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Vulnerability record · CVE-2026-21623 · published 16 January 2026

CVE-2026-21623: Stackideas easydiscuss cross-site scripting vulnerability

Stackideas · Easydiscuss

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

9.4 CVSS 4.0 Critical EPSS 0.20% · top 91.2% CWE-79 · Cross-site scripting
9.4CVSS 4.0 base score
0.20%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
1References
17 Jun 2026Last modified by NVD

Description

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

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://stackideas.com/easydiscuss Product

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.4CVE-2026-21624Stackideas easydiscuss cross-site scripting vulnerabilityLack of input filterung leads to a persistent XSS vulnerability in the user avatar text handling of the Easy Discuss component for Joomla.EPSS 0.20%9.2CVE-2026-21626Stackideas easydiscuss information exposure vulnerabilityAccess control settings for forum post custom fields are not applied to the JSON output type, leading to an ACL violation vector an information discl…EPSS 0.39%7.5CVE-2023-51810Stackideas easydiscuss sql injection vulnerabilitySQL injection vulnerability in StackIdeas EasyDiscuss v.5.0.5 and fixed in v.5.0.10 allows a remote attacker to obtain sensitive information via a cr…EPSS 1.1%5.4CVE-2018-5263Stackideas easydiscuss cross-site scripting vulnerabilityThe StackIdeas EasyDiscuss (aka com_easydiscuss) extension before 4.0.21 for Joomla! allows XSS.EPSS 1.6%4.8CVE-2026-21625Stackideas easydiscuss unrestricted file upload vulnerabilityUser provided uploads to the Easy Discuss component for Joomla aren't properly validated. Uploads are purely checked by file extensions, no mime type…EPSS 0.39%6.1CVE-2026-42897Microsoft Exchange Server XSS enables spoofingMicrosoft Exchange Server and Exchange Server Subscription Edition fail to neutralize input during web page generation, a cross-site scripting flaw (…KEVEPSS 0.52%analysed6.1CVE-2025-48700Zimbra Classic UI stored XSS via crafted email HTMLZimbra Collaboration Suite Classic UI fails to properly sanitize HTML content in email messages, allowing crafted tag structures and attribute values…KEVEPSS 1.7%analysed6.1CVE-2025-66376Zimbra Collaboration Classic UI stored XSS via CSS @import in emailZimbra Collaboration Suite 10 before 10.0.18 and 10.1 before 10.1.13 allows stored cross-site scripting in the Classic UI through CSS @import directi…KEVEPSS 20%analysed

Source: NIST National Vulnerability Database (record CVE-2026-21623), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.