Answer in brief
CVE-2026-100909 records a Medium severity (CVSS 6.9) vulnerability in OctoberCMS ResizeImages.php getSourcePathForResize server-side request forgery. The current sources do not mark it as known exploited. The current feed maps n/a/OctoberCMS (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 6.9. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps n/a/OctoberCMS (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| n/a/OctoberCMSgeneric | 4.1.0 || 4.1.1 || 4.1.2 || 4.1.3 || 4.1.4 || 4.1.5 || 4.1.6 || 4.1.7 || 4.1.8 || 4.1.9 || 4.1.10 || 4.1.11 || 4.1.12 || 4.1.13 || 4.1.14 || 4.1.15 || 4.1.16 || 4.1.17 || 4.1.18 || 4.1.19 || 4.2.0 || 4.2.1 || 4.2.2 || 4.2.3 || 4.2.4 || 4.2.5 || 4.2.6 || 4.2.7 || 4.2.8 || 4.2.9 || 4.2.10 || 4.2.11 || 4.2.12 || 4.2.13 || 4.2.14 || 4.2.15 || 4.2.16 || 4.2.17 || 4.2.18 || 4.2.19 || 4.2.20 || 4.2.21 || 4.2.22 || 4.2.23 || 4.2.24 || 4.2.25 || 4.3.0 || 4.3.1 || 4.3.2 || 4.3.3 || 4.3.4 | Not reported |
Published upstream
Sep 28, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Sep 28, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Sep 28, 2026
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.
Quoted source text, attributed separately from HOL analysis.