CVE-2026-25900Network attack vector

Authenticated XSS via unescaped feed module output

Published May 26, 2026 · Updated May 26, 2026

Cross-site scripting in Joomla! CMS feed modules 3.0.0 through 5.4.5 and 6.0.0 through 6.1.0 allows remote authenticated users to run scripts. Feed module output reaches generated pages without required escaping, but Joomla has not identified the affected templates or feed fields. Exploitation requires high privileges and passive interaction by another user, exposing that user’s browser session to attacker-controlled script.

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 feed modules 3.0.0 through 5.4.5 and 6.0.0 through 6.1.0 allows remote authenticated users to run scripts. Feed module output reaches generated pages without required escaping, but Joomla has not identified the affected templates or feed fields. Exploitation requires high privileges and passive interaction by another user, exposing that user’s browser session to attacker-controlled script.

The record

CVE
CVE-2026-25900
Published
May 26, 2026
Updated
May 26, 2026
Vendor
Joomla! Project
Product
Joomla! CMS
Classifications
CWE-79, CAPEC-18, T1203
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=3.0.0-5.4.5
  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=3.0.0-5.4.5; 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
T1203Exploitation for Client Execution

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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