CVE-2021-3906

Unrestricted Upload of File with Dangerous Type in bookstackapp/bookstack

View on CVE.org

Published Oct 27, 2021 CVSS 3.1 · 6.5 Medium EPSS < 1% KEV · Not listed

Description

bookstack is vulnerable to Unrestricted Upload of File with Dangerous Type

Affected Products

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

bookstackapp

bookstackapp/bookstack

affected

Version	Status	Constraints
`unspecified`	affected	< 21.10.1

Configuration 1 [-]

cpe:2.3:a:bookstackapp:bookstack:*:*:*:*:*:*:*:*

No data.

No data available yet.

Remediation

No solution or workaround provided in the CVE record

Tracking

Sign in to view the affected projects.

Advisories

Source	ID	Title
EUVD	EUVD-2021-27134	bookstack is vulnerable to Unrestricted Upload of File with Dangerous Type

Metrics

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact High

Integrity Impact None

Availability Impact None

User Interaction None

Attack Vector Network

Attack Complexity Low

Privileges Required Low

Scope Changed

Confidentiality Impact Low

Integrity Impact Low

Availability Impact None

User Interaction Required

Access Vector Network

Access Complexity Low

Authentication Single

Confidentiality Impact Partial

Integrity Impact None

Availability Impact None

This CVE is not in the KEV list.

Exploit prediction score: < 1% (0.668% probability within 30 days)

Key SSVC decision points have not yet been added.

References

Link	Providers
https://github.com/bookstackapp/bookstack/commit/64937ab826b56d086af9ecea532510d37520ebc8
https://huntr.dev/bounties/f115bdf5-c06b-4627-a6fa-ba6904a43ba3

History

No history.

Subscriptions

Bookstackapp Bookstack

Weaknesses

CWE-434

Sources

CVE record Updated: Aug 3, 2024, 5:09 PM

Status: PUBLISHED
Assigner: @huntrdev
Published: Oct 27, 2021, 9:20 PM
Updated: Aug 3, 2024, 5:09 PM
Reserved: Oct 26, 2021, 12:00 AM

View source JSON

Vulnrichment No data

No data.

NVD Updated: Jun 17, 2026, 4:05 AM

Status: Modified
Published: Oct 27, 2021, 10:15 PM
Modified: Jun 17, 2026, 4:05 AM

View source JSON

Red Hat No data

No data.

OpenCVE enrichment No data

No data.

{"containers": {"cna": {"affected": [{"product": "bookstackapp/bookstack", "vendor": "bookstackapp", "versions": [{"lessThan": "21.10.1", "status": "affected", "version": "unspecified", "versionType": "custom"}]}], "descriptions": [{"lang": "en", "value": "bookstack is vulnerable to Unrestricted Upload of File with Dangerous Type"}], "metrics": [{"cvssV3_0": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 5.4, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "privilegesRequired": "LOW", "scope": "CHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N", "version": "3.0"}}], "problemTypes": [{"descriptions": [{"cweId": "CWE-434", "description": "CWE-434 Unrestricted Upload of File with Dangerous Type", "lang": "en", "type": "CWE"}]}], "providerMetadata": {"dateUpdated": "2021-10-27T21:20:10.000Z", "orgId": "c09c270a-b464-47c1-9133-acb35b22c19a", "shortName": "@huntrdev"}, "references": [{"tags": ["x_refsource_CONFIRM"], "url": "https://huntr.dev/bounties/f115bdf5-c06b-4627-a6fa-ba6904a43ba3"}, {"tags": ["x_refsource_MISC"], "url": "https://github.com/bookstackapp/bookstack/commit/64937ab826b56d086af9ecea532510d37520ebc8"}], "source": {"advisory": "f115bdf5-c06b-4627-a6fa-ba6904a43ba3", "discovery": "EXTERNAL"}, "title": "Unrestricted Upload of File with Dangerous Type in bookstackapp/bookstack", "x_legacyV4Record": {"CVE_data_meta": {"ASSIGNER": "security@huntr.dev", "ID": "CVE-2021-3906", "STATE": "PUBLIC", "TITLE": "Unrestricted Upload of File with Dangerous Type in bookstackapp/bookstack"}, "affects": {"vendor": {"vendor_data": [{"product": {"product_data": [{"product_name": "bookstackapp/bookstack", "version": {"version_data": [{"version_affected": "<", "version_value": "21.10.1"}]}}]}, "vendor_name": "bookstackapp"}]}}, "data_format": "MITRE", "data_type": "CVE", "data_version": "4.0", "description": {"description_data": [{"lang": "eng", "value": "bookstack is vulnerable to Unrestricted Upload of File with Dangerous Type"}]}, "impact": {"cvss": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 5.4, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "privilegesRequired": "LOW", "scope": "CHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N", "version": "3.0"}}, "problemtype": {"problemtype_data": [{"description": [{"lang": "eng", "value": "CWE-434 Unrestricted Upload of File with Dangerous Type"}]}]}, "references": {"reference_data": [{"name": "https://huntr.dev/bounties/f115bdf5-c06b-4627-a6fa-ba6904a43ba3", "refsource": "CONFIRM", "url": "https://huntr.dev/bounties/f115bdf5-c06b-4627-a6fa-ba6904a43ba3"}, {"name": "https://github.com/bookstackapp/bookstack/commit/64937ab826b56d086af9ecea532510d37520ebc8", "refsource": "MISC", "url": "https://github.com/bookstackapp/bookstack/commit/64937ab826b56d086af9ecea532510d37520ebc8"}]}, "source": {"advisory": "f115bdf5-c06b-4627-a6fa-ba6904a43ba3", "discovery": "EXTERNAL"}}}, "adp": [{"providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-03T17:09:09.761Z"}, "title": "CVE Program Container", "references": [{"tags": ["x_refsource_CONFIRM", "x_transferred"], "url": "https://huntr.dev/bounties/f115bdf5-c06b-4627-a6fa-ba6904a43ba3"}, {"tags": ["x_refsource_MISC", "x_transferred"], "url": "https://github.com/bookstackapp/bookstack/commit/64937ab826b56d086af9ecea532510d37520ebc8"}]}]}, "cveMetadata": {"assignerOrgId": "c09c270a-b464-47c1-9133-acb35b22c19a", "assignerShortName": "@huntrdev", "cveId": "CVE-2021-3906", "datePublished": "2021-10-27T21:20:10.000Z", "dateReserved": "2021-10-26T00:00:00.000Z", "dateUpdated": "2024-08-03T17:09:09.761Z", "state": "PUBLISHED"}, "dataType": "CVE_RECORD", "dataVersion": "5.1"}

{"affected": [{"affectedData": [{"product": "bookstackapp/bookstack", "vendor": "bookstackapp", "versions": [{"lessThan": "21.10.1", "status": "affected", "version": "unspecified", "versionType": "custom"}]}], "source": "security@huntr.dev"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:bookstackapp:bookstack:*:*:*:*:*:*:*:*", "matchCriteriaId": "91F81186-7056-4717-BFAE-66CC63117B8F", "versionEndExcluding": "21.10.1", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "bookstack is vulnerable to Unrestricted Upload of File with Dangerous Type"}, {"lang": "es", "value": "bookstack es vulnerable a una Carga no Restringida de Archivos de Tipo Peligroso"}], "id": "CVE-2021-3906", "lastModified": "2026-06-17T04:05:58.017", "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": "nvd@nist.gov", "type": "Primary", "userInteractionRequired": false}], "cvssMetricV30": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 5.4, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "privilegesRequired": "LOW", "scope": "CHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N", "version": "3.0"}, "exploitabilityScore": 2.3, "impactScore": 2.7, "source": "security@huntr.dev", "type": "Secondary"}], "cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 6.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2021-10-27T22:15:07.817", "references": [{"source": "security@huntr.dev", "tags": ["Patch", "Third Party Advisory"], "url": "https://github.com/bookstackapp/bookstack/commit/64937ab826b56d086af9ecea532510d37520ebc8"}, {"source": "security@huntr.dev", "tags": ["Exploit", "Issue Tracking", "Patch", "Third Party Advisory"], "url": "https://huntr.dev/bounties/f115bdf5-c06b-4627-a6fa-ba6904a43ba3"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch", "Third Party Advisory"], "url": "https://github.com/bookstackapp/bookstack/commit/64937ab826b56d086af9ecea532510d37520ebc8"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Exploit", "Issue Tracking", "Patch", "Third Party Advisory"], "url": "https://huntr.dev/bounties/f115bdf5-c06b-4627-a6fa-ba6904a43ba3"}], "sourceIdentifier": "security@huntr.dev", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-434"}], "source": "security@huntr.dev", "type": "Secondary"}]}