CVE-2021-29503 - OpenCVE

Vendors	Products
Hedgedoc	Hedgedoc

Link	Resource
https://github.com/hedgedoc/hedgedoc/commit/01dad5821ee28377ebe640c6c72c3e0bb0d51ea7	Patch Third Party Advisory
https://github.com/hedgedoc/hedgedoc/releases/tag/1.8.2	Third Party Advisory
https://github.com/hedgedoc/hedgedoc/security/advisories/GHSA-gjg7-4j2h-94fq	Patch Third Party Advisory

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As a workaround, one can disable guest edits until the next update."}], "metrics": [{"cvssV3_1": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 8.1, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N", "version": "3.1"}}], "problemTypes": [{"descriptions": [{"cweId": "CWE-80", "description": "CWE-80: Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS)", "lang": "en", "type": "CWE"}]}], "providerMetadata": {"dateUpdated": "2021-05-19T19:55:10", "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M"}, "references": [{"tags": ["x_refsource_CONFIRM"], "url": "https://github.com/hedgedoc/hedgedoc/security/advisories/GHSA-gjg7-4j2h-94fq"}, {"tags": ["x_refsource_MISC"], "url": "https://github.com/hedgedoc/hedgedoc/commit/01dad5821ee28377ebe640c6c72c3e0bb0d51ea7"}, {"tags": ["x_refsource_MISC"], "url": "https://github.com/hedgedoc/hedgedoc/releases/tag/1.8.2"}], "source": {"advisory": "GHSA-gjg7-4j2h-94fq", "discovery": "UNKNOWN"}, "title": "Improper Neutralization of Script-Related HTML Tags in Notes", "x_legacyV4Record": {"CVE_data_meta": {"ASSIGNER": "security-advisories@github.com", "ID": "CVE-2021-29503", "STATE": "PUBLIC", "TITLE": "Improper Neutralization of Script-Related HTML Tags in Notes"}, "affects": {"vendor": {"vendor_data": [{"product": {"product_data": [{"product_name": "hedgedoc", "version": {"version_data": [{"version_value": "< 1.8.2"}]}}]}, "vendor_name": "hedgedoc"}]}}, "data_format": "MITRE", "data_type": "CVE", "data_version": "4.0", "description": {"description_data": [{"lang": "eng", "value": "HedgeDoc is a platform to write and share markdown. HedgeDoc before version 1.8.2 is vulnerable to a cross-site scripting attack using the YAML-metadata of a note. An attacker with write access to a note can embed HTML tags in the Open Graph metadata section of the note, resulting in the frontend rendering the script tag as part of the `<head>` section. Unless your instance prevents guests from editing notes, this vulnerability allows unauthenticated attackers to inject JavaScript into notes that allow guest edits. If your instance prevents guests from editing notes, this vulnerability allows authenticated attackers to inject JavaScript into any note pages they have write-access to. This vulnerability is patched in version 1.8.2. As a workaround, one can disable guest edits until the next update."}]}, "impact": {"cvss": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 8.1, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N", "version": "3.1"}}, "problemtype": {"problemtype_data": [{"description": [{"lang": "eng", "value": "CWE-80: Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS)"}]}]}, "references": {"reference_data": [{"name": "https://github.com/hedgedoc/hedgedoc/security/advisories/GHSA-gjg7-4j2h-94fq", "refsource": "CONFIRM", "url": "https://github.com/hedgedoc/hedgedoc/security/advisories/GHSA-gjg7-4j2h-94fq"}, {"name": "https://github.com/hedgedoc/hedgedoc/commit/01dad5821ee28377ebe640c6c72c3e0bb0d51ea7", "refsource": "MISC", "url": "https://github.com/hedgedoc/hedgedoc/commit/01dad5821ee28377ebe640c6c72c3e0bb0d51ea7"}, {"name": "https://github.com/hedgedoc/hedgedoc/releases/tag/1.8.2", "refsource": "MISC", "url": "https://github.com/hedgedoc/hedgedoc/releases/tag/1.8.2"}]}, "source": {"advisory": "GHSA-gjg7-4j2h-94fq", "discovery": "UNKNOWN"}}}}, "cveMetadata": {"assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "assignerShortName": "GitHub_M", "cveId": "CVE-2021-29503", "datePublished": "2021-05-19T19:55:10", "dateReserved": "2021-03-30T00:00:00", "dateUpdated": "2021-05-19T19:55:10", "state": "PUBLISHED"}, "dataType": "CVE_RECORD", "dataVersion": "5.0"}

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Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Changed

Confidentiality Impact Low

Integrity Impact Low

Availability Impact None

User Interaction Required

Access Vector Network

Access Complexity Medium

Authentication None

Confidentiality Impact None

Integrity Impact Partial

Availability Impact None

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Changed

Confidentiality Impact Low

Integrity Impact Low

Availability Impact None

User Interaction Required

Access Vector Network

Access Complexity Medium

Authentication None

Confidentiality Impact None

Integrity Impact Partial

Availability Impact None

JSON object

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