CVE Explorer

CVE-2026-28431

Misskey is an open source, federated social media platform. All Misskey servers running versions 8.45.0 and later, but prior to 2026.3.1, contain a vulnerability that allows bad actors access to data that they ordinarily wouldn't be able to access due to insufficient permission checks and proper input validation. This vulnerability occurs regardless of whether federation is enabled or not. This vulnerability could lead to a significant data breach. This vulnerability is fixed in 2026.3.1.

Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:23b4c108c39ef0c2867f580d457c9a8806dc40e0c39012d9bea8977ee17fff9f

Known exploited

Not asserted

Disputed

Stale source

Conflicts

Affected products and versions

1 source assertion

{"product":"misskey","vendor":"misskey-dev","versions":[{"status":"affected","version":">= 8.45.0, < 2026.3.1"}]}

cve_program_cvelist_v5affected
urn:baitaphish:normalized-source-record:v2:ff56eee18a2f8f46e720aeb9ce82298aa2ece0a0ec9448a8b54023f3f684a060 · sha256:c592f6bcaa1503e6… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion

{"metric":{"attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"NETWORK","baseScore":9.2,"baseSeverity":"CRITICAL","privilegesRequired":"NONE","subAvailabilityImpact":"NONE","subConfidentialityImpact":"HIGH","subIntegrityImpact":"NONE","userInteraction":"NONE","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N","version":"4.0","vulnAvailabilityImpact":"NONE","vulnConfidentialityImpact":"HIGH","vulnIntegrityImpact":"NONE"},"metric_type":"cvssV4_0"}

cve_program_cvelist_v5cvss
urn:baitaphish:normalized-source-record:v2:ff56eee18a2f8f46e720aeb9ce82298aa2ece0a0ec9448a8b54023f3f684a060 · sha256:c592f6bcaa1503e6… · /containers/cna/metrics/0/cvssV4_0

CWE assertions

1 source assertion

{"cweId":"CWE-285","description":"CWE-285: Improper Authorization","lang":"en","type":"CWE"}

cve_program_cvelist_v5cwe
urn:baitaphish:normalized-source-record:v2:ff56eee18a2f8f46e720aeb9ce82298aa2ece0a0ec9448a8b54023f3f684a060 · sha256:c592f6bcaa1503e6… · /containers/cna/problemTypes/0/descriptions/0

Source references

1 source assertion

{"name":"https://github.com/misskey-dev/misskey/security/advisories/GHSA-r33c-qg3g-v9cr","tags":["x_refsource_CONFIRM"],"url":"https://github.com/misskey-dev/misskey/security/advisories/GHSA-r33c-qg3g-v9cr"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:ff56eee18a2f8f46e720aeb9ce82298aa2ece0a0ec9448a8b54023f3f684a060 · sha256:c592f6bcaa1503e6… · /containers/cna/references/0

Attribution and limitations

CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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