CVE-2026-100909 - Vulnerability Details

- OctoberCMS ResizeImages.php getSourcePathForResize server-side request forgery

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.

Published: 2026-09-28

Score: 6.9 Medium

EPSS: < 1% Very Low

KEV: No

Impact:

Action:

Analysis

Impact

OctoberCMS contains a server‑side request forgery flaw in the getSourcePathForResize function of ResizeImages.php. By manipulating the realSourcePath argument, an attacker can cause the application to fetch arbitrary URLs, potentially exposing internal resources or delivering malicious content to the CMS. This flaw falls under CWE‑918 and can lead to information disclosure or remote code execution if other vulnerabilities are combined.

Affected Systems

OctoberCMS versions 4.1.19, 4.2.25, and 4.3.4 are affected. The vulnerability resides in the modules/system/classes/ResizeImages.php file and is present in any OctoberCMS installation that has not been updated to the patched releases.

Risk and Exploitability

The CVSS score of 6.9 indicates moderate severity. EPSS is not available and the issue is not listed in CISA's KEV catalog. An attacker can exploit the flaw remotely via the image resize API; authentication is not required. The attack vector is inferred from the description, which states the exploit can be performed from remote. Given the lack of protection against external requests, the risk of successful exploitation is significant especially for publicly exposed sites.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

n/a

OctoberCMS

affected

Version	Status	Constraints
`4.1.0`	affected	—
`4.1.1`	affected	—
`4.1.2`	affected	—
`4.1.3`	affected	—
`4.1.4`	affected	—
`4.1.5`	affected	—
`4.1.6`	affected	—
`4.1.7`	affected	—
`4.1.8`	affected	—
`4.1.9`	affected	—
`4.1.10`	affected	—
`4.1.11`	affected	—
`4.1.12`	affected	—
`4.1.13`	affected	—
`4.1.14`	affected	—
`4.1.15`	affected	—
`4.1.16`	affected	—
`4.1.17`	affected	—
`4.1.18`	affected	—
`4.1.19`	affected	—
`4.2.0`	affected	—
`4.2.1`	affected	—
`4.2.2`	affected	—
`4.2.3`	affected	—
`4.2.4`	affected	—
`4.2.5`	affected	—
`4.2.6`	affected	—
`4.2.7`	affected	—
`4.2.8`	affected	—
`4.2.9`	affected	—
`4.2.10`	affected	—
`4.2.11`	affected	—
`4.2.12`	affected	—
`4.2.13`	affected	—
`4.2.14`	affected	—
`4.2.15`	affected	—
`4.2.16`	affected	—
`4.2.17`	affected	—
`4.2.18`	affected	—
`4.2.19`	affected	—
`4.2.20`	affected	—
`4.2.21`	affected	—
`4.2.22`	affected	—
`4.2.23`	affected	—
`4.2.24`	affected	—
`4.2.25`	affected	—
`4.3.0`	affected	—
`4.3.1`	affected	—
`4.3.2`	affected	—
`4.3.3`	affected	—
`4.3.4`	affected	—
`4.3.5`	unaffected	—
`4.4.0`	unaffected	—

No data.

Vendor Product Confidence Versions

Octobercms

95%

Version	Status	Scheme	Platform
`4.1.0`	affected	semver	—
`4.1.1`	affected	semver	—
`4.1.2`	affected	semver	—
`4.1.3`	affected	semver	—
`4.1.4`	affected	semver	—
`4.1.5`	affected	semver	—
`4.1.6`	affected	semver	—
`4.1.7`	affected	semver	—
`4.1.8`	affected	semver	—
`4.1.9`	affected	semver	—
`4.1.10`	affected	semver	—
`4.1.11`	affected	semver	—
`4.1.12`	affected	semver	—
`4.1.13`	affected	semver	—
`4.1.14`	affected	semver	—
`4.1.15`	affected	semver	—
`4.1.16`	affected	semver	—
`4.1.17`	affected	semver	—
`4.1.18`	affected	semver	—
`4.1.19`	affected	semver	—
`4.2.0`	affected	semver	—
`4.2.1`	affected	semver	—
`4.2.2`	affected	semver	—
`4.2.3`	affected	semver	—
`4.2.4`	affected	semver	—
`4.2.5`	affected	semver	—
`4.2.6`	affected	semver	—
`4.2.7`	affected	semver	—
`4.2.8`	affected	semver	—
`4.2.9`	affected	semver	—
`4.2.10`	affected	semver	—
`4.2.11`	affected	semver	—
`4.2.12`	affected	semver	—
`4.2.13`	affected	semver	—
`4.2.14`	affected	semver	—
`4.2.15`	affected	semver	—
`4.2.16`	affected	semver	—
`4.2.17`	affected	semver	—
`4.2.18`	affected	semver	—
`4.2.19`	affected	semver	—
`4.2.20`	affected	semver	—
`4.2.21`	affected	semver	—
`4.2.22`	affected	semver	—
`4.2.23`	affected	semver	—
`4.2.24`	affected	semver	—
`4.2.25`	affected	semver	—
`4.3.0`	affected	semver	—
`4.3.1`	affected	semver	—
`4.3.2`	affected	semver	—
`4.3.3`	affected	semver	—
`4.3.4`	affected	semver	—
`4.3.5`	unaffected	semver	—
`4.4.0`	unaffected	semver	—

Found an issue or want to improve our Enrichment? You can suggest it directly by opening an issue on our dedicated GitHub repository .

Remediation

No solution or workaround provided in the CVE record.

OpenCVE Recommended Actions

Upgrade OctoberCMS to version 4.3.5 or later, which includes patch 0e9736aa2c6d6bd3d60ff6ef9e0b4d32ce387f58.
If an upgrade is not immediately possible, restrict access to the image‑resize functionality by blocking external requests at the web‑server level or within the CMS configuration.
Actively monitor web‑server logs for abnormal image‑resizing requests and block suspicious IPs or patterns.

Generated by OpenCVE AI on September 28, 2026 at 05:20 UTC.

Tracking

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Advisories

No advisories yet.

Attack Vector Network

Attack Complexity Low

Privileges Required None

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact Low

Vulnerable System Integrity Impact Low

Vulnerable System Availability Impact Low

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact Low

Integrity Impact Low

Availability Impact Low

User Interaction None

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact Low

Integrity Impact Low

Availability Impact Low

User Interaction None

Access Vector Network

Access Complexity Low

Authentication None

Confidentiality Impact Partial

Integrity Impact Partial

Availability Impact Partial

This CVE is not in the KEV list.

The EPSS score is 0.00298.

Exploitation poc

Automatable yes

Technical Impact partial

References

Link	Providers
https://github.com/0xGenesi/CVE/blob/main/October_CMS_Stream_Wrapper_Injection.md
https://github.com/octobercms/october/commit/0e9736aa2c6d6bd3d60ff6ef9e0b4d32ce387f58
https://github.com/octobercms/october/releases/tag/v4.3.5
https://github.com/octobercms/october/security/advisories/GHSA-2xmm-m4wv-3fjh
https://vuldb.com/cve/CVE-2026-100909
https://vuldb.com/submit/919993
https://vuldb.com/vuln/410869
https://vuldb.com/vuln/410869/cti

History

Mon, 28 Sep 2026 13:30:00 +0000

Type	Values Removed	Values Added
Metrics		ssvc `{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}`

Mon, 28 Sep 2026 04:45:00 +0000

Type	Values Removed	Values Added
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.
Title		OctoberCMS ResizeImages.php getSourcePathForResize server-side request forgery
First Time appeared		Octobercms Octobercms octobercms
Weaknesses		CWE-918
CPEs		cpe:2.3:a:octobercms:octobercms::::::::
Vendors & Products		Octobercms Octobercms octobercms
References		https://github.com/0xGenesi/CVE/blob/main/October_CMS_Stream_Wrapper_Injection.md https://github.com/octobercms/october/commit/0e9736aa2c6d6bd3d60ff6ef9e0b4d32ce387f58 https://github.com/octobercms/october/releases/tag/v4.3.5 https://github.com/octobercms/october/security/advisories/GHSA-2xmm-m4wv-3fjh https://vuldb.com/cve/CVE-2026-100909 https://vuldb.com/submit/919993 https://vuldb.com/vuln/410869 https://vuldb.com/vuln/410869/cti
Metrics		cvssV2_0 `{'score': 7.5, 'vector': 'AV:N/AC:L/Au:N/C:P/I:P/A:P/E:POC/RL:OF/RC:C'}` cvssV3_0 `{'score': 7.3, 'vector': 'CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P/RL:O/RC:C'}` cvssV3_1 `{'score': 7.3, 'vector': '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'}` cvssV4_0 `{'score': 6.9, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P'}`

Subscriptions

Octobercms Octobercms

MITRE

Status: PUBLISHED

Assigner: VulDB

Published: 2026-09-28T04:30:10.101Z

Updated: 2026-09-28T12:48:33.093Z

Reserved: 2026-09-27T10:19:16.000Z

Link: CVE-2026-100909

Vulnrichment

Updated: 2026-09-28T12:48:27.780Z

NVD

Status : Deferred

Published: 2026-09-28T05:16:30.067

Modified: 2026-09-28T15:16:04.793

Link: CVE-2026-100909

Redhat

No data.

OpenCVE Enrichment

Updated: 2026-09-28T06:00:12Z

Weaknesses

CWE-918
Server-Side Request Forgery (SSRF)

Impact

Affected Systems

Risk and Exploitability

Tracking

Attack Vector Network

Attack Complexity Low

Privileges Required None

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact Low

Vulnerable System Integrity Impact Low

Vulnerable System Availability Impact Low

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact Low

Integrity Impact Low

Availability Impact Low

User Interaction None

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact Low

Integrity Impact Low

Availability Impact Low

User Interaction None

Access Vector Network

Access Complexity Low

Authentication None

Confidentiality Impact Partial

Integrity Impact Partial

Availability Impact Partial

Exploitation poc

Automatable yes

Technical Impact partial

Subscriptions

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