CVE-2026-48952Network attack vector

Administrator-session script execution via unescaped update metadata

Published Jul 7, 2026 · Updated Jul 7, 2026

Cross-site scripting in Joomla! CMS 4.0.0 through 5.4.6 and 6.0.0 through 6.1.1 allows remote authenticated users to run script via update metadata. The com_installer update-list template outputs fields obtained from extension update metadata without HTML escaping, allowing markup to enter the administrator page. Exploitation requires a privileged user to load an update list containing attacker-controlled metadata, placing the resulting script in that administrator session.

CVSS severity6.1
Medium
EPSS probability0.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cross-site scripting in Joomla! CMS 4.0.0 through 5.4.6 and 6.0.0 through 6.1.1 allows remote authenticated users to run script via update metadata. The com_installer update-list template outputs fields obtained from extension update metadata without HTML escaping, allowing markup to enter the administrator page. Exploitation requires a privileged user to load an update list containing attacker-controlled metadata, placing the resulting script in that administrator session.

The record

CVE
CVE-2026-48952
Published
Jul 7, 2026
Updated
Jul 7, 2026
Vendor
Joomla! Project
Product
Joomla! CMS
Classifications
CWE-79, T1203
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Jul 7, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 7, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=4.0.0-5.4.6
  2. Affected versionversion=6.0.0-6.1.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Joomla! Project · Joomla! CMSversion=4.0.0-5.4.6; version=6.0.0-6.1.1

Published CVSS scores

6.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
5.9Joomla! ProjectCVSS: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

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1203Exploitation for Client Execution

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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