CVE-2026-30895Network attack vector

Cross-site scripting via unescaped readmore link output

Published May 26, 2026 · Updated May 26, 2026

Cross-site scripting in Joomla! CMS 4.0.0 through 5.4.5 and 6.0.0 through 6.1.0 allows attackers to execute script via readmore links. The com_content readmore-link renderer emits attacker-controlled link content into HTML without contextual output escaping. Attackers need high privileges to supply the content, and a visitor must render the affected link; script then runs in that visitor's browser context.

CVSS severity6.9
Medium
EPSS probability0.18%
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 5.4.5 and 6.0.0 through 6.1.0 allows attackers to execute script via readmore links. The com_content readmore-link renderer emits attacker-controlled link content into HTML without contextual output escaping. Attackers need high privileges to supply the content, and a visitor must render the affected link; script then runs in that visitor's browser context.

The record

CVE
CVE-2026-30895
Published
May 26, 2026
Updated
May 26, 2026
Vendor
Joomla! Project
Product
Joomla! CMS
Classifications
CWE-79, CAPEC-18, T1059.007
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. May 26, 2026CVE publishedPublication date reported by the CVE source.
  2. May 26, 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=4.0.0-5.4.5
  2. Affected versionversion=6.0.0-6.1.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Joomla! Project · Joomla! CMSversion=4.0.0-5.4.5; version=6.0.0-6.1.0

Published CVSS scores

6.9Joomla! ProjectCVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:H/VI:L/VA:L/SC:N/SI:N/SA:N
6.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

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')
CAPEC-18XSS Targeting Non-Script Elements
T1059.007JavaScript/JScript

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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