Stored XSS by authenticated backend user with access to upload files
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- Required
- Attack complexity
- Low
- Impact type
- Cross-site scripting
- Confidentiality · integrity · availability
- Low · Low · None
- Fix status
- Fixed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA and GitHub. Impact type from CWE-79.
Summary
October is a free, open-source, self-hosted CMS platform based on the Laravel PHP Framework. In October CMS from version 1.0.319 and before version 1.0.469, backend users with access to upload files were permitted to upload SVG files without any sanitization applied to the uploaded files. Since SVG files support being parsed as HTML by browsers, this means that they could theoretically upload Javascript that would be executed on a path under the website's domain (i.e. /storage/app/media/evil.svg), but they would have to convince their target to visit that location directly in the target's browser as the backend does not display SVGs inline anywhere, SVGs are only displayed as image resources in the backend and are thus unable to be executed. Issue has been patched in Build 469 (v1.0.469) & v1.1.0.
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 | 1.0.319 to before 1.0.469 | 1.0.469 | Patch available | CNA |
| — | october/backend (Packagist) | 1.0.319 to before 1.0.469 | 1.0.469 | Patch available | GHSA-fx3v-553x-3c4q |
- october VendorOctober CMS Affected 1.0.319 to before 1.0.469 Fixed in 1.0.469 Patch available CNA
- october/backend (Packagist) Vendor— Affected 1.0.319 to before 1.0.469 Fixed in 1.0.469 Patch available GHSA-fx3v-553x-3c4q
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:octobercms:october:*:*:*:*:*:*:*:* | 1.0.319 to before 1.0.469 | Vulnerable | October CMS |
- cpe:2.3:a:octobercms:october:*:*:*:*:*:*:*:* Versions 1.0.319 to before 1.0.469 Vulnerable ·October CMS
Remediation
- Fix · CNA october (octobercms) Fixed in 1.0.469
- Fix · GHSA-fx3v-553x-3c4q october/backend (Packagist) Fixed in 1.0.469 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2020-15249
- 2026-10-03 Alias added: GHSA-fx3v-553x-3c4q
References
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-2020-15249 · CVE Program
- CVE-2020-15249 · NVD
- FIRST EPSS
- GHSA-fx3v-553x-3c4q · 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