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CVE-2026-29199 - Vulnerability Analysis

HighCVSS: 8.1

Last Updated: May 4, 2026

phpBB - Host Header Injection

Published: May 4, 2026Updated: May 4, 2026Remote Exploitable

Overview

phpBB < 3.3.16 contains a host header injection caused by improper validation of the HTTP Host header when force_server_vars is disabled, letting attackers poison password reset links, exploit requires ability to manipulate Host header.

Severity & Score

Severity: High

CVSS Score: 8.1

Impact

Attackers can poison password reset links to point to attacker-controlled domains, potentially leading to account takeover.

Mitigation

Update to version 3.3.16 or later.

References

https://hackerone.com/reports/3543246

Related Resources

Vulnerability Intelligence Dashboard
Credential Scanner

Details

CVE ID: CVE-2026-29199
Severity: High
CVSS Score: 8.1
Type: host_header_injection
Status: new

CWE

CWE-640

CVSS Metrics

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