{"api_version":"1","generated_at":"2026-07-07T12:03:40+00:00","cve":"CVE-2026-13323","urls":{"html":"https://cve.report/CVE-2026-13323","api":"https://cve.report/api/cve/CVE-2026-13323.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-13323","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-13323"},"summary":{"title":"CVE-2026-13323","description":"In Open VSX Registry before 1.0.2, the /vscode/unpkg/ endpoint serves user-supplied HTML files with Content-Type: text/html and without a Content-Security-Policy or Content-Disposition: attachment response header. An unauthenticated attacker can register a publisher account, upload a VSIX containing a crafted HTML payload, and induce an authenticated user to visit the resulting URL. The browser renders the file inline in the open-vsx.org origin context, enabling session token exfiltration, persistent Personal Access Token (PAT) generation, and unauthorized publication of malicious extension versions. Because Open VSX extensions are distributed to VS Code, VSCodium, Cursor, Windsurf, and compatible editors, a compromised extension update constitutes a supply chain attack against all downstream users.","state":"PUBLISHED","assigner":"eclipse","published_at":"2026-07-01 12:16:38","updated_at":"2026-07-06 20:33:10"},"problem_types":["CWE-79","CWE-79 CWE-79 Improper neutralization of input during web page generation ('cross-site scripting')"],"metrics":[{"version":"3.1","source":"nvd@nist.gov","type":"Primary","score":"8.7","severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N","data":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N","baseScore":8.7,"baseSeverity":"HIGH","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"REQUIRED","scope":"CHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"NONE"}},{"version":"3.1","source":"emo@eclipse.org","type":"Secondary","score":"4.1","severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:N/I:L/A:N","data":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:N/I:L/A:N","baseScore":4.1,"baseSeverity":"MEDIUM","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"REQUIRED","scope":"CHANGED","confidentialityImpact":"NONE","integrityImpact":"LOW","availabilityImpact":"NONE"}},{"version":"3.1","source":"CNA","type":"CVSS","score":"4.1","severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:N/I:L/A:N","data":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":4.1,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"LOW","privilegesRequired":"LOW","scope":"CHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:N/I:L/A:N","version":"3.1"}}],"references":[{"url":"https://gitlab.eclipse.org/security/vulnerability-reports/-/work_items/485","name":"https://gitlab.eclipse.org/security/vulnerability-reports/-/work_items/485","refsource":"134c704f-9b21-4f2e-91b3-4a467353bcc0","tags":["Exploit","Issue Tracking","Vendor Advisory"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://github.com/eclipse-openvsx/openvsx/pull/1922","name":"https://github.com/eclipse-openvsx/openvsx/pull/1922","refsource":"emo@eclipse.org","tags":["Issue Tracking","Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-13323","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-13323","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Eclipse Foundation","product":"Eclipse Open VSX","version":"affected 0.1.0 1.0.2 semver","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[{"source":"CNA","value":"Golan Myers","lang":"en"}],"nvd_cpes":[{"cve_year":"2026","cve_id":"13323","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"eclipse","cpe5":"open_vsx","cpe6":"*","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"}],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"13323","cve":"CVE-2026-13323","epss":"0.001690000","percentile":"0.066030000","score_date":"2026-07-06","updated_at":"2026-07-07 00:05:09"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"adp":[{"metrics":[{"other":{"content":{"id":"CVE-2026-13323","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","timestamp":"2026-07-01T12:13:20.675139Z","version":"2.0.3"},"type":"ssvc"}}],"providerMetadata":{"dateUpdated":"2026-07-01T12:19:20.920Z","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP"},"references":[{"tags":["exploit"],"url":"https://gitlab.eclipse.org/security/vulnerability-reports/-/work_items/485"}],"title":"CISA ADP Vulnrichment"}],"cna":{"affected":[{"defaultStatus":"unaffected","product":"Eclipse Open VSX","vendor":"Eclipse Foundation","versions":[{"lessThan":"1.0.2","status":"affected","version":"0.1.0","versionType":"semver"}]}],"credits":[{"lang":"en","type":"reporter","value":"Golan Myers"}],"descriptions":[{"lang":"en","supportingMedia":[{"base64":false,"type":"text/html","value":"In Open VSX Registry before <code>1.0.2</code>, the <code>/vscode/unpkg/</code> endpoint serves user-supplied HTML files with <code>Content-Type: text/html</code> and without a <code>Content-Security-Policy</code> or <code>Content-Disposition: attachment</code> response header. An unauthenticated attacker can register a publisher account, upload a VSIX containing a crafted HTML payload, and induce an authenticated user to visit the resulting URL. The browser renders the file inline in the <code>open-vsx.org</code> origin context, enabling session token exfiltration, persistent Personal Access Token (PAT) generation, and unauthorized publication of malicious extension versions. Because Open VSX extensions are distributed to VS Code, VSCodium, Cursor, Windsurf, and compatible editors, a compromised extension update constitutes a supply chain attack against all downstream users."}],"value":"In Open VSX Registry before 1.0.2, the /vscode/unpkg/ endpoint serves user-supplied HTML files with Content-Type: text/html and without a Content-Security-Policy or Content-Disposition: attachment response header. An unauthenticated attacker can register a publisher account, upload a VSIX containing a crafted HTML payload, and induce an authenticated user to visit the resulting URL. The browser renders the file inline in the open-vsx.org origin context, enabling session token exfiltration, persistent Personal Access Token (PAT) generation, and unauthorized publication of malicious extension versions. Because Open VSX extensions are distributed to VS Code, VSCodium, Cursor, Windsurf, and compatible editors, a compromised extension update constitutes a supply chain attack against all downstream users."}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":4.1,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"LOW","privilegesRequired":"LOW","scope":"CHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:N/I:L/A:N","version":"3.1"},"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}]}],"problemTypes":[{"descriptions":[{"cweId":"CWE-79","description":"CWE-79 Improper neutralization of input during web page generation ('cross-site scripting')","lang":"en","type":"CWE"}]}],"providerMetadata":{"dateUpdated":"2026-07-01T11:28:20.888Z","orgId":"e51fbebd-6053-4e49-959f-1b94eeb69a2c","shortName":"eclipse"},"references":[{"url":"https://gitlab.eclipse.org/security/vulnerability-reports/-/work_items/485"},{"url":"https://github.com/eclipse-openvsx/openvsx/pull/1922"}],"source":{"discovery":"UNKNOWN"},"x_generator":{"engine":"Vulnogram 1.0.2"}}},"cveMetadata":{"assignerOrgId":"e51fbebd-6053-4e49-959f-1b94eeb69a2c","assignerShortName":"eclipse","cveId":"CVE-2026-13323","datePublished":"2026-07-01T11:28:20.888Z","dateReserved":"2026-06-25T09:14:56.817Z","dateUpdated":"2026-07-01T12:19:20.920Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-07-01 12:16:38","lastModifiedDate":"2026-07-06 20:33:10","problem_types":["CWE-79","CWE-79 CWE-79 Improper neutralization of input during web page generation ('cross-site scripting')"],"metrics":{"cvssMetricV31":[{"source":"emo@eclipse.org","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:N/I:L/A:N","baseScore":4.1,"baseSeverity":"MEDIUM","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"REQUIRED","scope":"CHANGED","confidentialityImpact":"NONE","integrityImpact":"LOW","availabilityImpact":"NONE"},"exploitabilityScore":2.3,"impactScore":1.4},{"source":"nvd@nist.gov","type":"Primary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N","baseScore":8.7,"baseSeverity":"HIGH","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"REQUIRED","scope":"CHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"NONE"},"exploitabilityScore":2.3,"impactScore":5.8}],"ssvcV203":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","ssvcData":{"timestamp":"2026-07-01T12:13:20.675139Z","id":"CVE-2026-13323","options":[{"exploitation":"none"},{"automatable":"no"},{"technicalImpact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}]},"configurations":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:eclipse:open_vsx:*:*:*:*:*:*:*:*","versionEndExcluding":"1.0.2","matchCriteriaId":"B5F7F9F8-48A6-4604-8CA4-65FCF39BA2FD"}]}]}]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"13323","Ordinal":"1","Title":"CVE-2026-13323","CVE":"CVE-2026-13323","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"13323","Ordinal":"1","NoteData":"In Open VSX Registry before 1.0.2, the /vscode/unpkg/ endpoint serves user-supplied HTML files with Content-Type: text/html and without a Content-Security-Policy or Content-Disposition: attachment response header. An unauthenticated attacker can register a publisher account, upload a VSIX containing a crafted HTML payload, and induce an authenticated user to visit the resulting URL. The browser renders the file inline in the open-vsx.org origin context, enabling session token exfiltration, persistent Personal Access Token (PAT) generation, and unauthorized publication of malicious extension versions. Because Open VSX extensions are distributed to VS Code, VSCodium, Cursor, Windsurf, and compatible editors, a compromised extension update constitutes a supply chain attack against all downstream users.","Type":"Description","Title":"CVE-2026-13323"}]}}}