EUVD-2026-76764Published

matrix-sdk-ui: Incomplete edit validation

Collected exploitation and prediction evidence

CISA KEV is observed exploitation evidence. FIRST EPSS is a dated prediction of exploitation in the next 30 days. Missing scores are unknown. This collector requests predictions only for explicit CVE aliases in the public NuGet archive; Microsoft release views retain their existing prediction scope.

No collected risk observation for these identifiers. This does not establish absence of exploitation or a zero probability.

cve-program · CVE-2026-45057

Published

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.

Source published: 11 Sep 2026 21:12:17 UTC
Source modified: 14 Sep 2026 16:18:19 UTC
Observed here: 23 Oct 2026 15:48:27 UTC
Source terms: CVE Program Terms of Use

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CVSS 3.1 · 4.9 CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N

euvd · EUVD-2026-76764

Published

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Original publisher date fields

datePublished: Sep 11, 2026, 9:12:17 PM

dateUpdated: Sep 14, 2026, 4:18:19 PM

Source published: Sep 11, 2026, 9:12:17 PM (timezone not stated)
Source modified: Sep 14, 2026, 4:18:19 PM (timezone not stated)
Observed here: 9 Nov 2026 14:05:28 UTC
Source terms: ENISA EUVD · source terms and attribution apply

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EUVD CVSS 3.1 · 4.9 CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N

nvd · CVE-2026-45057

Published

NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON.

Source analysis status: Deferred

Weakness classifications: CWE-345

Original publisher date fields

published: 2026-09-11T21:17:09.517

lastModified: 2026-09-30T19:57:08.043

Source published: 11 Sep 2026 21:17:09 UTC
Source modified: 30 Sep 2026 19:57:08 UTC
Observed here: 25 Oct 2026 10:17:33 UTC
Source terms: NIST NVD usage terms; underlying source attribution retained

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CVSS 3.1 · [email protected] · Secondary · 4.9 CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N

osv · GHSA-h97m-27fx-42rx

Published

### Impact The message edit validation logic in the `matrix-sdk-ui` crate before 0.16.1 is missing a check: when replacing an encrypted event, the replacement event itself is not required to be encrypted. This enables a malicious homeserver administrator (or an actor with equivalent power) to impersonate or spoof messages as if they were sent by a victim user. ### Patches `matrix-sdk-ui` 0.16.1 fixes the message edit validation logic to align with the algorithm for replacement events[^1] described in the Matrix specification. ### Workarounds N/A ### References * Pull request: https://github.com/matrix-org/matrix-rust-sdk/pull/6454 ### For more information If you have any questions or comments about this advisory, please email us at [security at matrix.org](mailto:[email protected]). [^1]: https://spec.matrix.org/unstable/client-server-api/#validity-of-replacement-events

Source published: 4 Jun 2026 14:50:47 UTC
Source modified: 4 Jun 2026 15:00:08 UTC
Observed here: 24 Oct 2026 13:19:54 UTC
Source terms: GitHub Advisory Database · CC-BY-4.0

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CVSS_V3 · CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N

Publisher rating · MODERATE

osv · RUSTSEC-2026-0158

Published

The message edit validation logic in the matrix-sdk-ui crate before 0.16.1 is missing a check: when replacing an encrypted event, the replacement event itself is not required to be encrypted. This enables a malicious homeserver administrator (or an actor with equivalent power) to impersonate or spoof messages as if they were sent by a victim user.

Source published: 3 Jun 2026 12:00:00 UTC
Source modified: 12 Oct 2026 18:00:14 UTC
Observed here: 24 Oct 2026 13:19:54 UTC
Source terms: OSV · upstream source license applies

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This view projects the publisher's source fields for reading; the original JSON retains additional fields and CVE enrichment containers. Attribution: osv · OSV · upstream source license applies. Source text is retained; field grouping and change labels are provided by ChangeIntel.

CVSS_V3 · CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N