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PatchSiren cyber security CVE debrief

CVE-2016-20053 Redaxo CVE debrief

CVE-2016-20053 is a cross-site request forgery vulnerability in Redaxo CMS 5.2. This vulnerability allows unauthenticated attackers to create administrative user accounts by tricking authenticated administrators into visiting malicious pages. The vulnerability exists in the users endpoint of Redaxo CMS 5.2. Attackers can craft HTML forms with hidden fields containing admin credentials and account parameters to add new administrator accounts without user consent. The vulnerability has a CVSS score of 6.9 and is classified as MEDIUM severity.

Vendor
Redaxo
Product
Redaxo CMS
CVSS
MEDIUM 6.9
CISA KEV
Not listed in stored evidence
Original CVE published
2026-04-04
Original CVE updated
2026-07-21
Advisory published
2026-04-04
Advisory updated
2026-07-21

Who should care

Administrators and users of Redaxo CMS 5.2 should be aware of this vulnerability and take steps to defend against it. This includes verifying and applying vendor patches or updates, implementing additional security measures such as input validation and output encoding, and monitoring for suspicious activity.

Technical summary

The vulnerability exists in the users endpoint of Redaxo CMS 5.2. Attackers can craft HTML forms with hidden fields containing admin credentials and account parameters to add new administrator accounts without user consent. The vulnerability allows unauthenticated attackers to create administrative user accounts by tricking authenticated administrators into visiting malicious pages. The vulnerability has a CVSS score of 6.9 and is classified as MEDIUM severity.

Defensive priority

Medium

Recommended defensive actions

  • Verify and apply vendor patches or updates
  • Implement additional security measures such as input validation and output encoding
  • Monitor for suspicious activity and implement incident response plans
  • Review compensating controls for exposed systems while remediation is scheduled and verified
  • Check relevant monitoring, detection, and logs for exposed assets that need extra review
  • Track exceptions, retest remediated assets, and close the item only after evidence is documented
  • Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE record was published on 2026-04-04T14:16:17.700Z and was last modified on 2026-07-21T07:10:00.117Z. The NVD entry is currently Analyzed. The vulnerability was reported by a security researcher and is related to cross-site request forgery in Redaxo CMS 5.2. The evidence is based on the CVE record and NVD entry.

Sources and references

Verified primary and authoritative sources

  • CVE-2016-20053 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2016-20053

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2016-20053 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2016-20053

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.