phpBB has Password Reset Link Poisoning via Host Header injection
phpBB before 3.3.16 is vulnerable to Host Header Injection that can lead to password rest link poisoning. When force_server_vars is disabled, the servers hostname may be extracted from the HTTP Host header which is used to generate the password reset link URL. An attacker who can manipulate the Host header (e.g. through misconfigured host setup or missing header validation by the webserver) can cause password reset emails to contain a link pointing to an attacker-controlled domain, potentially leading to account takeover.
Affected software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Composer package | phpbb/phpbb | >= 3.0.0, < 3.3.16, >= 4.0.0-a1, < 4.0.0-a2 | 3.3.16, 4.0.0-a2 |
References
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N- Weakness (CWE)
CWE-640- Platform
- Composer
- Package
phpbb/phpbb- Disclosed
- 04.05.2026
- Updated
- 11.10.2026 10:22
Sources and licenses
OSV / GitHub Advisory Database - GHSA-7gm6-w7mx-58cr - CC BY 4.0
Vulnerability history: phpbb/phpbb
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
- 16
- First → latest
- 05.2022 05.2026
- Without a fix
- 0
- Exploited in attacks
- 0
Severity breakdown
- High 8
- Medium 8
Disclosures per year
- 2022: 14
- 2023: 1
- 2024: 0
- 2025: 0
- 2026: 1
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phpBB has Password Reset Link Poisoning via Host Header injection this entry
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