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    CVE-2021-36403

    In Moodle, in some circumstances, email notifications of messages could have the link back to the original message hidden by HTML, which may pose a phishing risk.

    Published:Mar 6, 2023
    Last Modified:Mar 7, 2025
    EPS:Mar 6, 2023
    EPSS Score:0.00166
    CVSS Score:5.3

    Affected Products

    Vendor
    Moodle
    Product
    Moodle

    Exploits

    No exploit reference

    Common Weakness Enumeration

    CWE-912 Hidden Functionality

    Related CVEs

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    CVE-2026-26047 (CVSS 6.5) — A denial-of-service vulnerability was identified in Moodle’s TeX formula editor. When rendering TeX content us…
    CVE-2026-26046 (CVSS 7.2) — A vulnerability was found in a Moodle TeX filter administrative setting where insufficient sanitization of con…
    CVE-2026-26045 (CVSS 7.2) — A flaw was identified in Moodle’s backup restore functionality where specially crafted backup files were not p…
    CVE-2025-67857 (CVSS 4.3) — A flaw was found in moodle. During anonymous assignment submissions, user identifiers were inadvertently expos…
    CVE-2025-67856 (CVSS 5.4) — A flaw was found in Moodle. An authorization logic flaw, specifically due to incomplete role checks during the…
    CVE-2025-67855 (CVSS 5.4) — A flaw was found in mooodle. A remote attacker could exploit a reflected Cross-Site Scripting (XSS) vulnerabil…
    CVE-2025-67853 (CVSS 7.5) — A flaw was found in Moodle. A remote attacker could exploit a lack of proper rate limiting in the confirmation…
    CVE-2025-67852 (CVSS 3.5) — A flaw was found in Moodle. An open redirect vulnerability in the OAuth login flow allows a remote attacker to…

    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