October CMS upload process vulnerable to RCE via Race Condition
Impact
This advisory affects plugins that expose the October\Rain\Database\Attach\File::fromData as a public interface. This vulnerability does not affect vanilla installations of October CMS since this method is not exposed or used by the system internally or externally.
When the developer allows the user to specify their own filename in the fromData method, an unauthenticated user can perform remote code execution (RCE) by exploiting a race condition in the temporary storage directory.
Patches
The issue has been patched in Build 476 (v1.0.476) and v1.1.12 and v2.2.15.
Workarounds
Apply https://github.com/octobercms/library/commit/fe569f3babf3f593be2b1e0a4ae0283506127a83 to your installation manually if unable to upgrade to Build 476 (v1.0.476) or v1.1.12 or v2.2.15.
References
Credits to:
- DucNT, HungTD and GiangVQ from RedTeam@VNG Security Response Center.
For more information
If you have any questions or comments about this advisory:
- Email us at hello@octobercms.com
Affected software
Click a technology to see all vulnerabilities affecting it.
| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Composer package | october/system | < 1.0.476, >= 1.1.0, < 1.1.12, >= 2.0.0, < 2.2.15 | 1.0.476, 1.1.12, 2.2.15 |
References
- CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H- Weakness (CWE)
CWE-362- Platform
- Composer
- Package
october/system- Disclosed
- 13.07.2022
- Updated
- 11.10.2026 10:22
Sources and licenses
OSV / GitHub Advisory Database - GHSA-8v7h-cpc2-r8jp - CC BY 4.0
Vulnerability history: october/system
All published vulnerabilities of this package (Composer package), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 25
- First → latest
- 06.2020 09.2026
- Without a fix
- 0
- Exploited in attacks
- 1
Severity breakdown
- Critical 1
- High 8
- Medium 9
- Low 7
Disclosures per year
- 2020: 1
- 2021: 3
- 2022: 6
- 2023: 3
- 2024: 2
- 2025: 1
- 2026: 9
-
October CMS upload process vulnerable to RCE via Race Condition this entry
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