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CVE-2026-57829 is an unauthenticated stored cross-site scripting vulnerability in the Helix Ultimate extension for Joomla. The issue affects Helix Ultimate versions 1.0 through 2.2.6. The flaw allows attacker-controlled script content to be stored by the application and later rendered in a victim’s browser within the Joomla administrative or application context when the affected content is viewed. No authentication is required to submit the malicious payload.
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1 valid exploit after Mallory filtered fakes, detection scripts, and README-only repos.
Repository contains a focused Joomla/Helix Ultimate exploit write-up plus two Python scripts: one detection-oriented and one active PoC. The core issue described is an unauthenticated web attack against Joomla's com_ajax endpoint for the Helix Ultimate plugin: index.php?option=com_ajax&plugin=helixultimate&format=json&task=saveMegaMenuSettings. Both scripts use requests.Session to POST attacker-controlled settings[customclass] and a menu item id to /index.php, then fetch the target homepage to verify whether the value is reflected in menu HTML. The detection script writes a benign marker and checks for unescaped reflection; the PoC writes a real XSS payload by default, supports custom payloads, auto-discovers a menu item id from item-N CSS classes, and includes a cleanup mode. The README documents the full exploit chain: unauthenticated menu-setting write via Response::saveMegaMenuSettings(), storage in menu params, and unescaped rendering by the Helix Ultimate mod_menu override, producing stored XSS for all visitors. It further documents a same-origin browser payload that, when executed in an administrator's browser session, can create a new Joomla Super User via backend endpoints, enabling account takeover and eventual RCE. Overall, this is a real exploit repository, not just a detector, with operational PoC code for the initial stored-XSS stage and documented follow-on privilege escalation steps.
8 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
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Cross-references every affected SKU, including bundled OEM variants.
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