CVE-2026-29199 — Vulnerability in phpbb/phpbb — CVE Details

HIGH

phpBB has Password Reset Link Poisoning via Host Header injection

Published May 4, 2026Updated September 10, 2026Source: osv

Summary

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.

Advisory Timeline

First published May 4, 2026 (161 days ago).
Last revised September 10, 2026 — 129 days after initial publication.

Remediation

Upgrade to the fixed version using your package manager.

Composer

Update phpbb/phpbb to 4.0.0-a2 or later

composer require "phpbb/phpbb:^4.0.0-a2"

Composer

Update phpbb/phpbb to 3.3.16 or later

composer require "phpbb/phpbb:^3.3.16"

After upgrading, run your dependency scanner again to confirm the vulnerability is resolved.

Affected Packages (2)

Affects 1 ecosystem: packagist (1).

Package	Ecosystem	Affected	Fixed In
phpbb/phpbb	packagist	4.0.0-a1	4.0.0-a2
phpbb/phpbb	packagist	3.0.12, 3.0.12-RC1, 3.0.12-RC2, 3.0.12-RC3 (+105 more)	3.3.16

Vulnerability Classification

Common Weakness Enumeration (CWE) identifiers for this vulnerability type.

CWE-640
View on MITRE

CVSS Score Breakdown

What the CVSS (Common Vulnerability Scoring System) 8.1 score means for each attack dimension.

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

None

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N

References

Frequently Asked Questions

What is CVE-2026-29199?: phpBB has Password Reset Link Poisoning via Host Header injection This vulnerability has been assigned a severity rating of HIGH (CVSS score: 8.1/10).
How do I check if my project is affected by CVE-2026-29199?: CVE-2026-29199 affects phpbb/phpbb. Use GeekWala's free vulnerability scanner to check your dependencies against CVE-2026-29199 and 200,000+ other known vulnerabilities.

Severity & Exploitability

CVSS Score

8.1

High exploitability or significant impact. Prioritize remediation within days.

Also Known As

GHSA-7gm6-w7mx-58cr

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