CVE-2026-90917Network attack vectorHinoki check available

Restricted content disclosure via tagged-item ACL bypass

Published Sep 29, 2026 · Updated Sep 29, 2026

Incorrect access control in Joomla! CMS 4.0.0 through 5.4.8 and 6.0.0 through 6.1.3 allows remote attackers to read restricted tagged items. Tagged-item outputs fail to enforce the access restrictions of an item's category before presenting its content. The item must be tagged and belong to a category inaccessible to the requester; the reported consequence is disclosure, not content modification.

CVSS severity6.9
Medium
EPSS probability0.20%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Incorrect access control in Joomla! CMS 4.0.0 through 5.4.8 and 6.0.0 through 6.1.3 allows remote attackers to read restricted tagged items. Tagged-item outputs fail to enforce the access restrictions of an item's category before presenting its content. The item must be tagged and belong to a category inaccessible to the requester; the reported consequence is disclosure, not content modification.

The record

CVE
CVE-2026-90917
Published
Sep 29, 2026
Updated
Sep 29, 2026
Vendor
Joomla! Project
Product
Joomla! CMS
Classifications
CWE-284
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 29, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 29, 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=4.0.0-5.4.8
  2. Affected versionversion=6.0.0-6.1.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Joomla! Project · Joomla! CMSversion=4.0.0-5.4.8; version=6.0.0-6.1.3

Published CVSS scores

6.9Joomla! Project CNACVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA: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.

Activity data is delayed. The latest report is Sep 28, 2026.

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

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-284Improper Access Control

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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