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CVE-2026-57831 – Unauthenticated SQL Injection – DPCalendar Extension for Joomla (versions 8.18.0…

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Summary

CVE-2026-57831 is a high-severity unauthenticated SQL injection vulnerability in the DPCalendar extension for Joomla, developed by digital-peak.com. The flaw allows any unauthenticated remote attacker to read the entire site database by sending a single crafted HTTP request to the extension’s publicly exposed events feed endpoint, with no privileges or user interaction required. The vulnerability carries a CVSS 4.0 score of 8.7 (High).

Technical details

  • Root cause: The filter_created_by parameter in the public events feed endpoint (index.php?option=com_dpcalendar&view=events&format=raw) is passed directly into a database query without integer casting or input sanitization, enabling blind SQL injection. The fix involves casting this parameter to an integer before the query executes, neutralizing any injected SQL syntax.
  • Trigger conditions: A single anonymous HTTP request to the public-facing events feed endpoint is sufficient to trigger the injection. No authentication, session, or special network position is required.
  • Attack vector: Network-accessible; the vulnerable endpoint is part of DPCalendar’s front-end calendar feed, exposed on any internet-facing Joomla site running the extension.
  • Impact: Successful exploitation yields full read access to the site database, exposing all user accounts, password hashes, Joomla configuration secrets, and stored credentials. In environments where the database server is configured with elevated privileges, the read access can extend beyond the Joomla database to all databases on the server. The confidentiality impact is rated High (VC:H) in the CVSS 4.0 vector.

Affected software

  • DPCalendar versions 8.18.0 through 10.11.1 (for Joomla 4, 5, and 6)
  • DPCalendar versions 8.x through 8.19.3 (for Joomla 3)
  • All product editions — Free, Standard, Professional, and Premium — contain identical vulnerable code and are equally affected.

Severity

CVSS 4.0 base score: 8.7 (High)
Vector string: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

Mitigation and recommended actions

  • Immediate action: Upgrade DPCalendar to version 10.11.2 (for Joomla 4/5/6) or 8.19.4 (for Joomla 3). The vendor shipped the patched releases within 24 hours of responsible disclosure; both releases are available from the digital-peak.com download portal.
  • If immediate patching is not feasible: Restrict access to the public events feed endpoint (index.php?option=com_dpcalendar&view=events&format=raw) via server-level access controls or a web application firewall rule until the patch can be applied.

IONIX Status

The IONIX research team is tracking ongoing exploitation attempts and recommends immediate patching. Potentially affected assets are outlined in this post.

References

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