High severity · published Sep 28, 2026
CVE-2026-101005
October CMS SSRF Protection ResizeImages.php validateExternalImageHost server-side request forgery
7.3
CVSS
0.3%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
Low
Integrity
Low
Availability
Low
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 22% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
OC
October CMS · October Cms
4.3.0; 4.3.1; 4.3.2; 4.3.3; 4.3.4 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-101005
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-101005
vdb-entry
https://vuldb.com/vuln/410875
signature
https://vuldb.com/vuln/410875/cti
third-party-advisory
https://vuldb.com/cve/CVE-2026-101005
third-party-advisory
https://vuldb.com/submit/922294
related
https://github.com/octobercms/october/security/advisories/GHSA-j2j7-7m99-6226
exploit
https://github.com/0xGenesi/CVE/blob/main/October_CMS_SSRF_IPv6_Mapped_IPv4_Bypass.md
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