CVE-2026-29199highCWE-640

CVE-2026-29199: high-severity vulnerability in phpBB

Published

21Vexday Risk Score

No sign of exploitation. No public exploitation artifact known so far.

ssvc Trackcvss 8.1epss 0.4%
exploitation probability
0.4%top 64% of all CVEs
observed exploitation
nono source reports it
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.
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N
Affected products
phpBB · phpBB
Related CVEs — phpBB

In the same product, most dangerous first.

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References
https://hackerone.com/reports/3543246