CVE-2026-87897

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-87897", "assignerOrgId": "36234546-b8fa-4601-9d6f-f4e334aa8ea1", "state": "PUBLISHED", "assignerShortName": "hackerone", "dateReserved": "2026-09-09T15:00:00.573Z", "datePublished": "2026-10-27T16:15:34.742Z", "dateUpdated": "2026-11-04T17:59:02.350Z"}, "containers": {"cna": {"descriptions": [{"lang": "en", "value": "A SSRF vulnerability found that enables access to internal Chrome Devtools Protocol APIs that can leak the JWT authentication token for another user. A low privileged attacker could continually exploit this vulnerability to leak the JWT authentication token for another user when they start a recording, which then enables the attacker read/write access to the victim's Whiteboard."}], "affected": [{"defaultStatus": "unaffected", "vendor": "Nextcloud", "product": "whiteboard", "versions": [{"version": "1.0.0", "status": "affected", "lessThan": "1.0.0", "versionType": "semver"}]}], "references": [{"url": "https://hackerone.com/reports/3576823"}], "metrics": [{"cvssV3_0": {"version": "3.0", "vectorString": "CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N", "baseScore": 4.6, "baseSeverity": "MEDIUM"}}], "problemTypes": [{"descriptions": [{"type": "CWE", "lang": "en", "cweId": "CWE-918", "description": "CWE-918 Server-Side Request Forgery (SSRF)"}]}], "credits": [{"lang": "en", "value": "alex-elttam (alex-elttam)", "type": "finder"}], "providerMetadata": {"orgId": "36234546-b8fa-4601-9d6f-f4e334aa8ea1", "shortName": "hackerone", "dateUpdated": "2026-10-27T16:15:34.742Z"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-11-04T17:58:52.045220Z", "id": "CVE-2026-87897", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-11-04T17:59:02.350Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-87897", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-11-04T17:58:52.045220Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-11-04T17:58:58.344Z"}}], "cna": {"credits": [{"lang": "en", "type": "finder", "value": "alex-elttam (alex-elttam)"}], "metrics": [{"cvssV3_0": {"version": "3.0", "baseScore": 4.6, "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N"}}], "affected": [{"vendor": "Nextcloud", "product": "whiteboard", "versions": [{"status": "affected", "version": "1.0.0", "lessThan": "1.0.0", "versionType": "semver"}], "defaultStatus": "unaffected"}], "references": [{"url": "https://hackerone.com/reports/3576823"}], "descriptions": [{"lang": "en", "value": "A SSRF vulnerability found that enables access to internal Chrome Devtools Protocol APIs that can leak the JWT authentication token for another user. A low privileged attacker could continually exploit this vulnerability to leak the JWT authentication token for another user when they start a recording, which then enables the attacker read/write access to the victim's Whiteboard."}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-918", "description": "CWE-918 Server-Side Request Forgery (SSRF)"}]}], "providerMetadata": {"orgId": "36234546-b8fa-4601-9d6f-f4e334aa8ea1", "shortName": "hackerone", "dateUpdated": "2026-10-27T16:15:34.742Z"}}}, "cveMetadata": {"cveId": "CVE-2026-87897", "state": "PUBLISHED", "dateUpdated": "2026-11-04T17:59:02.350Z", "dateReserved": "2026-09-09T15:00:00.573Z", "assignerOrgId": "36234546-b8fa-4601-9d6f-f4e334aa8ea1", "datePublished": "2026-10-27T16:15:34.742Z", "assignerShortName": "hackerone"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "whiteboard", "vendor": "Nextcloud", "versions": [{"lessThan": "1.0.0", "status": "affected", "version": "1.0.0", "versionType": "semver"}]}], "source": "support@hackerone.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "A SSRF vulnerability found that enables access to internal Chrome Devtools Protocol APIs that can leak the JWT authentication token for another user. A low privileged attacker could continually exploit this vulnerability to leak the JWT authentication token for another user when they start a recording, which then enables the attacker read/write access to the victim's Whiteboard."}], "id": "CVE-2026-87897", "lastModified": "2026-11-04T18:17:46.150", "metrics": {"cvssMetricV30": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 4.6, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N", "version": "3.0"}, "exploitabilityScore": 2.1, "impactScore": 2.5, "source": "support@hackerone.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-87897", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-11-04T17:58:52.045220Z", "version": "2.0.3"}}]}, "published": "2026-10-27T17:17:03.530", "references": [{"source": "support@hackerone.com", "url": "https://hackerone.com/reports/3576823"}], "sourceIdentifier": "support@hackerone.com", "vulnStatus": "Awaiting Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-918"}], "source": "support@hackerone.com", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[1.0.0,1.0.0)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "cna", "scores": [{"score": 100.0, "source": "cna"}]}, "original": {"product": "whiteboard", "source": "cna", "vendor": "Nextcloud"}, "product": "whiteboard", "vendor": "nextcloud"}], "created": "2026-10-27T17:45:06.457256+00:00", "title": "SSR Leakage of JWT Tokens in Nextcloud Whiteboard via DevTools Protocol", "updated": "2026-10-28T22:12:34.089230+00:00", "vendors": ["nextcloud", "nextcloud$PRODUCT$whiteboard"]}