CVE-2026-29199 phpBB has Password Reset Link Poisoning via Host Header injection
Attackers can poison password reset links via Host Header Injection to take over user accounts when server variable forcing is disabled.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-29199?
CVE-2026-29199 is a high-severity vulnerability in phpBB, published on 4 May 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
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.
Weakness: CWE-640
Which versions are affected by CVE-2026-29199?
4 open source packages ship an affected version, including phpbb/phpbb. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
phpbb/phpbb Packagist | From 3.0.0 | 3.3.16 |
phpbb/phpbb Packagist | From 3.0.0 | 3.3.16 |
phpbb/phpbb Packagist | From 4.0.0-a1 | 4.0.0-a2 |
phpbb/phpbb Packagist | From 4.0.0-a1 | 4.0.0-a2 |
Products include Phpbb Phpbb.
How do I fix CVE-2026-29199?
Upgrade phpbb/phpbb to a fixed version for your release line: 3.3.16 or 4.0.0-a2.
Is CVE-2026-29199 being exploited?
There is no known exploitation of CVE-2026-29199 in the wild and no public exploit code.
Other vulnerabilities in phpBB
- CVE-2008-3224 Other in n/a
- CVE-2008-1766 Multiple unspecified vulnerabilities in phpBB before 3.0.1 have unknown impact and attack vectors, related to "two minor security-related bu
- CVE-2025-70810 Cross-site request forgery in n/a
- CVE-2001-1471 Code injection in n/a
- CVE-2019-16108 phpBB arbitrary CSS injection
Sources
Also known as GHSA-7gm6-w7mx-58cr.