CVE-2026-45057

MEDIUMPre-NVD 4.94.9
EchelonGraph scoreLOW confidence

This medium-severity CVE scores 4.9 under the CNA's CVSS (NVD's own analysis pending). EPSS exploit probability: 0.0%, top 95% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: cna:github_m, epss
4.9
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 4.9Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

matrix-sdk-ui: Incomplete edit validation

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.

[^1]: https://spec.matrix.org/unstable/client-server-api/#validity-of-replacement-events

CVSS v3
4.9
EG Score
4.9(low)
EPSS
5.3%
KEV
Not listed

Published

June 4, 2026

Last Modified

June 4, 2026

Vendor Advisories for CVE-2026-45057(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Affected Packages

(1 across 1 ecosystem)
crates.io(1)
PackageVulnerable rangeFixed inDependents
matrix-sdk-ui—0.16.1—

Data Freshness Timeline

(refreshed 4× in last 7d / 29× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-08 09:42 UTCEG score recompute
  2. 2026-07-06 02:56 UTCEG score recompute
  3. 2026-07-03 20:18 UTCEG score recompute
  4. 2026-07-02 21:04 UTCEG score recompute
  5. 2026-07-01 21:43 UTCEG score recompute
  6. 2026-06-30 22:30 UTCEG score recompute
  7. 2026-06-29 23:17 UTCEG score recompute
  8. 2026-06-29 00:05 UTCEG score recompute
  9. 2026-06-28 00:36 UTCEG score recompute
  10. 2026-06-27 01:18 UTCEG score recompute
  11. 2026-06-26 01:20 UTCEG score recompute
  12. 2026-06-25 00:48 UTCEG score recompute
  13. 2026-06-24 01:29 UTCEG score recompute
  14. 2026-06-23 02:17 UTCEG score recompute
  15. 2026-06-20 12:10 UTCEG score recompute
  16. 2026-06-19 04:27 UTCEG score recompute
  17. 2026-06-18 03:58 UTCEG score recompute
  18. 2026-06-17 04:45 UTCEG score recompute
  19. 2026-06-16 05:34 UTCEG score recompute
  20. 2026-06-15 06:21 UTCEG score recompute
  21. 2026-06-14 23:18 UTCEPSS rescore
  22. 2026-06-14 07:09 UTCEG score recompute
  23. 2026-06-13 23:00 UTCEPSS rescore
  24. 2026-06-13 07:58 UTCEG score recompute
  25. 2026-06-12 23:12 UTCEPSS rescore
Show 9 more
  1. 2026-06-12 08:45 UTCEG score recompute
  2. 2026-06-11 09:33 UTCEG score recompute
  3. 2026-06-10 10:21 UTCEG score recompute
  4. 2026-06-09 11:09 UTCEG score recompute
  5. 2026-06-08 11:57 UTCEG score recompute
  6. 2026-06-07 12:45 UTCEG score recompute
  7. 2026-06-06 13:33 UTCEG score recompute
  8. 2026-06-05 14:22 UTCEG score recompute
  9. 2026-06-04 15:10 UTCEG score recompute

Frequently asked(5)

What is CVE-2026-45057?
CVE-2026-45057 is a medium vulnerability published on June 4, 2026. matrix-sdk-ui: Incomplete edit validation 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…
When was CVE-2026-45057 disclosed?
CVE-2026-45057 was first published in the National Vulnerability Database on June 4, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-45057 actively exploited?
CVE-2026-45057 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 5.3% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-45057?
CVE-2026-45057 has a CVSS v4.0 base score of 4.9 (CNA self-assessment; NVD's own analysis pending). The EG score is currently aggregating — additional source signals are being incorporated as they become available..
How do I remediate CVE-2026-45057?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-45057, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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