---
cve: "CVE-2026-21632"
severity: "MEDIUM"
cvss: 5.9
epss: "0.2%"
vendor: "Joomla! Project"
kev: false
exploited: false
published: "2026-04-01 09:03:11"
tags: [cve, security, medium]
source: tsecurity.de CVE-Dossier
exported: "2026-10-28T20:58:44+01:00"
---

# CVE-2026-21632

> 5.9 MEDIUM

## Beschreibung

Lack of output escaping for article titles leads to XSS vectors in various locations.

## CNA-Record (Kanon, cvelistV5)

- CNA: **Joomla**
- State: PUBLISHED
- Stand: 2026-04-02 05:09:54
- CNA-CVSS: **5.9** (`CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N/E:U`)

## CISA-Anreicherung (vulnrichment/ADP)

- CISA-SSVC (Coordinator, v2.0.3):
  - Exploitation: **none**
  - Automatable: **no**
  - Technical Impact: **total**

## CVSS-Vektor

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

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Hoch | good |

## Schwachstellen-Klasse

- **CWE-79** — Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
  The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.

## Angriffsmuster (CAPEC)

- [CAPEC-63 — Cross-Site Scripting (XSS)](https://capec.mitre.org/data/definitions/63.html) _(Severity: Very High)_
- [CAPEC-85 — AJAX Footprinting](https://capec.mitre.org/data/definitions/85.html) _(Severity: Low)_
- [CAPEC-209 — XSS Using MIME Type Mismatch](https://capec.mitre.org/data/definitions/209.html) _(Severity: Medium)_
- [CAPEC-588 — DOM-Based XSS](https://capec.mitre.org/data/definitions/588.html) _(Severity: Very High)_
- [CAPEC-591 — Reflected XSS](https://capec.mitre.org/data/definitions/591.html) _(Severity: Very High)_
- [CAPEC-592 — Stored XSS](https://capec.mitre.org/data/definitions/592.html) _(Severity: Very High)_

## Patch verfügbar (OSV)

- 47b48aeceae211ae8016cf1da2b821a0d0467f55 (Commit)
- e7d45e19c77cc0fa3b9a70af48b05bb937a7f011 (Commit)

## BSI-Hinweise (deutsch)

- [Joomla CMS: Mehrere Schwachstellen](https://wid.cert-bund.de/portal/wid/sicherheitshinweis/WID-SEC-W-2026-0936) — _BSI-Einstufung: hoch_
  Ein Angreifer kann mehrere Schwachstellen in Joomla CMS ausnutzen, um Sicherheitsvorkehrungen zu umgehen, SQL-Injection-Angriffe durchzuführen, Daten zu manipulieren oder Cross-Site-Scripting-Angriffe auszuführen.

## Referenzen

- <https://developer.joomla.org/security-centre/1030-20260304-core-xss-vectors-in-various-article-title-outputs.html>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/sicherheitsluecken/cve-2026-21632/) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI WID (CSAF)_