What is CVE-2026-29199?

CVE-2026-29199 is a high-severity vulnerability in Phpbb, classified under Weak Password Recovery Mechanism for Forgotten Password. CVSS score: 8.1/10. Published 2026-05-04.

How severe is CVE-2026-29199?

High severity. CVSS v3 base score is 8.1 out of 10.

Vulnerability in Phpbb

CVE-2026-29199

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 pas…

EPSS: 0.000 (9.1th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N.

Affected products

Phpbb — versions 3.0.0

Weakness classification (CWE)

CWE-640 — Weak Password Recovery Mechanism for Forgotten Password

References

support@hackerone.com (Permissions Required)

Frequently asked questions

What is CVE-2026-29199?: CVE-2026-29199 is a high-severity vulnerability in Phpbb, classified under Weak Password Recovery Mechanism for Forgotten Password. CVSS score: 8.1/10. Published 2026-05-04.
How severe is CVE-2026-29199?: High severity. CVSS v3 base score is 8.1 out of 10.