CVE-2026-46713: CWE-347: Improper Verification of Cryptographic Signature in misskey-dev misskey
Misskey, an open source federated social media platform, has a critical vulnerability (CVE-2026-46713) affecting versions 12.37.0 and later up to but not including 2026.5.4. The vulnerability involves improper verification of cryptographic signatures in the JSON-LD signature validation and compaction process, which allows spoofed activities to be accepted as valid. This issue has been fixed in version 2026.5.4.
AI Analysis
Technical Summary
CVE-2026-46713 is a critical vulnerability in misskey-dev's Misskey platform where improper verification of cryptographic signatures (CWE-347) in the JSON-LD signature validation and compaction process allows attackers to submit spoofed activities that are accepted as valid by the system. The flaw affects versions starting from 12.37.0 up to but excluding 2026.5.4. The vulnerability has a CVSS 4.0 base score of 9.2, indicating high exploitability and impact with no privileges or user interaction required. The issue was resolved in version 2026.5.4.
Potential Impact
An attacker can exploit this vulnerability to submit spoofed activities that the platform accepts as valid, potentially undermining the integrity of federated social media interactions. This could lead to misinformation, unauthorized actions, or trust violations within the Misskey network. The vulnerability requires no privileges or user interaction to exploit and can be triggered remotely over the network.
Mitigation Recommendations
A fix is available in Misskey version 2026.5.4. Users and administrators should upgrade affected installations to version 2026.5.4 or later to remediate this vulnerability. Patch status is confirmed by the vendor advisory indicating the issue is fixed in 2026.5.4.
CVE-2026-46713: CWE-347: Improper Verification of Cryptographic Signature in misskey-dev misskey
Description
Misskey, an open source federated social media platform, has a critical vulnerability (CVE-2026-46713) affecting versions 12.37.0 and later up to but not including 2026.5.4. The vulnerability involves improper verification of cryptographic signatures in the JSON-LD signature validation and compaction process, which allows spoofed activities to be accepted as valid. This issue has been fixed in version 2026.5.4.
CVSS v4.0
Score 9.2critical
Affected software
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 critical vulnerability in misskey-dev's Misskey platform where improper verification of cryptographic signatures (CWE-347) in the JSON-LD signature validation and compaction process allows attackers to submit spoofed activities that are accepted as valid by the system. The flaw affects versions starting from 12.37.0 up to but excluding 2026.5.4. The vulnerability has a CVSS 4.0 base score of 9.2, indicating high exploitability and impact with no privileges or user interaction required. The issue was resolved in version 2026.5.4.
Potential Impact
An attacker can exploit this vulnerability to submit spoofed activities that the platform accepts as valid, potentially undermining the integrity of federated social media interactions. This could lead to misinformation, unauthorized actions, or trust violations within the Misskey network. The vulnerability requires no privileges or user interaction to exploit and can be triggered remotely over the network.
Mitigation Recommendations
A fix is available in Misskey version 2026.5.4. Users and administrators should upgrade affected installations to version 2026.5.4 or later to remediate this vulnerability. Patch status is confirmed by the vendor advisory indicating the issue is fixed 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
- Remediation Level
- null
Threat ID: 6a71103cbf32cb7a344d9fb9
Added to database: 08/03/2026, 22:03:40 UTC
Last enriched: 08/03/2026, 22:17:59 UTC
Last updated: 08/04/2026, 00:07:01 UTC
Views: 5
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