BaseFortify

Publication date: 2026-06-12

Last updated on: 2026-06-17

Assigner: HackerOne

Description

Improper authentication checks in the OAuth implementation allow account hijacking even when OAuth is not configured or enabled leading to unauthorized access in default installations.

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-06-12

Last Modified

2026-06-17

Generated

2026-10-11

AI Q&A

2026-06-12

EPSS Evaluated

2026-10-09

NVD

CVE-2026-48611

EUVD

EUVD-2026-36375

Affected Vendors & Products

Vendor	Product	Version / Range
phpBB	phpBB	3.3.0

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-287	When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct.

Attack-Flow Graph

Executive Summary

This vulnerability involves improper authentication checks in the OAuth implementation. It allows attackers to hijack user accounts even when OAuth is not configured or enabled, leading to unauthorized access in default installations.

Impact Analysis

The vulnerability can lead to unauthorized access to user accounts, resulting in account hijacking. This can compromise confidentiality, integrity, and availability of the affected system or data.

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