Machine-written summary
Summary written by Claude Haiku from the source advisory. Not reviewed by a person.
The matrix-sdk-ui crate, versions before 0.16.1, does not check that an edit replacing an encrypted message is itself encrypted. A malicious homeserver administrator, or an actor with equivalent power, can use this to impersonate or spoof messages as if a victim user sent them. Upgrade matrix-sdk-ui to 0.16.1 or later.
Not analysed yet
We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.
Severity and exploitation
| Score | Rating | CVSS | Vector | Source |
|---|---|---|---|---|
| 4.9 | Medium | 3.1 | CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N | CNA (GitHub_M) |
- CISA KEV Not listed.
- EPSS 0.0023, the 14th percentile, on 10 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.
Timeline
- 31 Oct 2026, 14:24 UTC First seen by agentprime
- 31 Oct 2026, 14:24 UTC Confirmed by OSV