CVE-2026-42553

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...

CVE-2026-42553

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...

CVE-2026-42553

Cinny (Matrix client) before version 4.10.3 is affected by a token-disclosure vulnerability in two parts: (1) EmojiBoard fallback uses an untrusted pack.meta.avatar as a MXC URL, enabling an attacker-controlled HTTP(S) URL in a malicious emote pack; (2) the service worker attaches the user’s Auth...

CVE-2026-42553 Cinny: Access token disclosure via invalidated emoji pack avatar URL in service worker

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...

CVE-2026-42553 Cinny: Access token disclosure via invalidated emoji pack avatar URL in service worker

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...

Cinny 输入验证错误漏洞

Cinny is a simple and secure instant messaging client developed by Cinny OpenSource. Versions of Cinny prior to 4.10.3 contained a vulnerability related to input validation errors. This vulnerability arose due to EmojiBoard using an untrusted pack.meta.avatar as a URL without validation, and...

Origin Validation Error

Overview cinny is a Yet another matrix client Affected versions of this package are vulnerable to Origin Validation Error in the process that handles emoji pack avatar URLs in the service worker. An attacker can obtain a victim's access token by crafting a malicious emote pack with an...

GHSA-J944-W549-3453 Cinny vulnerable to access token disclosure via invalidated emoji pack avatar URL in service worker

Impact 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...

NPM: Cinny vulnerable to access token disclosure via invalidated emoji pack avatar URL in service worker

NPM: Cinny vulnerable to access token disclosure via invalidated emoji pack avatar URL in service worker vulnerability discovered by ? in WordPress Npm cinny versions 4.10.3...

PT-2026-38614

Name of the Vulnerable Software and Affected Versions Cinny versions prior to 4.10.3 Description A remote authenticated attacker who shares a room with a victim and has permissions to create room emotes can cause the victim's client to send their Matrix access token to an attacker-controlled...

Matrix clients -- several vulnerabilities

Matrix developers report: Two critical severity vulnerabilities in end-to-end encryption were found in the SDKs which power Element, Beeper, Cinny, SchildiChat, Circuli, Synod.im and any other clients based on matrix-js-sdk, matrix-ios-sdk or matrix-android-sdk2...

matrix-js-sdk can be tricked into disclosing E2EE room keys to a participating homeserver

Impact A logic error in the room key sharing functionality of matrix-js-sdk before 12.4.1 allows a malicious Matrix homeserver† participating in an encrypted room to steal room encryption keys from affected Matrix clients participating in that room. This allows the homeserver to decrypt end-to-en...

FreeBSD : Matrix clients -- several vulnerabilities (93eb0e48-14ba-11ec-875e-901b0e9408dc)

Matrix developers report : Today we are disclosing a critical security issue affecting multiple Matrix clients and libraries including Element Web/Desktop/Android, FluffyChat, Nheko, Cinny, and SchildiChat. Specifically, in certain circumstances it may be possible to trick vulnerable clients into...

PT-2021-22960 · Cinny +5 · Cinny +7

Name of the Vulnerable Software and Affected Versions: matrix-js-sdk versions prior to 12.4.1 Element Web versions 1.8.2 and earlier Element Desktop versions 1.8.2 and earlier SchildiChat Web versions 1.7.32-sc1 and earlier SchildiChat Desktop versions 1.7.32-sc1 and earlier Cinny versions 1.2.0...

Matrix clients -- several vulnerabilities

Matrix developers report: Today we are disclosing a critical security issue affecting multiple Matrix clients and libraries including Element Web/Desktop/Android, FluffyChat, Nheko, Cinny, and SchildiChat. Specifically, in certain circumstances it may be possible to trick vulnerable clients into...