CVE-2026-21623 | BDVDB-2026-311014 Detail

Stackideas.comEasyDiscuss extension for Joomla

Description#

Lack of input filterung leads to a persistent XSS vulnerability in the forum post handling of the Easy Discuss component for Joomla.

CAPEC-18 XSS Targeting Non-Script Elements

CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

No public exploit known

9.4 Critical

less than 1%, Very Low

Estimated chance of exploitation in the next 30 days. EPSS percentile: 9.5.

Not listed in the CISA Known Exploited Vulnerabilities catalog.

Cross-Site Scripting

No specific action is recorded in the source data. Check the references for vendor guidance.

9.4 Critical

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H

Metric breakdown
Attack Vector	Network
Attack Complexity	Low
Attack Requirements	None
Privileges Required	Low
User Interaction	Passive
Vulnerable System Confidentiality	High
Vulnerable System Integrity	High
Vulnerable System Availability	High
Subsequent System Confidentiality	High
Subsequent System Integrity	High
Subsequent System Availability	High

Not available

Not available

Not available

Source: CVE List v5 (record); CISA KEV (kev, action); FIRST EPSS (epss).