CVE-2024-40648Network attack vector

False identity trust via unchecked own verification

Published Jul 18, 2024 · Updated Aug 2, 2024

Improper authentication in matrix-sdk-crypto before 0.7.2 allows remote attackers controlling a homeserver to make identities appear trusted. UserIdentity::is_verified() checks only whether the local user's identity signed the other identity and omits own_identity.is_verified(), so an unverified trust root still yields true. Exposure requires application code to use this public method for a sensitive trust decision; the crate does not call the method internally.

CVSS severity5.4
Medium
EPSS probability0.28%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper authentication in matrix-sdk-crypto before 0.7.2 allows remote attackers controlling a homeserver to make identities appear trusted. UserIdentity::is_verified() checks only whether the local user's identity signed the other identity and omits own_identity.is_verified(), so an unverified trust root still yields true. Exposure requires application code to use this public method for a sensitive trust decision; the crate does not call the method internally.

The record

CVE
CVE-2024-40648
Published
Jul 18, 2024
Updated
Aug 2, 2024
Vendor
The Matrix.org Foundation
Product
matrix-rust-sdk
Classifications
CWE-287
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 18, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 2, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 0.7.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

The Matrix.org Foundation · matrix-rust-sdkversion=< 0.7.2

Published CVSS scores

5.4GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-287Improper Authentication

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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