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Vulnerabilities

Vulnerability · CVE-2026-71573

[20260802] - Core - Improper CORS origin validation

Published Aug 17, 2026 · Joomla Joomla

Check if you run it

No confirmed exploitation is on record for CVE-2026-71573. EPSS is 0.34%. Act only if a listed version of Joomla Joomla is installed.

Gaps on this record

  • No version range is stored. A customer cannot check an installed version against this record.
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Unknown—
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.34%
Remediation
Not established
Affected products
Joomla Joomla

Project: Joomla! SubProject: CMS Impact: Moderate Severity: Moderate Probability: Moderate Versions: 4.0.0-5.4.7, 6.0.0-6.1.2 Exploit type: Improper CORS Origin Validation Reported Date: 2026-07-09 Fixed Date: 2026-08-18 CVE Number: CVE-2026-71573 Description An improper implementation prevented configured CORS origins from being properly validated in CORS requests. Affected Installs Joomla! CMS versions 4.0.0-5.4.7, 6.0.0-6.1.2 Solution Upgrade to version 5.4.8, 6.1.3 Contact The JSST at the Joomla! Security Centre . Reported By: Agamemnon Fakas, caveeroo

No affected version ranges are stored yet. Use the vendor advisory before you decide this record does not apply.

How to fix CVE-2026-71573

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-71573. EPSS is 0.34%. Act only if a listed version of Joomla Joomla is installed.

Which versions are affected?

Affected version ranges are not on this record. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 0.34%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Aug 17, 2026 · Joomla Security

    Detected

    Project: Joomla! SubProject: CMS Impact: Moderate Severity: Moderate Probability: Moderate Versions: 4.0.0-5.4.7, 6.0.0-6.1.2 Exploit type: Improper CORS Origin Validation Reported Date: 2026-07-09 Fixed Date: 2026-08-18 CVE Number: CVE-2026-71573 Description An improper implementation prevented configured CORS origins from being properly validated in CORS requests. Affected Installs Joomla! CMS v

Sources

  • CVE.orgVulnerability recordCVE-2026-71573

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-71573

    30-day exploitation probability 0.3%

    first.org
  • Joomla SecurityVendor advisoryCVE-2026-71573

    Project: Joomla! SubProject: CMS Impact: Moderate Severity: Moderate Probability: Moderate Versions: 4.0.0-5.4.7, 6.0.0-6.1.2 Exploit type: Improper CORS Origin Validation Reported Date: 2026-07-09 Fixed Date: 2026-08-18 CVE Number: CVE-2026-71573 Description An improper implemen

    developer.joomla.org

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.