CVE-2026-5484

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{"affected": [{"affectedData": [{"cpes": ["cpe:2.3:a:bookstackapp:bookstack:*:*:*:*:*:*:*:*"], "modules": ["Chapter Export Handler"], "product": "BookStack", "vendor": "BookStackApp", "versions": [{"status": "affected", "version": "26.03"}, {"status": "unaffected", "version": "26.03.1"}]}], "source": "cna@vuldb.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "A weakness has been identified in BookStackApp BookStack up to 26.03. Affected is the function chapterToMarkdown of the file app/Exports/ExportFormatter.php of the component Chapter Export Handler. Executing a manipulation of the argument pages can lead to improper access controls. It is possible to launch the attack remotely. The exploit has been made available to the public and could be used for attacks. Upgrading to version 26.03.1 is able to address this issue. This patch is called 8a59895ba063040cc8dafd82e94024c406df3d04. It is advisable to upgrade the affected component. The vendor was contacted early, responded in a very professional manner and quickly released a fixed version of the affected product."}, {"lang": "es", "value": "Se ha identificado una debilidad en BookStackApp BookStack hasta la versi\u00f3n 26.03. Afecta a la funci\u00f3n chapterToMarkdown del archivo app/Exports/ExportFormatter.php del componente Gestor de Exportaci\u00f3n de Cap\u00edtulos. La ejecuci\u00f3n de una manipulaci\u00f3n del argumento pages puede llevar a controles de acceso inadecuados. Es posible lanzar el ataque de forma remota. El exploit se ha puesto a disposici\u00f3n del p\u00fablico y podr\u00eda utilizarse para ataques. La actualizaci\u00f3n a la versi\u00f3n 26.03.1 puede solucionar este problema. Este parche se denomina 8a59895ba063040cc8dafd82e94024c406df3d04. Es aconsejable actualizar el componente afectado. Se contact\u00f3 al proveedor con antelaci\u00f3n, respondi\u00f3 de manera muy profesional y lanz\u00f3 r\u00e1pidamente una versi\u00f3n corregida del producto afectado."}], "id": "CVE-2026-5484", "lastModified": "2026-07-20T20:10:00.110", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "MEDIUM", "cvssData": {"accessComplexity": "LOW", "accessVector": "NETWORK", "authentication": "NONE", "availabilityImpact": "NONE", "baseScore": 5.0, "confidentialityImpact": "PARTIAL", "integrityImpact": "NONE", "vectorString": "AV:N/AC:L/Au:N/C:P/I:N/A:N", "version": "2.0"}, "exploitabilityScore": 10.0, "impactScore": 2.9, "obtainAllPrivilege": false, "obtainOtherPrivilege": false, "obtainUserPrivilege": false, "source": "cna@vuldb.com", "type": "Secondary", "userInteractionRequired": false}], "cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 5.3, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 1.4, "source": "cna@vuldb.com", "type": "Secondary"}], "cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "NONE", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "PROOF_OF_CONCEPT", "integrityRequirement": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "privilegesRequired": "NONE", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:P/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", "version": "4.0", "vulnAvailabilityImpact": "NONE", "vulnConfidentialityImpact": "LOW", "vulnIntegrityImpact": "NONE", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "cna@vuldb.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-5484", "options": [{"exploitation": "poc"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-04-08T18:52:37.756630Z", "version": "2.0.3"}}]}, "published": "2026-04-03T20:16:05.347", "references": [{"source": "cna@vuldb.com", "url": "https://github.com/BookStackApp/BookStack/"}, {"source": "cna@vuldb.com", "url": "https://github.com/BookStackApp/BookStack/commit/8a59895ba063040cc8dafd82e94024c406df3d04"}, {"source": "cna@vuldb.com", "url": "https://github.com/BookStackApp/BookStack/releases/tag/v26.03.1"}, {"source": "cna@vuldb.com", "url": "https://github.com/Ghufran2/CVE-Bookstack/blob/main/Permission%20Bypass%20in%20Markdown%20Chapter%20Export"}, {"source": "cna@vuldb.com", "url": "https://vuldb.com/submit/781762"}, {"source": "cna@vuldb.com", "url": "https://vuldb.com/vuln/355091"}, {"source": "cna@vuldb.com", "url": "https://vuldb.com/vuln/355091/cti"}, {"source": "cna@vuldb.com", "url": "https://www.bookstackapp.com/blog/bookstack-release-v26-03-1/"}], "sourceIdentifier": "cna@vuldb.com", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-266"}, {"lang": "en", "value": "CWE-284"}], "source": "cna@vuldb.com", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "26.03"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "26.03.1"}}], "enrichment": {"confidence": 100.0, "confidence_source": "inferred", "scores": [{"score": 100.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "BookStack", "source": "cna", "vendor": "BookStackApp"}, "product": "bookstack", "vendor": "bookstackapp"}], "analysis": {"en": {"generated_at": "2026-04-03T22:35:29.708105+00:00", "value": {"mitigation_remediation": ["Upgrade BookStack to version 26.03.1 or later to remove the export access control flaw."], "summary": {"action": "Immediate Patch", "impact": "Access Control Bypass"}, "threat_synthesis": {"affected_systems": "Affected systems include all installations of BookStackApp BookStack up to and including version 26.03. The vulnerability is present in the ExportFormatter.php component. Users running earlier releases have no known mitigation; upgrading to 26.03.1 or later resolves the issue.", "description_and_impact": "A weakness has been identified in BookStackApp BookStack, located in the function chapterToMarkdown of the Chapter Export Handler. The flaw allows manipulation of the pages argument, resulting in improper access controls. An attacker can exploit this vulnerability by remotely triggering the export process to gain unauthorized access to chapter data.", "risk_and_exploitability": "The CVSS score of 6.9 indicates a moderate severity. EPSS data is unavailable, but the public exploit demonstrates that the vulnerability can be used remotely. It is not currently listed in the CISA KEV catalog. As the attack vector is remote and requires only manipulating a public\u2011facing endpoint, the risk to systems that expose the export functionality is significant for organizations that host uncensored or private content."}}}}, "created": "2026-04-06T21:23:02.644510+00:00", "updated": "2026-04-07T07:16:44.948042+00:00", "vendors": ["bookstackapp", "bookstackapp$PRODUCT$bookstack"]}