101005?
No fix has been published for CVE-2026-101005 yet. Limit exposure of the affected software until one is available.
Upgrade, and send outbound requests through an allow-list that blocks internal addresses. More about Server-side request forgery.
Is CVE-2026-101005 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-101005 exists.
Sources
Also known as GHSA-43c9-ch4w-3vh5, GHSA-j2j7-7m99-6226.