{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-27447", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-02-19T17:25:31.100Z", "datePublished": "2026-04-03T21:11:59.734Z", "dateUpdated": "2026-04-06T18:50:21.909Z"}, "containers": {"cna": {"title": "OpenPrinting CUPS: Authorization bypass via case-insensitive group-member lookup", "problemTypes": [{"descriptions": [{"cweId": "CWE-863", "lang": "en", "description": "CWE-863: Incorrect Authorization", "type": "CWE"}]}], "metrics": [{"cvssV3_1": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 4.8, "baseSeverity": "MEDIUM", "confidentialityImpact": "HIGH", "integrityImpact": "LOW", "privilegesRequired": "HIGH", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:H/I:L/A:N", "version": "3.1"}}], "references": [{"name": "https://github.com/OpenPrinting/cups/security/advisories/GHSA-v987-m8hp-phj9", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/OpenPrinting/cups/security/advisories/GHSA-v987-m8hp-phj9"}, {"name": "https://github.com/OpenPrinting/cups/commit/88516bf6d9e34cef7a64a704b856b837f70cd220", "tags": ["x_refsource_MISC"], "url": "https://github.com/OpenPrinting/cups/commit/88516bf6d9e34cef7a64a704b856b837f70cd220"}], "affected": [{"vendor": "OpenPrinting", "product": "cups", "versions": [{"version": "<= 2.4.16", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-04-03T21:11:59.734Z"}, "descriptions": [{"lang": "en", "value": "OpenPrinting CUPS is an open source printing system for Linux and other Unix-like operating systems. In versions 2.4.16 and prior, CUPS daemon (cupsd) contains an authorization bypass vulnerability due to case-insensitive username comparison during authorization checks. The vulnerability allows an unprivileged user to gain unauthorized access to restricted operations by using a user with a username that differs only in case from an authorized user. At time of publication, there are no publicly available patches."}], "source": {"advisory": "GHSA-v987-m8hp-phj9", "discovery": "UNKNOWN"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-04-06T18:49:46.413933Z", "id": "CVE-2026-27447", "options": [{"Exploitation": "poc"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-04-06T18:50:21.909Z"}}]}}

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{"cveTags": [], "descriptions": [{"lang": "en", "value": "OpenPrinting CUPS is an open source printing system for Linux and other Unix-like operating systems. In versions 2.4.16 and prior, CUPS daemon (cupsd) contains an authorization bypass vulnerability due to case-insensitive username comparison during authorization checks. The vulnerability allows an unprivileged user to gain unauthorized access to restricted operations by using a user with a username that differs only in case from an authorized user. At time of publication, there are no publicly available patches."}], "id": "CVE-2026-27447", "lastModified": "2026-04-07T13:20:55.200", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 4.8, "baseSeverity": "MEDIUM", "confidentialityImpact": "HIGH", "integrityImpact": "LOW", "privilegesRequired": "HIGH", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:H/I:L/A:N", "version": "3.1"}, "exploitabilityScore": 0.5, "impactScore": 4.2, "source": "security-advisories@github.com", "type": "Secondary"}]}, "published": "2026-04-03T22:16:25.193", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/OpenPrinting/cups/commit/88516bf6d9e34cef7a64a704b856b837f70cd220"}, {"source": "security-advisories@github.com", "url": "https://github.com/OpenPrinting/cups/security/advisories/GHSA-v987-m8hp-phj9"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Awaiting Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-863"}], "source": "security-advisories@github.com", "type": "Primary"}]}

{"bugzilla": {"description": "cups: OpenPrinting CUPS: Authorization bypass via case-insensitive username comparison", "id": "2454949", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2454949"}, "csaw": false, "cvss3": {"cvss3_base_score": "6.4", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N", "status": "draft"}, "cwe": "CWE-178", "details": ["A flaw was found in OpenPrinting CUPS. This authorization bypass vulnerability allows an unprivileged user to gain unauthorized access to restricted operations. This can be exploited by using a username that differs only in case from an authorized user during authorization checks."], "mitigation": {"lang": "en:us", "value": "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."}, "name": "CVE-2026-27447", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "cups", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "cups", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "cups", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "cups", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "cups", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Fix deferred", "package_name": "rhcos", "product_name": "Red Hat OpenShift Container Platform 4"}], "public_date": "2026-04-03T21:11:59Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-27447\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-27447\nhttps://github.com/OpenPrinting/cups/commit/88516bf6d9e34cef7a64a704b856b837f70cd220\nhttps://github.com/OpenPrinting/cups/security/advisories/GHSA-v987-m8hp-phj9"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,2.4.16]"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "cups", "source": "cna", "vendor": "OpenPrinting"}, "product": "cups", "vendor": "openprinting"}], "analysis": {"en": {"generated_at": "2026-04-04T03:35:36.319147+00:00", "value": {"mitigation_remediation": ["Verify the CUPS version and ensure you are not running\u202f2.4.16 or older.", "Apply any available patches or updates from OpenPrinting as soon as they are released.", "If a patch is not yet available, consider disabling the CUPS service or restricting its network exposure with firewall rules.", "Limit local user accounts with printing privileges to trusted personnel and monitor for suspicious activity."], "summary": {"action": "Assess Impact", "impact": "Unauthorized privileged access to restricted CUPS operations"}, "threat_synthesis": {"affected_systems": "The issue affects the OpenPrinting CUPS printing system for Linux and other Unix\u2011like operating systems. Vulnerable versions are CUPS\u00a02.4.16 and all earlier releases. The product is maintained by the OpenPrinting project, and the vulnerability is reported in the CUPS daemon (cupsd).", "description_and_impact": "The vulnerability arises from a case\u2011insensitive comparison of usernames during CUPS authorization checks. An attacker who can create or use a user account whose name differs only in case from an authorized user can exercise privileged operations normally reserved for that authorized user. This bypass grants unauthorized access to restricted printing functions, potentially allowing the attacker to query protected information, modify print jobs, or otherwise abuse printing services. The weakness corresponds to improper comparison logic (CWE\u2011178) and insufficient privilege checks (CWE\u2011863).", "risk_and_exploitability": "The CVSS score of 4.8 indicates moderate severity. With no EPSS data and not listed in the KEV catalog, the exploitation likelihood is unclear, but the flaw can potentially be leveraged by users who have local or network access to the CUPS service. Based on the description, the attack likely requires an unprivileged user to interact with the CUPS daemon, which could be achieved through a local shell or through network requests if the service is exposed. Because the vulnerability permits an unauthorized privileged operation, successful exploitation would compromise confidentiality, integrity, or availability of the printing infrastructure. Until a patch is published, the risk remains elevated for systems exposing CUPS without proper access controls."}}}}, "created": "2026-04-06T21:22:33.800802+00:00", "updated": "2026-04-06T22:22:11.879337+00:00", "vendors": ["openprinting", "openprinting$PRODUCT$cups"]}