CVE-2016-20053: Redaxo CMS 5.2 contains a cross-site request forgery vulnerability that allows unauthenticated attackers to cr

This week

MEDIUM 5.3REMOTEDOWNGRADE

CVE-2016-20053 is a medium-severity flaw (CVSS 5.3) affecting redaxo. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Redaxo CMS 5.2 contains a cross-site request forgery vulnerability that allows unauthenticated attackers to create administrative user accounts by tricking authenticated administrators into visiting malicious pages. Attackers can craft HTML forms targeting the users endpoint with hidden fields containing admin credentials and account parameters to add new administrator accounts without user consent.

Why this priority

Public exploit reference
Remotely exploitable, no login, no user action

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

Risk facts

CVSS score	5.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.1% (top 96%)
CISA exploited list	No
Weakness	CWE-352
Published	2026-04-04
Last modified	2026-07-21

Publisher (CNA): VulnCheck · Vendor: redaxo

Last updated 2026-07-21 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-04 14:16 UTCPublished CVE record published
2026-07-21 07:10 UTCUpdated Record last modified

redaxo redaxo DOWNGRADE

Affected: 5.2

Fixed in: no fixed release known

Safe to downgrade to: a release before 5.2

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 5.2 (Debian / Ubuntu)

apt-cache madison redaxo sudo apt install redaxo=<VERSION_BEFORE_5.2> sudo apt-mark hold redaxo

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

dnf --showduplicates list redaxo sudo dnf downgrade redaxo-<VERSION_BEFORE_5.2> sudo dnf versionlock add redaxo

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-2016-20053?

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

Is CVE-2016-20053 being exploited?

CVE-2016-20053 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-2016-20053 affect?

CVE-2016-20053 affects redaxo. Severity is medium (CVSS 5.3). Redaxo CMS 5.2 contains a cross-site request forgery vulnerability that allows unauthenticated attackers to create administrative user accounts by tricking authenticated administrators into visiting malicious pages. Attackers can craft HTML

How urgent is CVE-2016-20053?

Priority 30/100. Public exploit reference; Remotely exploitable, no login, no user action

Related CVEs

CVE-2026-63002 MEDIUM 4.8 UPGRADE REDAXO is a PHP-based content management system
CVE-2026-63001 MEDIUM 4.8 UPGRADE REDAXO is a PHP-based content management system
CVE-2026-63000 MEDIUM 6.4 UPGRADE REDAXO is a PHP-based content management system
CVE-2026-62998 MEDIUM 4.3 UPGRADE REDAXO is a PHP-based content management system

References

← Back to latest CVEs