CVE-2026-71573

Joomla! Core - [20260802] - Improper CORS origin validation in Joomla 4.0.0-5.4.7, 6.0.0-6.1.2 - An improper implementation prevented configured CORS origins from being properly validated in CORS requests.

CVSS v3 8.3 HIGH

8.3^/10

CVSS v3 : HIGH

Vector :

Exploitability : 3.9 / Impact : 3.7

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact LOW

Integrity Impact LOW

Availability Impact LOW

Scope CHANGED

References

Link	Resource
https://developer.joomla.org/security-centre/20260802-core-improper-cors-origin-validation.html	Vendor Advisory Broken Link
https://www.joomla.org/	Product

Configurations

Configuration 1 (hide)

OR	cpe:2.3:a:joomla:joomla\!::::::::
	cpe:2.3:a:joomla:joomla\!::::::::

History

No history.

Information

Published : 2026-08-18 17:17

Updated : 2026-09-03 15:04

NVD link : CVE-2026-71573

Mitre link : CVE-2026-71573

CVE.ORG link : CVE-2026-71573

JSON object : View

Products Affected

joomla

joomla\!

CWE

CWE-93

Improper Neutralization of CRLF Sequences ('CRLF Injection')

{"id": "CVE-2026-71573", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-71573", "role": "CISA Coordinator", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "version": "2.0.3", "timestamp": "2026-08-18T19:02:58.689211Z"}}], "cvssMetricV31": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "CHANGED", "version": "3.1", "baseScore": 8.3, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:L", "integrityImpact": "LOW", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "LOW", "privilegesRequired": "NONE", "confidentialityImpact": "LOW"}, "impactScore": 3.7, "exploitabilityScore": 3.9}], "cvssMetricV40": [{"type": "Secondary", "source": "security@joomla.org", "cvssData": {"Safety": "NOT_DEFINED", "version": "4.0", "Recovery": "NOT_DEFINED", "baseScore": 6.9, "Automatable": "NOT_DEFINED", "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:L/SI:L/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "exploitMaturity": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED", "userInteraction": "NONE", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "subIntegrityImpact": "LOW", "vulnIntegrityImpact": "NONE", "integrityRequirement": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "subAvailabilityImpact": "LOW", "vulnAvailabilityImpact": "NONE", "availabilityRequirement": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "subConfidentialityImpact": "LOW", "vulnConfidentialityImpact": "NONE", "confidentialityRequirement": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED"}}]}, "affected": [{"source": "security@joomla.org", "affectedData": [{"vendor": "Joomla! Project", "product": "Joomla! CMS", "versions": [{"status": "affected", "version": "4.0.0-5.4.6"}, {"status": "affected", "version": "6.0.0-6.1.2"}], "defaultStatus": "unaffected"}]}], "published": "2026-08-18T17:17:02.243", "references": [{"url": "https://developer.joomla.org/security-centre/20260802-core-improper-cors-origin-validation.html", "tags": ["Vendor Advisory", "Broken Link"], "source": "security@joomla.org"}, {"url": "https://www.joomla.org/", "tags": ["Product"], "source": "security@joomla.org"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Secondary", "source": "security@joomla.org", "description": [{"lang": "en", "value": "CWE-93"}]}], "descriptions": [{"lang": "en", "value": "Joomla! Core - [20260802] - Improper CORS origin validation in Joomla 4.0.0-5.4.7, 6.0.0-6.1.2 - An improper implementation prevented configured CORS origins from being properly validated in CORS requests."}], "lastModified": "2026-09-03T15:04:22.527", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:joomla:joomla\\!:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "03C3BB6E-737B-402D-8374-AD70BD5DA5DF", "versionEndExcluding": "5.4.8", "versionStartIncluding": "4.0.0"}, {"criteria": "cpe:2.3:a:joomla:joomla\\!:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "B8A0255D-2FD3-45CD-9C69-CE60C3956B95", "versionEndExcluding": "6.1.3", "versionStartIncluding": "6.0.0"}], "operator": "OR"}]}], "sourceIdentifier": "security@joomla.org"}