{"id":"EUVD-2026-32612","revision":"8f04d6ce584c432d9e0d215916356ab9","records":[{"revision":"8f04d6ce584c432d9e0d215916356ab9","observedAt":"2026-11-01T07:14:14.249+00:00","statement":{"source":"euvd","id":"EUVD-2026-32612","aliases":["CVE-2026-42553","GHSA-j944-w549-3453"],"title":"Cinny is a Matrix client. Prior to 4.10.3, A remote authenticated attacker who shares a room with a victim and has permissions to create room emotes (for example in a DM) can cause the victim's client to send their Matrix access token to an…","description":"Cinny is a Matrix client. Prior to 4.10.3, A remote authenticated attacker who shares a room with a victim and has permissions to create room emotes (for example in a DM) can cause the victim's client to send their Matrix access token to an attacker-controlled server. This occurs when the victim opens the emoji or sticker picker for the room containing a malicious emote pack. This is caused by an incorrect fallback in EmojiBoard that uses untrusted pack.meta.avatar (user-controlled) without converting/validating it as an MXC URL, allowing arbitrary HTTP(S) URLs to be used. Also, the service worker attaching the user's Authorization bearer token to all outbound GET requests whose URL contains /_matrix/client/v1/media/download or /_matrix/client/v1/media/thumbnail without verifying the request host matches the configured homeserver origin. An attacker-controlled URL containing those path fragments and permissive CORS will receive the victim's Authorization header (access token). This vulnerability is fixed in 4.10.3.","state":0,"publishedAt":null,"modifiedAt":null,"affected":[],"metrics":[{"system":"EUVD CVSS 4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N","score":7.1,"severity":null}],"references":["https://github.com/cinnyapp/cinny/security/advisories/GHSA-j944-w549-3453","https://github.com/cinnyapp/cinny/releases/tag/v4.10.3"],"sourceUrl":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-32612","license":"ENISA EUVD · source terms and attribution apply","enrichment":{"sourceStatus":null,"weaknesses":[],"productCriteria":[],"sourceDates":{"datePublished":"May 27, 2026, 5:27:26 PM","dateUpdated":"May 27, 2026, 6:01:39 PM"},"relatedAdvisories":[],"note":"EUVD source date text has no stated timezone and is retained without inventing a UTC instant. Related bulletin membership is not an alias, common cause or applicability claim. A missing vector with a zero score is treated as unrated. Complete vendor/product and underlying source evidence remains in the original JSON."},"key":"euvd:EUVD-2026-32612","identifiers":["EUVD-2026-32612","CVE-2026-42553","GHSA-j944-w549-3453"]},"retained":false,"historicalAffected":[]}],"coverage":[]}