October Rain has Environment Variable Exfiltration via INI Parser Interpolation
A server-side information disclosure vulnerability was identified in the INI settings parser. PHP's parse_ini_string() function supports ${} syntax for environment variable interpolation. Attackers with Editor access could inject ${APP_KEY}, ${DB_PASSWORD}, or similar patterns into CMS page settings fields, causing sensitive environment variables to be resolved and stored in the template. These values were then returned to the attacker when the page was reopened.
Impact
- Exfiltration of sensitive environment variables (APP_KEY, DB credentials, AWS keys, etc.)
- Could enable further attacks: database access, cookie forgery, AWS resource access
- Requires authenticated backend access with Editor permissions
- Only relevant when
cms.safe_modeis enabled (otherwise direct PHP injection is already possible)
Patches
The vulnerability has been patched in v3.7.14 and v4.1.10. All users are encouraged to upgrade to the latest patched version.
Workarounds
If upgrading immediately is not possible:
- Restrict Editor tool access to fully trusted administrators only
- Ensure database and cloud service credentials are not accessible from the web server's network
References
- Reported by Pentest-Tools.com
Affected software
Click a technology to see all vulnerabilities affecting it.
| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Composer package | october/rain | >= 4.0.0, < 4.1.10, < 3.7.14 | 4.1.10, 3.7.14 |
References
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N- Weakness (CWE)
CWE-200, CWE-94- Platform
- Composer
- Package
october/rain- Disclosed
- 14.04.2026
- Updated
- 11.10.2026 10:22
Sources and licenses
OSV / GitHub Advisory Database - GHSA-g6v3-wv4j-x9hg - CC BY 4.0
Vulnerability history: october/rain
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
- 6
- First → latest
- 08.2020 04.2026
- Without a fix
- 0
- Exploited in attacks
- 0
Severity breakdown
- Critical 1
- Medium 5
Disclosures per year
- 2020: 1
- 2021: 1
- 2022: 1
- 2023: 0
- 2024: 0
- 2025: 0
- 2026: 3
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October Rain has Environment Variable Exfiltration via INI Parser Interpolation this entry
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