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    CVE-2026-48611

    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.

    Published:Jun 12, 2026
    Last Modified:Jul 31, 2026
    EPS:Jun 12, 2026
    EPSS Score:0.0386
    CVSS Score:9.8

    Affected Products

    Vendor
    Phpbb
    Product
    Phpbb

    Exploits

    https://github.com/Diznev/CVE-2026-48611-EXPLOIThttps://github.com/Ethicalgrey/phpBB-CVE-2026-48611https://github.com/wanmywan/CVE-2026-48611-phpBB

    Common Weakness Enumeration

    CWE-287 Improper Authentication

    Related CVEs

    CVE-2026-48613 (CVSS 5.9) — SQL injection vulnerability in phpBB profile field migration due to improper handling of user-supplied profile…
    CVE-2026-48612 (CVSS 8) — Improper state verification in the OAuth implementation could allow an attacker to manipulate the authenticati…
    CVE-2026-47366 (CVSS 7.2) — Improper verification of access permissions when modifying permissions through the Administration Control Pane…
    CVE-2026-29199 (CVSS 8.1) — phpBB before 3.3.16 is vulnerable to Host Header Injection that can lead to password rest link poisoning. When…
    CVE-2025-70810 (CVSS 8.8) — Cross Site Request Forgery vulnerability in Phpbb phbb3 v.3.3.15 allows a local attacker to execute arbitrary …
    CVE-2025-70811 (CVSS 4.3) — Cross Site Request Forgery vulnerability in Phpbb phbb3 v.3.3.15 allows a local attacker to execute arbitrary …
    CVE-2019-25685 — This CVE ID has been rejected or withdrawn by its CVE Numbering Authority.…
    CVE-2023-5917 (CVSS 2.4) — A vulnerability, which was classified as problematic, has been found in phpBB up to 3.3.10. This issue affects…
    CVE-2020-8226 (CVSS 5.8) — A vulnerability exists in phpBB <v3.2.10 and <v3.3.1 which allowed remote image dimensions check to be used to…
    CVE-2019-16108 (CVSS 7.5) — phpBB 3.2.7 allows adding an arbitrary Cascading Style Sheets (CSS) token sequence to a page through BBCode.…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High