CVE-2026-64793 Overview
CVE-2026-64793 is an access control weakness [CWE-284] affecting Regular Labs content tag extensions. Content tags in the affected component accept ignore flags and property overrides that bypass publication state and access-level restrictions. A content author can craft a tag that renders restricted or unpublished articles or modules to visitors who lack the required permissions.
The flaw sits in the tag parser's handling of override parameters. Instead of enforcing the site's access control rules, the parser honors author-supplied flags that force inclusion of otherwise hidden content. This turns a content authoring privilege into an unauthorized content disclosure vector.
Critical Impact
Authors can leak unpublished or access-restricted articles and modules to unauthorized site visitors through tag flag manipulation.
Affected Products
- Regular Labs content tag extensions (see Regular Labs Security Overview)
- Joomla sites deploying the affected Regular Labs tag processors
- Environments where non-administrator authors can create or edit content containing tags
Discovery Timeline
- 2026-07-22 - CVE-2026-64793 published to the National Vulnerability Database
- 2026-07-22 - Last updated in NVD database
Technical Details for CVE-2026-64793
Vulnerability Analysis
The vulnerability is an improper access control issue in tag processing logic. Regular Labs tags accept parameters that alter how the extension resolves and renders referenced articles or modules. Among these parameters are ignore flags and property overrides that instruct the parser to skip enforcement of publication state, access level, or category-based restrictions.
Content authors typically have permission to embed tags in articles. The parser evaluates those tags at render time with the privileges required to fetch any referenced content. When authors supply ignore flags, the parser fetches restricted items and includes them in the rendered output delivered to any site visitor, including guests.
The issue is a business-logic access control failure rather than a memory-safety or injection defect. No authentication bypass or code execution is required, only the ability to author content that includes a maliciously configured tag.
Root Cause
The parser trusts tag-level flags to override access enforcement. Access checks are treated as optional filters controlled by the tag input instead of mandatory server-side authorization performed against the requesting visitor's session.
Attack Vector
An author account crafts an article or module that contains a Regular Labs tag with override parameters referencing a restricted or unpublished item. When any visitor loads the page containing the tag, the server renders the referenced content without checking whether the visitor holds the required access level. The exploitation requires authoring privileges, not administrative access.
No verified proof-of-concept code is published. Refer to the Regular Labs Security Overview for vendor guidance on affected parameters and safe tag usage.
Detection Methods for CVE-2026-64793
Indicators of Compromise
- Rendered pages containing article or module content whose database record is marked unpublished or restricted
- Tags in stored content referencing item IDs that the authoring user cannot normally view
- Web server access logs showing anonymous or low-privilege sessions retrieving pages that display restricted material
Detection Strategies
- Audit content records for Regular Labs tag syntax that includes ignore, override, or access-bypass parameters
- Compare rendered HTML output for guest sessions against the published state of referenced articles and modules
- Review author activity logs for edits that introduce tags referencing high-privilege or unpublished item IDs
Monitoring Recommendations
- Alert on new content submissions containing tag parameters that disable access filtering
- Track authorship of tags that reference item IDs outside the author's normal category scope
- Log server-rendered responses that include content flagged as unpublished at the database layer
How to Mitigate CVE-2026-64793
Immediate Actions Required
- Consult the Regular Labs Security Overview for the fixed release and apply it across all Joomla sites using the affected extensions
- Inventory stored content for Regular Labs tags containing ignore flags or property overrides and remove unauthorized instances
- Restrict authoring privileges to trusted users until the patched version is deployed
Patch Information
The vendor advisory is published by Regular Labs. Refer to the Regular Labs Security Overview for the specific fixed version, patch notes, and remediation instructions for each affected extension.
Workarounds
- Temporarily disable the affected Regular Labs tag extensions on production sites until patching is complete
- Enforce content review workflows so an editor validates any tag with override parameters before publication
- Reduce the number of user groups with author-level permissions to limit who can introduce vulnerable tags
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
