October CMS SSRF Protection ResizeImages.php validateExternalImageHost server-side request forgery
Published Sep 28, 2026
6.9
MEDIUMCVSS 4.0
EPSS 0.30%
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.
Affected products
-
- Version 4.3.0StatusaffectedConstraints-
- Version 4.3.1StatusaffectedConstraints-
- Version 4.3.2StatusaffectedConstraints-
- Version 4.3.3StatusaffectedConstraints-
- Version 4.3.4StatusaffectedConstraints-
- Version 4.3.5StatusunaffectedConstraints-
- Version
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | |||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| October Cms | October CMS | n/a |
|
No data.
No data.
No Red Hat product state for this CVE.
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
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
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
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
AV:N/AC:L/Au:N/C:P/I:P/A:P/E:POC/RL:OF/RC:C
This CVE is not in the KEV list.
CISA SSVC (Vulnrichment)
Stakeholder-Specific Vulnerability Categorization from CISA ADP.
Exploitation
PoCAutomatable
YesTechnical Impact
PartialDecision
n/aAssessed Sep 28, 2026 · SSVC 2.0.3
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
Score over time
Not enough EPSS history yet for a chart. At least two recorded scores are needed.
Percentile over time
Not enough EPSS history yet for a chart. At least two recorded scores are needed.
References (8)
- https://github.com/0xGenesi/CVE/blob/main/October_CMS_SSRF_IPv6_Mapped_IPv4_Bypass.md exploit
- https://github.com/octobercms/october/releases/tag/v4.3.5 patch
- https://github.com/octobercms/october/security/advisories/GHSA-j2j7-7m99-6226 related
- https://vuldb.com/cve/CVE-2026-101005 third-party-advisory
- https://vuldb.com/submit/922294 third-party-advisory
- https://vuldb.com/vuln/410875 vdb-entrytechnical-description
- https://vuldb.com/vuln/410875/cti signaturepermissions-required
- https://www.cybersecurity-help.cz/vdb/vulns/149488/ related
| Link | Providers | Tags |
|---|---|---|
| https://github.com/0xGenesi/CVE/blob/main/October_CMS_SSRF_IPv6_Mapped_IPv4_Bypass.md | exploit | |
| https://github.com/octobercms/october/releases/tag/v4.3.5 | patch | |
| https://github.com/octobercms/october/security/advisories/GHSA-j2j7-7m99-6226 | related | |
| https://vuldb.com/cve/CVE-2026-101005 | third-party-advisory | |
| https://vuldb.com/submit/922294 | third-party-advisory | |
| https://vuldb.com/vuln/410875 | vdb-entrytechnical-description | |
| https://vuldb.com/vuln/410875/cti | signaturepermissions-required | |
| https://www.cybersecurity-help.cz/vdb/vulns/149488/ | related |
Change history (0)
No recorded changes yet.