CVE-2026-55089

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{"affected": [{"affectedData": [{"product": "etherpad", "vendor": "ether", "versions": [{"status": "affected", "version": ">= 2.1.0, < 3.1.0"}]}], "source": "security-advisories@github.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Etherpad is a real-time collaborative editor. From 2.1.0 until 3.1.0, Etherpad's src/node/handler/APIHandler.ts authorizes requests to /api/2/* in the authorization_code OAuth path by using requiredClaims with the admin claim. This check requires only that the claim exists, while src/node/security/OAuth2Provider.ts issues admin: false for configured non-admin users. A non-admin user with a valid signed token can therefore invoke administrative functions including setHTML, setText, appendText, deletePad, copyPad, movePad, restoreRevision, anonymizeAuthor, listAllPads, and listAuthorsOfPad, allowing disclosure, modification, or deletion of pads across the instance. This issue is fixed in version 3.1.0."}, {"lang": "es", "value": "Etherpad es un editor colaborativo en tiempo real. Desde la versi\u00f3n 2.1.0 hasta la 3.1.0, src/node/gestor/APIHandler.ts de Etherpad autoriza solicitudes a /api/2/* en la ruta OAuth de authorization_code mediante el uso de requiredClaims con la declaraci\u00f3n admin. Esta verificaci\u00f3n solo requiere que la declaraci\u00f3n exista, mientras que src/node/security/OAuth2Provider.ts emite admin: false para usuarios no administradores configurados. Un usuario no administrador con un token firmado v\u00e1lido puede, por lo tanto, invocar funciones administrativas, incluyendo setHTML, setText, appendText, deletePad, copyPad, movePad, restoreRevision, anonymizeAuthor, listAllPads y listAuthorsOfPad, permitiendo la divulgaci\u00f3n, modificaci\u00f3n o eliminaci\u00f3n de pads en toda la instancia. Este problema est\u00e1 solucionado en la versi\u00f3n 3.1.0."}], "id": "CVE-2026-55089", "lastModified": "2026-10-24T16:10:00.153", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "LOW", "baseScore": 9.9, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:L", "version": "3.1"}, "exploitabilityScore": 3.1, "impactScore": 6.0, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-55089", "options": [{"exploitation": "poc"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-08-19T19:48:52.330922Z", "version": "2.0.3"}}]}, "published": "2026-08-19T20:17:18.050", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/ether/etherpad/commit/8c6104c5d5daf41f0d454acc04d42dffa0e0d996"}, {"source": "security-advisories@github.com", "url": "https://github.com/ether/etherpad/pull/7784"}, {"source": "security-advisories@github.com", "url": "https://github.com/ether/etherpad/releases/tag/v3.1.0"}, {"source": "security-advisories@github.com", "url": "https://github.com/ether/etherpad/security/advisories/GHSA-qfmh-fph3-mw8q"}, {"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "url": "https://github.com/ether/etherpad/security/advisories/GHSA-qfmh-fph3-mw8q"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-863"}], "source": "security-advisories@github.com", "type": "Primary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[2.1.0,3.1.0)"}}], "enrichment": {"confidence": 90.0, "confidence_source": "matching", "scores": [{"score": 90.0, "source": "matching"}]}, "original": {"product": "etherpad", "source": "cna", "vendor": "ether"}, "product": "etherpad", "vendor": "etherpad"}], "created": "2026-08-19T23:30:17.089073+00:00", "updated": "2026-08-21T13:03:28.162768+00:00", "vendors": ["etherpad", "etherpad$PRODUCT$etherpad"]}