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Active filters (1):Package: pkg:github/ether/etherpad

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CVE-2026-55085 is a critical cross-site scripting (XSS) vulnerability in Etherpad, a real-time collaborative editor. Versions prior to 3.3.1 improperly neutralize input when generating web pages, specifically by interpolating an unquoted 'start' attribute in ordered lists. This allows users with write access to inject malicious markup that executes when other users, including administrators, view the pad or its timeslider. The vulnerability is fixed in Etherpad version 3.3.1.

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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.

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