Vulnerability details
CVE-2026-46713
misskey-dev misskey
Misskey: JSON-LD signature validation + compaction may lead to improper activity handling
CVSS 4.0
9.2Critical
Official description
Misskey is an open source, federated social media platform. Versions 12.37.0 and later, but prior to 2026.5.4, contain a vulnerability in the JSON-LD signature validation and compaction process that allows spoofed activities to be accepted as valid. This issue has been fixed in version 2026.5.4.
CVSS scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 9.2Critical | 4.0 | CVEProject cvelistV5 (CNA) (GitHub_M) | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:H/VA:N/SC:N/SI:H/SA:N |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| misskey-dev | misskey | >= 12.37.0, < 2026.5.4 | CVEProject cvelistV5 (CNA) |
References and advisories
2- https://github.com/misskey-dev/misskey/security/advisories/GHSA-w8x2-gpq6-jxvf x_refsource_CONFIRM
- https://github.com/misskey-dev/misskey/releases/tag/2026.5.4 x_refsource_MISC
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Details
- Published
- 2026-08-04
- Last updated
- 2026-08-04
- State
- Published
- Assigner (CNA)
- GitHub_M
Exploit prediction (EPSS)
0.28%
Probability of exploitation in 30 days
20.5%
Percentile (among all CVEs)
SSVC assessment (CISA)
- Automatable
- Yes
- Exploitation
- None
- Technical impact
- Partial
Weaknesses (CWE)
- CWE-347Improper Verification of Cryptographic Signature