CVE-2026-30894 MEDIUM

CVE-2026-30894: Joomla! Core - [20260503] - XSS in com_contenthistory

Vendor Joomla! Project
Product Joomla! CMS
Weakness CWE-79 · XSS
Published May 26, 2026
Last update June 5, 2026
View on NVD All CVEs

CVSS base score

6.9/10
Attack vector Network
Attack complexity Low
Privileges required High
User interaction —
Confidentiality —
Integrity —

CVSS vector

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

What the vulnerability does

01Description

Lack of output escaping leads to a XSS vector in the content history component.

Explanation of Vulnerability in Simple Terms

02Summary

Joomla CMS versions 3.0.0 through 5.4.5 contain a cross-site scripting (XSS) vulnerability that allows authenticated users with high privileges to inject malicious scripts. An attacker with administrative access and user interaction (such as visiting a crafted link) can execute JavaScript in other users' browsers, potentially compromising site security or stealing session data.

What an attacker can do

03Attacker Capabilities

Inject and execute malicious JavaScript in other users' browsers to steal data or perform actions on their behalf.

Potential impact on your site

04Site Impact

Compromised admin accounts could allow attackers to inject malicious scripts affecting other users and site integrity.

Conditions required to exploit

05Prerequisites

Attacker must have high-level administrative privileges and the victim must visit a crafted link or page.

Key dates

06Disclosure timeline

May 26, 2026 CVE published
June 5, 2026 Record updated

Related vulnerabilities

08Related CVE

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