CVE-2026-30452: Textpattern CMS 4.9.0 contains a Broken Access Control vulnerability in the article management system that all

Routine

MEDIUM 6.5DOWNGRADE

CVE-2026-30452 is a medium-severity flaw (CVSS 6.5) affecting textpattern. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Textpattern CMS 4.9.0 contains a Broken Access Control vulnerability in the article management system that allows authenticated users with low privileges to modify articles owned by users with higher privileges. By manipulating the article ID parameter during the duplicate-and-save workflow in textpattern/include/txp_article.php, an attacker can bypass authorization checks and overwrite content belonging to other users.

Why this priority

No elevated risk signals yet

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.2% (top 84%)
CISA exploited list	No
Weakness	CWE-284
Published	2026-04-21
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: textpattern

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-21 17:16 UTCPublished CVE record published
2026-06-17 10:32 UTCUpdated Record last modified

textpattern textpattern DOWNGRADE

Affected: 4.9.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 4.9.0

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 4.9.0 (Debian / Ubuntu)

apt-cache madison textpattern sudo apt install textpattern=<VERSION_BEFORE_4.9.0> sudo apt-mark hold textpattern

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list textpattern sudo dnf downgrade textpattern-<VERSION_BEFORE_4.9.0> sudo dnf versionlock add textpattern

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.

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-2026-30452?

textpattern: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2026-30452 being exploited?

CVE-2026-30452 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-2026-30452 affect?

CVE-2026-30452 affects textpattern. Severity is medium (CVSS 6.5). Textpattern CMS 4.9.0 contains a Broken Access Control vulnerability in the article management system that allows authenticated users with low privileges to modify articles owned by users with higher privileges. By manipulating the article

How urgent is CVE-2026-30452?

Priority 27/100. No elevated risk signals yet.

Software pages

PHP vulnerabilities

References

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