October CMS vulnerable to Potential Host Header Poisoning on misconfigured servers
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- None · High · None
- Fix status
- Fixed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA and GitHub.
Summary
October is a free, open-source, self-hosted CMS platform based on the Laravel PHP Framework. In October before version 1.1.2, when running on poorly configured servers (i.e. the server routes any request, regardless of the HOST header to an October CMS instance) the potential exists for Host Header Poisoning attacks to succeed. This has been addressed in version 1.1.2 by adding a feature to allow a set of trusted hosts to be specified in the application. As a workaround one may set the configuration setting cms.linkPolicy to force.
Why it matters now
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| October CMS | october | before 1.1.2 | 1.1.2 | Patch available | CNA |
| — | october/backend (Packagist) | before 1.1.2 | 1.1.2 | Patch available | GHSA-xhfx-hgmf-v6vp |
- october VendorOctober CMS Affected before 1.1.2 Fixed in 1.1.2 Patch available CNA
- october/backend (Packagist) Vendor— Affected before 1.1.2 Fixed in 1.1.2 Patch available GHSA-xhfx-hgmf-v6vp
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:octobercms:october:*:*:*:*:*:*:*:* | before 1.1.2 | Vulnerable | October CMS |
- cpe:2.3:a:octobercms:october:*:*:*:*:*:*:*:* Versions before 1.1.2 Vulnerable ·October CMS
Remediation
- Fix · CNA october (octobercms) Fixed in 1.1.2
- Fix · GHSA-xhfx-hgmf-v6vp october/backend (Packagist) Fixed in 1.1.2 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2021-21265
- 2026-10-03 Alias added: GHSA-xhfx-hgmf-v6vp
References
Patch 3
More October CMS October vulnerabilities
- TI-2021-12316 Account Takeover in Octobercms KEVCVSS 3.1CRITICAL 9.1
- TI-2021-12318 Arbitrary code execution in october/system CVSS 3.1HIGH 8.8
- TI-2017-14456 October CMS build 412 is vulnerable to PHP code execution in the file upload… CVSS 3.0HIGH 7.2
- TI-2023-23545 A Cross-Site Scripting (XSS) vulnerability in installation of October v.3.4.16 allows an… CVSS 3.1MEDIUM 5.4
- TI-2023-19223 An arbitrary file upload vulnerability in October CMS v3.4.4 allows attackers to execute… CVSS 3.1MEDIUM 5.4
- TI-2024-30847 October 3.6.30 allows an authenticated admin account to upload a PDF file containing… CVSS 3.1MEDIUM 4.7
Sources
- CVE-2021-21265 · CVE Program
- CVE-2021-21265 · NVD
- FIRST EPSS
- GHSA-xhfx-hgmf-v6vp · GitHub Advisory Database · CC BY 4.0
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