{ "document": { "category": "csaf_base", "csaf_version": "2.0", "distribution": { "tlp": { "label": "WHITE" } }, "lang": "en", "notes": [ { "category": "legal_disclaimer", "text": "The Netherlands Cyber Security Center (henceforth: NCSC-NL) maintains this portal to enhance access to its information and vulnerabilities. The use of this information is subject to the following terms and conditions:\n\nThe vulnerabilities disclosed in this portal are gathered by NCSC-NL from a variety of open sources, which the user can retrieve from other platforms. NCSC-NL makes every reasonable effort to ensure that the content of this portal is kept up to date, and that it is accurate and complete. Nevertheless, NCSC-NL cannot entirely rule out the possibility of errors, and therefore cannot give any warranty in respect of its completeness, accuracy or real-time keeping up-to-date. NCSC-NL does not control nor guarantee the accuracy, relevance, timeliness or completeness of information obtained from these external sources. The vulnerabilities disclosed in this portal are intended solely for the convenience of professional parties to take appropriate measures to manage the risks posed to the cybersecurity. No rights can be derived from the information provided therein.\n\nNCSC-NL and the Kingdom of the Netherlands assume no legal liability or responsibility for any damage resulting from either the use or inability of use of the vulnerabilities disclosed in this portal. This includes damage resulting from the inaccuracy of incompleteness of the information contained in it.\nThe information on this page is subject to Dutch law. All disputes related to or arising from the use of this portal regarding the disclosure of vulnerabilities will be submitted to the competent court in The Hague. This choice of means also applies to the court in summary proceedings." } ], "publisher": { "category": "coordinator", "contact_details": "cert@ncsc.nl", "name": "National Cyber Security Centre", "namespace": "https://www.ncsc.nl/" }, "title": "CVE-2026-4981", "tracking": { "current_release_date": "2026-03-28T12:29:05.459189Z", "generator": { "date": "2026-02-17T15:00:00Z", "engine": { "name": "V.E.L.M.A", "version": "1.7" } }, "id": "CVE-2026-4981", "initial_release_date": "2026-02-17T22:29:49.641198Z", "revision_history": [ { "date": "2026-02-17T22:29:49.641198Z", "number": "1", "summary": "NCSC Score created." }, { "date": "2026-03-28T12:28:59.791335Z", "number": "2", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| Products connected (2).| Product Identifiers created (1).| Product Remediations created (2).| References created (2).| CWES updated (1).| Vendor_assessment created." }, { "date": "2026-03-28T12:29:02.104304Z", "number": "3", "summary": "NCSC Score updated." } ], "status": "interim", "version": "3" } }, "product_tree": { "branches": [ { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:rpm/4", "product": { "name": "vers:rpm/4", "product_id": "CSAFPID-1441083", "product_identification_helper": { "cpe": "cpe:/a:redhat:advanced_cluster_security:4" } } } ], "category": "product_name", "name": "Red Hat Advanced Cluster Security 4" }, { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:rpm/unknown", "product": { "name": "vers:rpm/unknown", "product_id": "CSAFPID-1441085" } } ], "category": "product_name", "name": "rhacs-main-rhel8" } ], "category": "product_family", "name": "Red Hat Advanced Cluster Security 4" } ], "category": "vendor", "name": "Red Hat" } ] }, "vulnerabilities": [ { "cve": "CVE-2026-4981", "cwe": { "id": "CWE-601", "name": "URL Redirection to Untrusted Site ('Open Redirect')" }, "notes": [ { "category": "description", "text": "A flaw was found in Red Hat Advanced Cluster Security (ACS). An unauthenticated remote attacker can exploit a vulnerability in the login interface's OAuth callback endpoint by crafting a malicious URL. This URL, containing unvalidated `error` and `error_uri` parameters, allows the attacker to display arbitrary error messages, leading to content spoofing. Furthermore, the attacker can redirect victims to malicious domains, effectively performing an open redirect under the guise of the trusted application's user interface.\nThis Moderate impact vulnerability in Red Hat Advanced Cluster Security (ACS) allows an unauthenticated remote attacker to perform open redirect and content spoofing. By crafting a malicious URL with unvalidated parameters in the OAuth callback endpoint, an attacker can display arbitrary error messages and redirect users to malicious domains, appearing as the trusted application UI. This primarily affects user interaction with the login interface.", "title": "redhat - https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-4981.json" }, { "category": "other", "text": "4.3", "title": "NCSC Score" }, { "category": "other", "text": "There is product_remediation data available from source Redhat", "title": "NCSC Score top decreasing factors" }, { "category": "details", "text": "Severity: 2\n", "title": "Vendor assessment" } ], "product_status": { "known_affected": [ "CSAFPID-1441083", "CSAFPID-1441085" ] }, "references": [ { "category": "external", "summary": "Source - redhat", "url": "https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-4981.json" }, { "category": "external", "summary": "Reference - redhat", "url": "https://www.cve.org/CVERecord?id=CVE-2026-4981" }, { "category": "external", "summary": "Reference - redhat", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-4981" } ], "remediations": [ { "category": "mitigation", "details": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.", "product_ids": [ "CSAFPID-1441083", "CSAFPID-1441085" ] } ], "scores": [ { "cvss_v3": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N", "baseScore": 5.4, "baseSeverity": "MEDIUM" }, "products": [ "CSAFPID-1441083", "CSAFPID-1441085" ] } ], "title": "CVE-2026-4981" } ] }