CVE-2026-100751 regularlabs.com CVE debrief

Who should care

Defenders of Joomla installations using Tabs & Accordions (Pro) 2.3.0 - 3.1.0 should assess exposure and prioritize remediation. This includes operators, platform administrators, vulnerability management teams, and security teams who need to verify affected versions and configurations.

Why it matters

CVE-2026-100751 is a high-severity vulnerability in Joomla Extension - regularlabs.com - Privileged stored XSS via data-rlta-url attributes in Tabs & Accordions (Pro) 2.3.0 - 3.1.0. Defenders should assess exposure, prioritize remediation, and verify affected versions.

• Defenders must assess exposure of Joomla installations using Tabs & Accordions (Pro) 2.3.0 - 3.1.0
• Remediation of vulnerable versions is required to prevent JavaScript execution
• Verification of affected versions and configurations is necessary

Technical summary

The vulnerability allows for JavaScript execution when a user activates an item in Joomla Extension - regularlabs.com - Privileged stored XSS via data-rlta-url attributes in Tabs & Accordions (Pro) 2.3.0 - 3.1.0. This occurs because affected versions do not reject browser URL schemes which execute JavaScript. Joomla sees ordinary plugin syntax while filtering the authored article; Tabs & Accordions creates the executable browser behavior later while rendering the article. Defenders should assess exposure and prioritize remediation.

Defensive priority

Defenders should prioritize remediation and verify affected versions.

Recommended defensive actions

• Assess exposure of Joomla installations using Tabs & Accordions (Pro) 2.3.0 - 3.1.0
• Prioritize remediation of vulnerable versions
• Verify affected versions and configurations
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE record and NVD vulnerability detail page provide information on the vulnerability. Defenders should verify affected versions and configurations. The vulnerability allows for JavaScript execution when a user activates an item in Joomla Extension - regularlabs.com - Privileged stored XSS via data-rlta-url attributes in Tabs & Accordions (Pro) 2.3.0 - 3.1.0. Evidence is limited to public sources and may not be comprehensive.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.