CVE-2026-29199 Vulnerability Analysis & Exploit Details

CVE-2026-29199
Vulnerability Scoring

8.1

/10

Severe Risk

Cybersecurity professionals consider CVE-2026-29199 an immediate threat requiring urgent mitigation.

Attack Complexity Details

Attack Complexity: Low
Exploits can be performed without significant complexity or special conditions.
Attack Vector: Network
Vulnerability is exploitable over a network without physical access.
Privileges Required: None
No privileges are required for exploitation.
Scope: Unchanged
Exploit remains within the originally vulnerable component.
User Interaction: Required
User interaction is necessary for successful exploitation.

CVE-2026-29199 Details

Status: Analyzed

Last updated: 🕧 29 May 2026, 12:57 UTC
Originally published on: 🕖 04 May 2026, 07:15 UTC

Time between publication and last update: 25 days

CVSS Release: version 3

CVSS3 Source

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

CVSS3 Type

Secondary

CVSS3 Vector

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

CVE-2026-29199 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.

Assessing the Risk of CVE-2026-29199

Access Complexity Graph

The exploitability of CVE-2026-29199 depends on two key factors: attack complexity (the level of effort required to execute an exploit) and privileges required (the access level an attacker needs).

Exploitability Analysis for CVE-2026-29199

With low attack complexity and no required privileges, CVE-2026-29199 is an easy target for cybercriminals. Organizations should prioritize immediate mitigation measures to prevent unauthorized access and data breaches.

Understanding AC and PR

A lower complexity and fewer privilege requirements make exploitation easier. Security teams should evaluate these aspects to determine the urgency of mitigation strategies, such as patch management and access control policies.

Attack Complexity (AC) measures the difficulty in executing an exploit. A high AC means that specific conditions must be met, making an attack more challenging, while a low AC means the vulnerability can be exploited with minimal effort.

Privileges Required (PR) determine the level of system access necessary for an attack. Vulnerabilities requiring no privileges are more accessible to attackers, whereas high privilege requirements limit exploitation to authorized users with elevated access.

CVSS Score Breakdown Chart

Above is the CVSS Sub-score Breakdown for CVE-2026-29199, illustrating how Base, Impact, and Exploitability factors combine to form the overall severity rating. A higher sub-score typically indicates a more severe or easier-to-exploit vulnerability.

CIA Impact Analysis

Below is the Impact Analysis for CVE-2026-29199, showing how Confidentiality, Integrity, and Availability might be affected if the vulnerability is exploited. Higher values usually signal greater potential damage.

Confidentiality: High
Exploiting CVE-2026-29199 can result in unauthorized access to sensitive data, severely compromising data privacy.
Integrity: High
CVE-2026-29199 could allow unauthorized modifications to data, potentially affecting system reliability and trust.
Availability: None
CVE-2026-29199 does not impact system availability.

CVE-2026-29199 References

External References

https://hackerone.com/reports/3543246

CWE Common Weakness Enumeration

CWE-640

CAPEC Common Attack Pattern Enumeration and Classification

Password Recovery Exploitation CAPEC-50 An attacker may take advantage of the application feature to help users recover their forgotten passwords in order to gain access into the system with the same privileges as the original user. Generally password recovery schemes tend to be weak and insecure.

Vulnerable Configurations

cpe:2.3:a:phpbb:phpbb:-:*:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:-:*:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:1.4.0:*:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:1.4.0:*:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.0.0:-:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.0.0:-:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.0.0:rc1:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.0.0:rc1:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.0.0:rc2:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.0.0:rc2:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.0.0:rc3:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.0.0:rc3:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.0.0:rc4:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.0.0:rc4:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.0.0:rc5:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.0.0:rc5:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.0.0:rc6:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.0.0:rc6:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.0.0:rc7:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.0.0:rc7:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.0.0:rc8:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.0.0:rc8:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.0.1:*:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.0.1:*:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.0.2:*:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.0.2:*:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.0.3:*:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.0.3:*:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.0.4:*:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.0.4:*:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.0.5:*:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.0.5:*:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.0.6:*:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.0.6:*:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.0.7:*:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.0.7:*:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.0.8:*:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.0.8:*:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.0.9:*:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.0.9:*:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.0.10:*:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.0.10:*:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.0.11:*:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.0.11:*:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.0.12:*:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.0.12:*:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.0.13:*:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.0.13:*:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.1.0:-:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.1.0:-:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.1.0:rc1:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.1.0:rc1:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.1.0:rc2:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.1.0:rc2:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.1.0:rc3:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.1.0:rc3:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.1.0:rc4:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.1.0:rc4:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.1.0:rc5:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.1.0:rc5:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.1.0:rc6:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.1.0:rc6:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.1.0:beta1:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.1.0:beta1:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.1.0:beta2:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.1.0:beta2:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.1.0:beta3:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.1.0:beta3:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.1.0:beta4:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.1.0:beta4:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.1.0:alpha1:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.1.0:alpha1:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.1.0:alpha2:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.1.0:alpha2:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.1.0:alpha3:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.1.0:alpha3:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.1.1:*:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.1.1:*:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.1.2:*:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.1.2:*:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.1.3:-:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.1.3:-:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.1.3:rc1:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.1.3:rc1:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.1.4:*:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.1.4:*:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.1.5:*:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.1.5:*:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.1.6:*:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.1.6:*:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.1.7:*:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.1.7:*:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.1.7:patch_level1:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.1.7:patch_level1:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.1.8:*:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.1.8:*:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.1.9:*:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.1.9:*:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.1.10:*:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.1.10:*:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.1.11:*:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.1.11:*:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.2.0:-:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.2.0:-:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.2.0:rc1:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.2.0:rc1:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.2.0:beta1:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.2.0:beta1:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.2.0:beta2:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.2.0:beta2:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.2.0:alpha1:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.2.0:alpha1:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.2.0:alpha2:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.2.0:alpha2:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.2.1:*:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.2.1:*:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.2.2:*:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.2.2:*:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.2.3:-:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.2.3:-:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.2.3:rc1:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.2.3:rc1:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.2.3:rc2:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.2.3:rc2:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.2.4:-:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.2.4:-:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.2.4:rc1:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.2.4:rc1:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.2.5:-:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.2.5:-:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.2.5:rc1:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.2.5:rc1:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.2.6:-:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.2.6:-:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.2.6:rc1:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.2.6:rc1:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.2.7:*:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.2.7:*:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.2.8:*:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.2.8:*:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.2.10:*:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.2.10:*:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.2.11:*:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.2.11:*:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.3.0:*:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.3.0:*:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.3.1:*:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.3.1:*:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.3.2:-:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.3.2:-:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.3.2:rc1:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.3.2:rc1:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.3.3:-:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.3.3:-:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.3.3:rc1:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.3.3:rc1:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.3.4:-:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.3.4:-:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.3.4:rc1:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.3.4:rc1:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.3.5:-:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.3.5:-:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.3.5:rc1:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.3.5:rc1:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.3.6:-:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.3.6:-:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.3.6:rc1:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.3.6:rc1:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.3.7:*:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.3.7:*:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.3.8:-:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.3.8:-:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.3.8:rc1:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.3.8:rc1:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.3.9:-:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.3.9:-:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.3.9:rc1:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.3.9:rc1:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.3.10:-:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.3.10:-:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.3.10:rc1:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.3.10:rc1:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.3.11:*:*:*:*:*:*:*
cpe:2.3:a:phpbb:phpbb:3.3.11:*:*:*:*:*:*:*

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