Vulnerability in phpBB
CVE-2026-29199
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.
EPSS: 0.002 (16.3th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N.
Affected products
- Phpbb — versions 3.0.0
Weakness classification (CWE)
References
- support@hackerone.com (Permissions Required)
Frequently asked questions
- What is CVE-2026-29199?
- CVE-2026-29199 is a high-severity vulnerability in phpBB, classified under Weak Password Recovery Mechanism for Forgotten Password. CVSS score: 8.1/10. Published 2026-05-04.
- How severe is CVE-2026-29199?
- High severity. CVSS v3 base score is 8.1 out of 10.