{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-93955", "assignerOrgId": "1af790b2-7ee1-4545-860a-a788eba489b5", "state": "PUBLISHED", "assignerShortName": "VulDB", "dateReserved": "2026-09-19T08:51:16.505Z", "datePublished": "2026-09-19T22:15:09.092Z", "dateUpdated": "2026-09-19T22:15:09.092Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "1af790b2-7ee1-4545-860a-a788eba489b5", "shortName": "VulDB", "dateUpdated": "2026-09-19T22:15:09.092Z"}, "title": "grimmory-tools grimmory Download Endpoint KoboController.java streamFileToResponse authorization", "problemTypes": [{"descriptions": [{"type": "CWE", "cweId": "CWE-639", "lang": "en", "description": "Authorization Bypass"}]}, {"descriptions": [{"type": "CWE", "cweId": "CWE-285", "lang": "en", "description": "Improper Authorization"}]}], "affected": [{"vendor": "grimmory-tools", "product": "grimmory", "versions": [{"version": "3.3.0", "status": "affected"}, {"version": "3.3.1", "status": "affected"}, {"version": "3.3.2", "status": "affected"}, {"version": "3.3.3", "status": "affected"}, {"version": "3.4.0", "status": "affected"}, {"version": "3.4.1", "status": "affected"}], "cpes": ["cpe:2.3:a:grimmory-tools:grimmory:*:*:*:*:*:*:*:*"], "modules": ["Download Endpoint"]}], "descriptions": [{"lang": "en", "value": "A vulnerability was detected in grimmory-tools grimmory up to 3.3.3/3.4.1. Affected by this vulnerability is the function streamFileToResponse of the file backend/src/main/java/org/booklore/controller/KoboController.java of the component Download Endpoint. Performing a manipulation of the argument bookId results in authorization bypass. The attack may be initiated remotely. The exploit is now public and may be used. Issue #2431 is closed as completed, but its only comment states that the issue \u201chas already been reported elsewhere.\u201d No fixing commit or pull request is identified there."}], "metrics": [{"cvssV4_0": {"version": "4.0", "baseScore": 5.3, "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:P", "baseSeverity": "MEDIUM"}}, {"cvssV3_1": {"version": "3.1", "baseScore": 4.3, "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N/E:P/RL:X/RC:R", "baseSeverity": "MEDIUM"}}, {"cvssV3_0": {"version": "3.0", "baseScore": 4.3, "vectorString": "CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N/E:P/RL:X/RC:R", "baseSeverity": "MEDIUM"}}, {"cvssV2_0": {"version": "2.0", "baseScore": 4, "vectorString": "AV:N/AC:L/Au:S/C:P/I:N/A:N/E:POC/RL:ND/RC:C"}}], "timeline": [{"time": "2026-09-19T00:00:00.000Z", "lang": "en", "value": "Advisory disclosed"}, {"time": "2026-09-19T02:00:00.000Z", "lang": "en", "value": "VulDB entry created"}, {"time": "2026-09-19T10:56:27.000Z", "lang": "en", "value": "VulDB entry last update"}], "credits": [{"lang": "en", "value": "summmm (VulDB User)", "type": "reporter"}, {"lang": "en", "value": "VulDB CNA Team", "type": "coordinator"}], "references": [{"url": "https://vuldb.com/vuln/407914", "name": "VDB-407914 | grimmory-tools grimmory Download Endpoint KoboController.java streamFileToResponse authorization", "tags": ["vdb-entry", "technical-description"]}, {"url": "https://vuldb.com/vuln/407914/cti", "name": "VDB-407914 | CTI Indicators (IOB, IOC, IOA)", "tags": ["signature", "permissions-required"]}, {"url": "https://vuldb.com/cve/CVE-2026-93955", "name": "CVE-2026-93955 | CVE Analysis and Report", "tags": ["third-party-advisory"]}, {"url": "https://vuldb.com/submit/943921", "name": "Submit #943921 | grimmory-tools grimmory 3.3.3 Incorrect Access Control", "tags": ["third-party-advisory"]}, {"url": "https://github.com/grimmory-tools/grimmory/issues/2431", "tags": ["exploit", "issue-tracking"]}, {"url": "https://github.com/grimmory-tools/grimmory/issues/2431#issuecomment-5384402858", "tags": ["issue-tracking"]}, {"url": "https://github.com/grimmory-tools/grimmory/", "tags": ["product"]}], "x_generator": ["VulDB PVTS v202609"]}}}

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{"affected": [{"affectedData": [{"cpes": ["cpe:2.3:a:grimmory-tools:grimmory:*:*:*:*:*:*:*:*"], "modules": ["Download Endpoint"], "product": "grimmory", "vendor": "grimmory-tools", "versions": [{"status": "affected", "version": "3.3.0"}, {"status": "affected", "version": "3.3.1"}, {"status": "affected", "version": "3.3.2"}, {"status": "affected", "version": "3.3.3"}, {"status": "affected", "version": "3.4.0"}, {"status": "affected", "version": "3.4.1"}]}], "source": "cna@vuldb.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "A vulnerability was detected in grimmory-tools grimmory up to 3.3.3/3.4.1. Affected by this vulnerability is the function streamFileToResponse of the file backend/src/main/java/org/booklore/controller/KoboController.java of the component Download Endpoint. Performing a manipulation of the argument bookId results in authorization bypass. The attack may be initiated remotely. The exploit is now public and may be used. Issue #2431 is closed as completed, but its only comment states that the issue \u201chas already been reported elsewhere.\u201d No fixing commit or pull request is identified there."}], "id": "CVE-2026-93955", "lastModified": "2026-09-19T23:17:09.653", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "MEDIUM", "cvssData": {"accessComplexity": "LOW", "accessVector": "NETWORK", "authentication": "SINGLE", "availabilityImpact": "NONE", "baseScore": 4.0, "confidentialityImpact": "PARTIAL", "integrityImpact": "NONE", "vectorString": "AV:N/AC:L/Au:S/C:P/I:N/A:N", "version": "2.0"}, "exploitabilityScore": 8.0, "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": 4.3, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 1.4, "source": "cna@vuldb.com", "type": "Primary"}], "cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "NONE", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 2.1, "baseSeverity": "LOW", "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": "LOW", "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:L/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"}]}, "published": "2026-09-19T23:17:09.077", "references": [{"source": "cna@vuldb.com", "url": "https://github.com/grimmory-tools/grimmory/"}, {"source": "cna@vuldb.com", "url": "https://github.com/grimmory-tools/grimmory/issues/2431"}, {"source": "cna@vuldb.com", "url": "https://github.com/grimmory-tools/grimmory/issues/2431#issuecomment-5384402858"}, {"source": "cna@vuldb.com", "url": "https://vuldb.com/cve/CVE-2026-93955"}, {"source": "cna@vuldb.com", "url": "https://vuldb.com/submit/943921"}, {"source": "cna@vuldb.com", "url": "https://vuldb.com/vuln/407914"}, {"source": "cna@vuldb.com", "url": "https://vuldb.com/vuln/407914/cti"}], "sourceIdentifier": "cna@vuldb.com", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-285"}, {"lang": "en", "value": "CWE-639"}], "source": "cna@vuldb.com", "type": "Primary"}]}

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