CVE-2026-77166

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-77166", "assignerOrgId": "36234546-b8fa-4601-9d6f-f4e334aa8ea1", "state": "PUBLISHED", "assignerShortName": "hackerone", "dateReserved": "2026-08-20T15:00:00.606Z", "datePublished": "2026-09-21T15:25:33.269Z", "dateUpdated": "2026-09-21T18:43:30.904Z"}, "containers": {"cna": {"descriptions": [{"lang": "en", "value": "The emoji field in the page emoji update endpoint does not properly validate user input. By injecting long text and line breaks, the sidebar layout becomes broken and can hide other items."}], "affected": [{"defaultStatus": "unaffected", "vendor": "Nextcloud", "product": "Collectives", "versions": [{"version": "3.2.1", "status": "affected", "lessThanOrEqual": "3.5.0", "versionType": "semver"}]}], "references": [{"url": "https://hackerone.com/reports/3599470"}], "metrics": [{"cvssV3_0": {"version": "3.0", "vectorString": "CVSS:3.0/AV:N/AC:L/PR:H/UI:R/S:U/C:N/I:L/A:N", "baseScore": 2.4, "baseSeverity": "LOW"}}], "problemTypes": [{"descriptions": [{"type": "CWE", "lang": "en", "cweId": "CWE-840", "description": "CWE-840 Business Logic Errors"}]}], "credits": [{"lang": "en", "value": "_dha (yoyomiski)", "type": "finder"}], "providerMetadata": {"orgId": "36234546-b8fa-4601-9d6f-f4e334aa8ea1", "shortName": "hackerone", "dateUpdated": "2026-09-21T15:25:33.269Z"}}, "adp": [{"references": [{"url": "https://hackerone.com/reports/3599470", "tags": ["exploit"]}], "metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-09-21T18:42:53.420732Z", "id": "CVE-2026-77166", "options": [{"Exploitation": "poc"}, {"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": "2026-09-21T18:43:30.904Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-77166", "role": "CISA Coordinator", "options": [{"Exploitation": "poc"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-09-21T18:42:53.420732Z"}}}], "references": [{"url": "https://hackerone.com/reports/3599470", "tags": ["exploit"]}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-09-21T18:43:24.375Z"}}], "cna": {"credits": [{"lang": "en", "type": "finder", "value": "_dha (yoyomiski)"}], "metrics": [{"cvssV3_0": {"version": "3.0", "baseScore": 2.4, "baseSeverity": "LOW", "vectorString": "CVSS:3.0/AV:N/AC:L/PR:H/UI:R/S:U/C:N/I:L/A:N"}}], "affected": [{"vendor": "Nextcloud", "product": "Collectives", "versions": [{"status": "affected", "version": "3.2.1", "versionType": "semver", "lessThanOrEqual": "3.5.0"}], "defaultStatus": "unaffected"}], "references": [{"url": "https://hackerone.com/reports/3599470"}], "descriptions": [{"lang": "en", "value": "The emoji field in the page emoji update endpoint does not properly validate user input. By injecting long text and line breaks, the sidebar layout becomes broken and can hide other items."}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-840", "description": "CWE-840 Business Logic Errors"}]}], "providerMetadata": {"orgId": "36234546-b8fa-4601-9d6f-f4e334aa8ea1", "shortName": "hackerone", "dateUpdated": "2026-09-21T15:25:33.269Z"}}}, "cveMetadata": {"cveId": "CVE-2026-77166", "state": "PUBLISHED", "dateUpdated": "2026-09-21T18:43:30.904Z", "dateReserved": "2026-08-20T15:00:00.606Z", "assignerOrgId": "36234546-b8fa-4601-9d6f-f4e334aa8ea1", "datePublished": "2026-09-21T15:25:33.269Z", "assignerShortName": "hackerone"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Collectives", "vendor": "Nextcloud", "versions": [{"lessThanOrEqual": "3.5.0", "status": "affected", "version": "3.2.1", "versionType": "semver"}]}], "source": "support@hackerone.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "The emoji field in the page emoji update endpoint does not properly validate user input. By injecting long text and line breaks, the sidebar layout becomes broken and can hide other items."}], "id": "CVE-2026-77166", "lastModified": "2026-09-22T20:00:03.713", "metrics": {"cvssMetricV30": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 2.4, "baseSeverity": "LOW", "confidentialityImpact": "NONE", "integrityImpact": "LOW", "privilegesRequired": "HIGH", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.0/AV:N/AC:L/PR:H/UI:R/S:U/C:N/I:L/A:N", "version": "3.0"}, "exploitabilityScore": 0.9, "impactScore": 1.4, "source": "support@hackerone.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-77166", "options": [{"exploitation": "poc"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-09-21T18:42:53.420732Z", "version": "2.0.3"}}]}, "published": "2026-09-21T16:17:24.013", "references": [{"source": "support@hackerone.com", "url": "https://hackerone.com/reports/3599470"}, {"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "url": "https://hackerone.com/reports/3599470"}], "sourceIdentifier": "support@hackerone.com", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-840"}], "source": "support@hackerone.com", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[3.2.1,3.5.0]"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "Collectives", "source": "cna", "vendor": "Nextcloud"}, "product": "collectives", "vendor": "nextcloud"}], "created": "2026-09-21T16:45:17.845592+00:00", "title": "Inadequate Input Validation in Emoji Update Endpoint Causes Layout Breakage", "updated": "2026-09-21T17:00:09.677746+00:00", "vendors": ["nextcloud", "nextcloud$PRODUCT$collectives"]}