CVE-2026-71574: Joomla! Core - [20260803] - Inconsistent ACL checks for mutating webservice endpoints in Joomla 4.0.0-5.4.7, 6

Routine

MEDIUM 6.5UPGRADE

CVE-2026-71574 is a medium-severity flaw (CVSS 6.5) affecting joomla\!. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Joomla! Core - [20260803] - Inconsistent ACL checks for mutating webservice endpoints in Joomla 4.0.0-5.4.7, 6.0.0-6.1.2 - An improper access check allows unauthorized users to perform mutation actions in webservice endpoints, where the same mutation was restricted in the backend UI.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.3% (top 73%)
CISA exploited list	No
Weakness	CWE-284
Published	2026-08-18
Last modified	2026-10-22

Publisher (CNA): Joomla! Project · Vendor: joomla

Last updated 2026-10-22 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-08-18Published CVE record published
2026-10-22 22:10 UTCUpdated Record last modified

joomla joomla\! UPGRADE

Affected: >= 4.0.0 and < 5.4.8 · >= 6.0.0 and < 6.1.3

Fixed in: 5.4.8, 6.1.3

Safe to downgrade to: a release before 4.0.0

1. Check installed version

apt-cache policy joomla || rpm -q joomla || joomla --version

2. UPGRADE to 5.4.8 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade joomla

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade joomla

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 4.0.0 (Debian / Ubuntu)

apt-cache madison joomla sudo apt install joomla=<VERSION_BEFORE_4.0.0> sudo apt-mark hold joomla

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list joomla sudo dnf downgrade joomla-<VERSION_BEFORE_4.0.0> sudo dnf versionlock add joomla

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Advisories and coverage

Official advisories

Joomla Security Centre: [20260803] - Core - Inconsistent ACL checks for mutating webservice endpoints 2026-08-17

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-71574?

joomla\!: upgrade to 5.4.8, 6.1.3. Exact commands for each OS are on this page.

Is CVE-2026-71574 being exploited?

CVE-2026-71574 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-71574 affect?

CVE-2026-71574 affects joomla\!. Severity is medium (CVSS 6.5). Joomla! Core - [20260803] - Inconsistent ACL checks for mutating webservice endpoints in Joomla 4.0.0-5.4.7, 6.0.0-6.1.2 - An improper access check allows unauthorized users to perform mutation actions in webservice endpoints, where the sam

How urgent is CVE-2026-71574?

Priority 29/100. No elevated risk signals yet.

Software pages

Joomla vulnerabilities

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References

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