CVE-2026-48953: CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in Joomla! Project Joomla! CMS
Lack of escaping leads to an XSS vulnerability in the generic image output layout.
AI Analysis
Technical Summary
This vulnerability (CVE-2026-48953) in Joomla! CMS is due to improper escaping of input in the generic image output layout, resulting in a cross-site scripting (CWE-79) flaw. The vulnerability allows an attacker with high privileges and partial user interaction to inject malicious scripts, potentially impacting confidentiality and integrity. The CVSS 4.0 base score is 5.9, indicating medium severity. Affected versions are explicitly identified as 4.0.0 to 5.4.6 and 6.0.0 to 6.1.1. No vendor advisory or patch is currently available, and no known exploits have been reported.
Potential Impact
Successful exploitation of this vulnerability could allow an attacker with high privileges and some user interaction to execute arbitrary scripts in the context of the affected Joomla! CMS web pages. This could lead to partial compromise of confidentiality and integrity of the affected system. However, the impact is limited by the requirement for high privileges and user interaction.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, administrators should monitor Joomla! Project advisories for updates. Given the nature of the vulnerability, restricting user input and applying any available workarounds related to input escaping may help reduce risk.
CVE-2026-48953: CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in Joomla! Project Joomla! CMS
Description
Lack of escaping leads to an XSS vulnerability in the generic image output layout.
CVSS v4.0
Score 5.9medium
Affected software
pkg:composer/joomla/joomla-cmsRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CVE-2026-48953) in Joomla! CMS is due to improper escaping of input in the generic image output layout, resulting in a cross-site scripting (CWE-79) flaw. The vulnerability allows an attacker with high privileges and partial user interaction to inject malicious scripts, potentially impacting confidentiality and integrity. The CVSS 4.0 base score is 5.9, indicating medium severity. Affected versions are explicitly identified as 4.0.0 to 5.4.6 and 6.0.0 to 6.1.1. No vendor advisory or patch is currently available, and no known exploits have been reported.
Potential Impact
Successful exploitation of this vulnerability could allow an attacker with high privileges and some user interaction to execute arbitrary scripts in the context of the affected Joomla! CMS web pages. This could lead to partial compromise of confidentiality and integrity of the affected system. However, the impact is limited by the requirement for high privileges and user interaction.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, administrators should monitor Joomla! Project advisories for updates. Given the nature of the vulnerability, restricting user input and applying any available workarounds related to input escaping may help reduce risk.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- Joomla
- Date Reserved
- 2026-05-26T16:47:13.550Z
- Cvss Version
- 4.0
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a4d456fc9d9e3dbe3a44f20
Added to database: 07/07/2026, 18:29:03 UTC
Last enriched: 07/07/2026, 18:43:56 UTC
Last updated: 07/07/2026, 19:13:51 UTC
Views: 2
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