CVE-2024-47080Network attack vector

Historical-key disclosure via unverified-device forwarding

Published Oct 15, 2024 · Updated Oct 15, 2024

Information disclosure in The Matrix.org Foundation matrix-js-sdk 9.11.0 through 34.7.0 allows remote attackers to read historical messages. MatrixClient.sendSharedHistoryKeys forwards shared history keys to every invited-user device without verifying the user's cryptographic identity or the device signature. Exploitation requires a malicious homeserver, an invitation flow, the legacy crypto stack, and a call to the affected method; Rust crypto clients are unaffected.

CVSS severity8.7
High
EPSS probability0.68%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in The Matrix.org Foundation matrix-js-sdk 9.11.0 through 34.7.0 allows remote attackers to read historical messages. MatrixClient.sendSharedHistoryKeys forwards shared history keys to every invited-user device without verifying the user's cryptographic identity or the device signature. Exploitation requires a malicious homeserver, an invitation flow, the legacy crypto stack, and a call to the affected method; Rust crypto clients are unaffected.

The record

CVE
CVE-2024-47080
Published
Oct 15, 2024
Updated
Oct 15, 2024
Vendor
The Matrix.org Foundation
Product
matrix-js-sdk
Classifications
CWE-287, CWE-200, T1557
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 15, 2024CVE publishedPublication date reported by the CVE source.
  2. Oct 15, 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=>= 9.11.0, < 34.8.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Matrix.org Foundation · matrix-js-sdkversion=>= 9.11.0, < 34.8.0

Published CVSS scores

8.7GitHub CNACVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA: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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-287Improper Authentication
CWE-200Exposure of Sensitive Information to an Unauthorized Actor
T1557Adversary-in-the-Middle

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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