Vulnerability Report

CVE-2026-29199

Title: Host Header Injection

Other

Proof Of Concept

No public PoC currently indexed for CVE-2026-29199.

CWE Category CWE-640

Published Date May 04, 2026

Modified Date May 29, 2026

Exploit Status Not Found

Score 8.1 CVSS v3.1

Exploit Probability (EPSS)

0.25%

Vulnerability Summary

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 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.

Impacted Vendors

phpbb 1

phpbb_group 1

Reference Links

https://hackerone.com/reports/3543246

CVSS v3.1

Source Entity 134c704f-9b21-4f2e-91b3-4a467353bcc0

Severity HIGH

8.1

Attack Vector

NETWORK

Complexity

LOW

Privileges

N/A

Interaction

REQUIRED

Confidentiality

N/A

Integrity

N/A

Availability

N/A

Scope

UNCHANGED

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

Associated Attack Patterns (CAPEC)

Total: Patterns

CVE-2026-29199 Exploits & PoCs (Proof Of Concept)

No public PoCs found in our database for this CVE.

May 29, 2026 MODIFIED

Vulnerability data updated via NVD.

May 07, 2026 MODIFIED

Vulnerability data updated via NVD.

May 07, 2026 MODIFIED

Vulnerability data updated via NVD.

Attack Vector Matrix

Access Vector NETWORK

Complexity LOW

Privileges N/A

Interaction REQUIRED

CVSS Vector String


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

Affected Stack

No specific products linked.