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Security Announcements

  • [20260520] - Framework - Inadequate content filtering within the cleanAttributes filter code

    • Project: Joomla!
    • SubProject: Framewok
    • Impact: Moderate
    • Severity: Moderate
    • Probability: Moderate
    • Versions: 3.0.0-5.4.5,6.0.0-6.1.0
    • Exploit type: XSS
    • Reported Date: 2026-05-04
    • Fixed Date: 2026-05-26
    • CVE Number: CVE-2026-48905

    Description

    Lack of input filtering leads to an XSS vector in the HTML filter code.

    Affected Installs

    Joomla! CMS versions 3.0.0-5.4.5,6.0.0-6.1.0

    Solution

    Upgrade to version 5.4.6,6.1.1

    Contact

    The JSST at the Joomla! Security Centre.

    Reported By:  Jesper den Boer

  • [20260519] - Framework - Inadequate content filtering within the checkAttribute filter code

    • Project: Joomla!
    • SubProject: Framewok
    • Impact: Moderate
    • Severity: Moderate
    • Probability: Moderate
    • Versions: 3.0.0-5.4.5,6.0.0-6.1.0
    • Exploit type: XSS
    • Reported Date: 2026-04-21
    • Fixed Date: 2026-05-26
    • CVE Number: CVE-2026-48903

    Description

    Inadequate content filtering within the checkAttribute methods leads to XSS vulnerabilities in various components.

    Affected Installs

    Joomla! CMS versions 3.0.0-5.4.5,6.0.0-6.1.0

    Solution

    Upgrade to version 5.4.6,6.1.1

    Contact

    The JSST at the Joomla! Security Centre.

    Reported By:  JSST

  • [20260518] - Core - Transport encryption downgrade for password and username reset links

    • Project: Joomla!
    • SubProject: CMS
    • Impact: Low
    • Severity: Low
    • Probability: Low
    • Versions: 3.9.0-5.4.5,6.0.0-6.1.0
    • Exploit type: Mixed Content
    • Reported Date: 2026-04-20
    • Fixed Date: 2026-05-26
    • CVE Number: CVE-2026-48902

    Description

    The password and username reset features created plain http links for https connections if the "Force SSL" flag wasn't explicitly set.

    Affected Installs

    Joomla! CMS versions 3.9.0-5.4.5,6.0.0-6.1.0

    Solution

    Upgrade to version 5.4.6,6.1.1

    Contact

    The JSST at the Joomla! Security Centre.

    Reported By:  ZeroXJacks, Github

  • [20260517] - Core - Incorrect Cache Key Construction for InputFilter objects

    • Project: Joomla!
    • SubProject: CMS
    • Impact: Low
    • Severity: Low
    • Probability: Low
    • Versions: 4.0.0-5.4.5,6.0.0-6.1.0
    • Exploit type: Incorrect Cache Key Construction
    • Reported Date: 2025-11-14
    • Fixed Date: 2026-05-26
    • CVE Number: CVE-2026-48901

    Description

    The InputFilter::getInstance() method omitted a security sensitive parameter from the instance cache key.

    Affected Installs

    Joomla! CMS versions 4.0.0-5.4.5,6.0.0-6.1.0

    Solution

    Upgrade to version 5.4.6,6.1.1

    Contact

    The JSST at the Joomla! Security Centre.

    Reported By:  ZeroXJacks, Github

  • [20260516] - Core - Incorrect Access Control in com_scheduler

    • Project: Joomla!
    • SubProject: CMS
    • Impact: Moderate
    • Severity: Low
    • Probability: Low
    • Versions: 4.1.0-5.4.5,6.0.0-6.1.0
    • Exploit type: Incorrect Access Control
    • Reported Date: 2026-04-29
    • Fixed Date: 2026-05-26
    • CVE Number: CVE-2026-48900

    Description

    An improper access check allowed low privileged users to edit the task types of existing scheduler tasks.

    Affected Installs

    Joomla! CMS versions 4.1.0-5.4.5,6.0.0-6.1.0

    Solution

    Upgrade to version 5.4.6,6.1.1

    Contact

    The JSST at the Joomla! Security Centre.

    Reported By:  Federico Brasili, Linkedin

  • [20260515] - Core - Incorrect Access Control in sample data plugins

    • Project: Joomla!
    • SubProject: CMS
    • Impact: High
    • Severity: Moderate
    • Probability: Moderate
    • Versions: 4.0.0-5.4.5,6.0.0-6.1.0
    • Exploit type: Incorrect Access Control
    • Reported Date: 2026-04-23
    • Fixed Date: 2026-05-26
    • CVE Number: CVE-2026-48899

    Description

    An improper access check allow unauthorized users to perform actions related to the installation of sampledata.

    Affected Installs

    Joomla! CMS versions 4.0.0-5.4.5,6.0.0-6.1.0

    Solution

    Upgrade to version 5.4.6,6.1.1

    Contact

    The JSST at the Joomla! Security Centre.

    Reported By:  廖双, JSST

  • [20260514] - Core - Privilege escalation through com_users webservice endpoints

    • Project: Joomla!
    • SubProject: CMS
    • Impact: High
    • Severity: Moderate
    • Probability: Low
    • Versions: 4.0.0-5.4.5,6.0.0-6.1.0
    • Exploit type: Privilege Escalation
    • Reported Date: 2026-04-15
    • Fixed Date: 2026-05-26
    • CVE Number: CVE-2026-48904

    Description

    An improper access check allows privelege escalation through the com_users group editing webservice endpoint.

    Affected Installs

    Joomla! CMS versions 4.0.0-5.4.5,6.0.0-6.1.0

    Solution

    Upgrade to version 5.4.6,6.1.1

    Contact

    The JSST at the Joomla! Security Centre.

    Reported By:  Christos Papakonstantinou, Cantina

  • [20260513] - Core - Privilege escalation through com_users batch task

    • Project: Joomla!
    • SubProject: CMS
    • Impact: High
    • Severity: High
    • Probability: Low
    • Versions: 4.0.0-5.4.5,6.0.0-6.1.0
    • Exploit type: Privilege Escalation
    • Reported Date: 2026-04-15
    • Fixed Date: 2026-05-26
    • CVE Number: CVE-2026-48898

    Description

    An improper access check allows privlege escalation through the com_users batch task.

    Affected Installs

    Joomla! CMS versions 4.0.0-5.4.5,6.0.0-6.1.0

    Solution

    Upgrade to version 5.4.6,6.1.1

    Contact

    The JSST at the Joomla! Security Centre.

    Reported By:  Adrian Junge aka vulno, Christos Papakonstantinou, Cantina

  • [20260512] - Core - MFA Authentication Bypass

    • Project: Joomla!
    • SubProject: CMS
    • Impact: High
    • Severity: Moderate
    • Probability: Moderate
    • Versions: 4.0.0-5.4.5,6.0.0-6.1.0
    • Exploit type: Authentication Bypass
    • Reported Date: 2026-04-01
    • Fixed Date: 2026-05-26
    • CVE Number: CVE-2026-48897

    Description

    Incorrectly resetted session states to a vector that allows to bypass 2FA checks.

    Affected Installs

    Joomla! CMS versions 4.0.0-5.4.5,6.0.0-6.1.0

    Solution

    Upgrade to version 5.4.6,6.1.1

    Contact

    The JSST at the Joomla! Security Centre.

    Reported By:  Morris Baumgarten-Egemole

  • [20260511] - Core - MFA Authentication Bypass

    • Project: Joomla!
    • SubProject: CMS
    • Impact: High
    • Severity: Moderate
    • Probability: Moderate
    • Versions: 4.0.0-5.4.5,6.0.0-6.1.0
    • Exploit type: Authentication Bypass
    • Reported Date: 2026-04-01
    • Fixed Date: 2026-05-26
    • CVE Number: CVE-2026-48896

    Description

    Insufficient state checks lead to a vector that allows to bypass 2FA checks.

    Affected Installs

    Joomla! CMS versions 4.0.0-5.4.5,6.0.0-6.1.0

    Solution

    Upgrade to version 5.4.6,6.1.1

    Contact

    The JSST at the Joomla! Security Centre.

    Reported By:  Doyensec in collaboration with Claude and Anthropic Research, Christos Papakonstantinou, Cantina

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