CVE-2026-29199: phpBB · Weak Password Recovery
Affects phpBBSource GCVE Database
Not known to be exploited · CVSS 8.1 High : upgrade to 3.3.16 soon.
Data as of 27 Oct 2026, 01:24 UTC
- Patch
- Available – fixed in 3.3.16
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:NExploitation evidence
Disclosed: evidence found.
CVE published 4 May 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.
What to do
Upgrade phpBB to 3.3.16.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| phpBB phpBB | Affected
| Fixed in
|
AI-suggested
A fix is available in phpBB version 3.3.16 and later. Users should upgrade to version 3.3.16 or newer to remediate this vulnerability. Until patched, ensure that the force_server_vars setting is enabled to prevent the server from relying on the HTTP Host header for generating password reset URLs. Additionally, validate and restrict Host header values at the webserver level to prevent manipulation.
Description
phpBB versions before 3.3.16 have a vulnerability in their password recovery mechanism due to Host Header Injection. This flaw allows an attacker who can manipulate the HTTP Host header to poison password reset links sent via email. The vulnerability arises when the force_server_vars setting is disabled, causing the server to use the Host header to generate reset URLs. Exploiting this can lead to password reset emails containing links to attacker-controlled domains, potentially enabling account takeover.