October CMS SSRF Protection ResizeImages.php validateExternalImageHost server-side request forgery
Priority HIGH 70CWE-918Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Attack requirements
- None
- Impact type
- —
- Confidentiality · integrity · availability
- Low · Low · Low
- Fix status
- Fixed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA.
Summary
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.
Why it matters now
Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00298 22nd percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by the CNA
Fix Fixed October CMS: 4.3.5
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- Automatable
- Yes
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | October CMS | 4.3.0; 4.3.1; 4.3.2; 4.3.3; 4.3.4 | 4.3.5 | Patch available | CNA |
- October CMS Vendor— Affected 4.3.0; 4.3.1; 4.3.2; 4.3.3; 4.3.4 Fixed in 4.3.5 Patch available CNA
CPE names CNA · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:october_cms:october_cms:*:*:*:*:*:*:*:* | — | — | — |
- cpe:2.3:a:october_cms:october_cms:*:*:*:*:*:*:*:* Versions — — ·—
Remediation
- Fix · CNA October CMS Fixed in 4.3.5
Timeline
- 2026-10-02 Threatist record created from CVE-2026-101005
- 2026-10-03 Alias added: GHSA-43c9-ch4w-3vh5
References
Sources
- CVE-2026-101005 · CVE Program
- CVE-2026-101005 · NVD
- FIRST EPSS
- GHSA-43c9-ch4w-3vh5 · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences