https://cve.radiocsirt.org/rss/recent/all/10 Most recent entries from all 2026-10-05T19:49:34.175154+00:00 Vulnerability-Lookup csirt@opendfir.org python-feedgen Contains only the most 10 recent entries. https://cve.radiocsirt.org/vuln/cleanstart-2024-ft51773 CLEANSTART-2024-FT51773 — logic error in the room key sharing functionality of matrix-js-sdk (aka Matrix Javascript SDK) before 12 2026-10-05T19:49:34.178807+00:00

Affected: CleanStart: element-web

Security vulnerability affects the element-web package. A logic error in the room key sharing functionality of matrix-js-sdk (aka Matrix Javascript SDK) before 12.

 https://cve.radiocsirt.org/vuln/euvd-2026-31333 EUVD-2026-31333 2026-10-05T19:49:34.178856+00:00 EUVD-2026-31333 https://cve.radiocsirt.org/vuln/fkie_cve-2021-40823 fkie_cve-2021-40823 2026-10-05T19:49:34.178872+00:00

A logic error in the room key sharing functionality of matrix-js-sdk (aka Matrix Javascript SDK) before 12.4.1 allows a malicious Matrix homeserver present in an encrypted room to steal room encryption keys (via crafted Matrix protocol messages) that were originally sent by affected Matrix clients participating in that room. This allows the homeserver to decrypt end-to-end encrypted messages sent by affected clients.

 https://cve.radiocsirt.org/vuln/ghsa-23cm-x6j7-6hq3 GHSA-23cm-x6j7-6hq3 — matrix-js-sdk can be tricked into disclosing E2EE room keys to a participating homeserver 2026-10-05T19:49:34.178895+00:00

Affected: npm: matrix-js-sdk

### 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-end encrypted messages sent by affected clients.

† Or anyone with access to the account of the original recipient of an encrypted message.

Known clients affected (via their use of vulnerable versions of matrix-js-sdk):

- Element Web (1.8.2 and earlier) - Element Desktop (1.8.2 and earlier) - SchildiChat Web (1.7.32-sc1 and earlier) - SchildiChat Desktop (1.7.32-sc1 and earlier) - Cinny (1.2.0 and earlier)

### Patch

This was fixed in https://github.com/matrix-org/matrix-js-sdk/commit/894c24880da0e1cc81818f51c0db80e3c9fb2be9.

### Workarounds To prevent a homeserver from being able to steal the room keys, vulnerable clients can be taken offline or signed out. If signing out, care should be taken to either set up Secure Backup or export E2E room keys in order to preserve access to past messages.

 https://cve.radiocsirt.org/vuln/gsd-2021-40823 gsd-2021-40823 2026-10-05T19:49:34.178932+00:00 gsd-2021-40823 https://cve.radiocsirt.org/vuln/ubuntu-cve-2021-40823 UBUNTU-CVE-2021-40823 2026-10-05T19:49:34.178954+00:00

Affected: Ubuntu:20.04:LTS: node-matrix-js-sdk, Ubuntu:22.04:LTS: node-matrix-js-sdk, Ubuntu:24.04:LTS: node-matrix-js-sdk

A logic error in the room key sharing functionality of matrix-js-sdk (aka Matrix Javascript SDK) before 12.4.1 allows a malicious Matrix homeserver present in an encrypted room to steal room encryption keys (via crafted Matrix protocol messages) that were originally sent by affected Matrix clients participating in that room. This allows the homeserver to decrypt end-to-end encrypted messages sent by affected clients.