CVE-2024-32983Network attack vector

Remote-account impersonation via unnormalized signed activities

Published Jun 3, 2024 · Updated Aug 2, 2024

Incorrect authorization in Misskey before 2024.5.0 allows remote attackers to impersonate remote accounts through signed ActivityPub activities. The inbox processor verifies the Linked Data Signature but processes the original JSON structure instead of its compacted JSON-LD representation. Exploitation requires a valid signature from the target account and permits spoofed activities of any type to be attributed to that account.

CVSS severity8.2
High
EPSS probability0.40%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Incorrect authorization in Misskey before 2024.5.0 allows remote attackers to impersonate remote accounts through signed ActivityPub activities. The inbox processor verifies the Linked Data Signature but processes the original JSON structure instead of its compacted JSON-LD representation. Exploitation requires a valid signature from the target account and permits spoofed activities of any type to be attributed to that account.

The record

CVE
CVE-2024-32983
Published
Jun 3, 2024
Updated
Aug 2, 2024
Vendor
Misskey Project
Product
Misskey
Classifications
CWE-863, T1656
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 3, 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=< 2024.5.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Misskey Project · Misskeyversion=< 2024.5.0

Published CVSS scores

7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
8.2GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/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.

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-863Incorrect Authorization
T1656Impersonation

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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