CVE-2026-45057: matrix-sdk-ui · Insufficient Verification of Data Authenticity
Affects matrix-sdk-uiSource CVE Database V5
Not known to be exploited · CVSS 4.9 Medium : upgrade to 0.16.1 when convenient.
Data as of 27 Oct 2026, 05:11 UTC
- EPSS
- 0.2% chance of exploitation in 30 days – higher than 14% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
- Patch
- Available – fixed in 0.16.1
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:NExploitation evidence
Disclosed: evidence found.
CVE published 11 Sep 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.
What to do
Upgrade matrix-sdk-ui and matrix-org/matrix-sdk-ui to 0.16.1.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| matrix-orgmatrix-sdk-ui | Affected
| Fixed in
|
crates.iomatrix-org/matrix-sdk-uipkg:cargo/matrix-org/matrix-sdk-uiOther threats | Affected
| Fixed in
|
Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.
AI-suggested
Upgrade matrix-sdk-ui to version 0.17.0 or later, which includes the official fix for this vulnerability. No workarounds are available. Applying this update ensures that replacement events are properly validated as encrypted, preventing message spoofing.
Description
matrix-sdk-ui provides GUI-centric utilities on top of matrix-rust-sdk. The message edit validation logic in the `matrix-sdk-ui` crate prior to 0.17.0 is missing a check: when replacing an encrypted event, the replacement event itself is not required to be encrypted. This enables a malicious homeserver administrators (or actors with equivalent power) to impersonate or spoof messages as if they were sent by a victim user. `matrix-sdk-ui` 0.17.0 fixes the message edit validation logic to align with the algorithm for replacement events[^1] described in the Matrix specification. No known workarounds are available.
References
- github.com/matrix-org/matrix-rust-sdk/security/advisories/GHSA-h97m-27fx-42rx (opens in a new tab)
- github.com/matrix-org/matrix-rust-sdk/pull/6454 (opens in a new tab)
- github.com/matrix-org/matrix-rust-sdk/releases/tag/matrix-sdk-0.16.1 (opens in a new tab)
- rustsec.org/advisories/RUSTSEC-2026-0158.html (opens in a new tab)