High severity · published Sep 28, 2026
CVE-2026-100909
OctoberCMS ResizeImages.php getSourcePathForResize server-side request forgery
7.3
CVSS
0.3%
EPSS
No
On KEV
Description
A vulnerability was found in OctoberCMS up to 4.1.19/4.2.25/4.3.4. The impacted element is the function getSourcePathForResize of the file modules/system/classes/ResizeImages.php. The manipulation of the argument realSourcePath results in server-side request forgery. The attack may be performed from remote. The exploit has been made public and could be used. Upgrading to version 4.3.5 and 4.4.0 is sufficient to resolve this issue. The patch is identified as 0e9736aa2c6d6bd3d60ff6ef9e0b4d32ce387f58. The affected component should be upgraded.
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
OctoberCMS · Octobercms
4.1.0; 4.1.1; 4.1.2; 4.1.3; 4.1.4; 4.1.5; +34 more · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-100909
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-100909
vdb-entry
https://vuldb.com/vuln/410869
signature
https://vuldb.com/vuln/410869/cti
third-party-advisory
https://vuldb.com/cve/CVE-2026-100909
third-party-advisory
https://vuldb.com/submit/919993
related
https://github.com/octobercms/october/security/advisories/GHSA-2xmm-m4wv-3fjh
exploit
https://github.com/0xGenesi/CVE/blob/main/October_CMS_Stream_Wrapper_Injection.md