CVE-2026-46713: CWE-347: Improper Verification of Cryptographic Signature in misskey-dev misskey
Misskey versions 12.37.0 up to but not including 2026.5.4 contain a vulnerability in the JSON-LD signature validation and compaction process. This flaw allows spoofed activities to be accepted as valid due to improper verification of cryptographic signatures. The issue is fixed in version 2026.5.4. The vulnerability has a high severity with a CVSS 4.0 score of 9.2, indicating critical impact if exploited.
AI Analysis
Technical Summary
CVE-2026-46713 is a vulnerability in the misskey-dev misskey platform affecting versions from 12.37.0 up to 2026.5.4. The flaw lies in improper verification of cryptographic signatures during JSON-LD signature validation and compaction, which can allow attackers to submit spoofed activities that the system accepts as legitimate. This undermines the integrity of federated social media interactions. The vulnerability is classified under CWE-347 (Improper Verification of Cryptographic Signature). It has been resolved in version 2026.5.4.
Potential Impact
Exploitation of this vulnerability could allow attackers to inject spoofed activities into the misskey platform, potentially misleading users or systems relying on the authenticity of these activities. This compromises the trustworthiness of the federated social media platform's data and interactions. No known exploits are reported in the wild at this time.
Mitigation Recommendations
Upgrade affected misskey instances to version 2026.5.4 or later, where the vulnerability has been fixed. No other official remediation or temporary fixes are documented. Patch status is confirmed by the vendor advisory stating the fix is in 2026.5.4.
CVE-2026-46713: CWE-347: Improper Verification of Cryptographic Signature in misskey-dev misskey
Description
Misskey versions 12.37.0 up to but not including 2026.5.4 contain a vulnerability in the JSON-LD signature validation and compaction process. This flaw allows spoofed activities to be accepted as valid due to improper verification of cryptographic signatures. The issue is fixed in version 2026.5.4. The vulnerability has a high severity with a CVSS 4.0 score of 9.2, indicating critical impact if exploited.
CVSS v4.0
Score 9.2critical
Affected software
misskey-dev
misskey
pkg:github/misskey-dev/misskeyRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-46713 is a vulnerability in the misskey-dev misskey platform affecting versions from 12.37.0 up to 2026.5.4. The flaw lies in improper verification of cryptographic signatures during JSON-LD signature validation and compaction, which can allow attackers to submit spoofed activities that the system accepts as legitimate. This undermines the integrity of federated social media interactions. The vulnerability is classified under CWE-347 (Improper Verification of Cryptographic Signature). It has been resolved in version 2026.5.4.
Potential Impact
Exploitation of this vulnerability could allow attackers to inject spoofed activities into the misskey platform, potentially misleading users or systems relying on the authenticity of these activities. This compromises the trustworthiness of the federated social media platform's data and interactions. No known exploits are reported in the wild at this time.
Mitigation Recommendations
Upgrade affected misskey instances to version 2026.5.4 or later, where the vulnerability has been fixed. No other official remediation or temporary fixes are documented. Patch status is confirmed by the vendor advisory stating the fix is in 2026.5.4.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-05-15T23:26:58.309Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6a71103cbf32cb7a344d9fb9
Added to database: 08/03/2026, 22:03:40 UTC
Last enriched: 08/11/2026, 18:22:56 UTC
Last updated: 09/17/2026, 22:01:35 UTC
Views: 51
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