CVE-2026-101005: Server-Side Request Forgery in October CMS
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.
AI Analysis
Technical Summary
October CMS versions 4.3.0 to 4.3.4 contain an SSRF vulnerability in the validateExternalImageHost function of System/Classes/ResizeImages.php. This function is intended to protect against SSRF attacks but can be manipulated to cause the server to perform unauthorized HTTP requests. The vulnerability is remotely exploitable without authentication. A public exploit exists. The issue is resolved by upgrading to version 4.3.5.
Potential Impact
Successful exploitation of this SSRF vulnerability can allow an attacker to make arbitrary HTTP requests from the server, potentially accessing internal resources or services not otherwise exposed. The vulnerability does not require authentication and can be triggered remotely. The CVSS 4.0 base score is 6.9, indicating a medium severity impact with low attack complexity and no privileges required.
Mitigation Recommendations
Upgrade October CMS to version 4.3.5 or later to remediate this vulnerability. This official fix addresses the SSRF issue in the validateExternalImageHost function. No other mitigation steps are indicated by the vendor advisory.
CVE-2026-101005: Server-Side Request Forgery in October CMS
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 v4.0
Score 6.9medium
Affected software
October CMS
pkg:github/octobercms/octobercpe:2.3:a:october_cms:october_cms:*:*:*:*:*:*:*:*Run on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
October CMS versions 4.3.0 to 4.3.4 contain an SSRF vulnerability in the validateExternalImageHost function of System/Classes/ResizeImages.php. This function is intended to protect against SSRF attacks but can be manipulated to cause the server to perform unauthorized HTTP requests. The vulnerability is remotely exploitable without authentication. A public exploit exists. The issue is resolved by upgrading to version 4.3.5.
Potential Impact
Successful exploitation of this SSRF vulnerability can allow an attacker to make arbitrary HTTP requests from the server, potentially accessing internal resources or services not otherwise exposed. The vulnerability does not require authentication and can be triggered remotely. The CVSS 4.0 base score is 6.9, indicating a medium severity impact with low attack complexity and no privileges required.
Mitigation Recommendations
Upgrade October CMS to version 4.3.5 or later to remediate this vulnerability. This official fix addresses the SSRF issue in the validateExternalImageHost function. No other mitigation steps are indicated by the vendor advisory.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- VulDB
- Date Reserved
- 2026-09-27T10:41:52.940Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6aba0dbef7a7c541064c334a
Added to database: 09/28/2026, 06:48:30 UTC
Last enriched: 09/28/2026, 07:03:45 UTC
Last updated: 09/29/2026, 02:42:07 UTC
Views: 17
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