EUVD-2026-26892CVSS VectorNVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N
Lifecycle Timeline
4DescriptionNVD
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.
AnalysisAI
Host header injection in phpBB versions 3.0.0 through 3.3.15 enables password reset link poisoning when force_server_vars is disabled. Attackers manipulating HTTP Host headers can redirect password reset links to attacker-controlled domains, enabling credential theft and account takeover. …
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RemediationAI
Within 24 hours: Identify all phpBB deployments and confirm versions via /phpbb/phpbb/version.php or admin panel; document force_server_vars configuration status. Within 7 days: Upgrade to phpBB 3.3.16 or later on all affected instances; verify force_server_vars is enabled post-upgrade. …
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External POC / Exploit Code
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