HOMEVULNERABILITIESCVE-2026-28431
HIGH

CVE-2026-28431

CWE-285Published: March 10, 2026· Updated: Mar 13, 2026

7.5
CVSS v3.1
EPSS:0.04%probability of exploitation in 30 daysPercentile:12.1th

Official Description

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.

NVD Source

Technical Analysis

CVE-2026-28431 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), with a CVSS base score of 7.5.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityNone
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Affected Vendors & Products

misskey1 product
misskey
Source: NVD CPE · 1 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
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Official Patches & Advisories

ADVISORYhttps://github.com/misskey-dev/misskey/security/advisories/GHSA-r33c-qg3g-v9cr

All References (1)

→
https://github.com/misskey-dev/misskey/security/advisories/GHSA-r33c-qg3g-v9crVendor Advisory

Quick Facts

CVE IDCVE-2026-28431
CVSS Score7.5 / 10
SeverityHIGH
WeaknessCWE-285
CISA KEVNo
EPSS (30d)0.04%
Affected1 vendor
PublishedMar 10, 2026

Related CVEs (CWE-285)

CVE-2026-5412
9.9
CVE-2026-30956
9.9
CVE-2026-33105
9.8
CVE-2026-7663
9.8
CVE-2026-32213
9.8
CVE-2026-10580
9.8

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2026-28431 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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