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CVE-2026-48115

Misskey: Improper Authorization in the Announcements API

No known exploitation. EPSS puts it in the 35th percentile. No fix published yet.

CVSS —Not scoredEPSS percentile35th0.4% chance in 30 daysCISA KEVNot listedNo confirmed exploitation
No public exploit knownFixNone yetNo fix or workaround published

Published Updated Sources: CVE.org, NVD

NVD CVE.org

What to do

No fixed build or workaround is published yet. Limit exposure and watch for a patch.

  • Misskey-dev MisskeyAffected: >= 2024.5.0, < 2026.5.4Upgrade to: not statedStated by: CVE record

Versions as the sources state them. Full version matrix after sign-in

What it is

From the CVE record

Misskey is an open source, federated social media platform. All Misskey servers running versions 2024.5.0 and later, but prior to 2026.5.4, contain a vulnerability in the Server Announcements API where insufficient permission checks allow attackers to access limited portions of data that they normally couldn't view. This vulnerability occurs whether or not federation is enabled. This issue has been fixed in version 2026.5.4.

In plain language

No plain-language summary for this CVE yet.

Exploitation

Where each signal puts this CVE on the scale from published to confirmed exploited.

EPSS35th
CISA KEV

Not in the catalog. CISA has not confirmed exploitation.

Public exploits

No public exploit or proof of concept found in the sources we track.

EPSS

0.4% chance of exploitation activity in the next 30 days, which ranks it in the 35th percentile of scored CVEs.

Exploit Prediction Scoring System, FIRST.org. A probability, not a confirmation.

Lifecycle

6 events over 81 days, from the signal feeds we watch.

  1. Record updated
  2. Record updated
  3. Record updated
  4. Publishedweakness classified, record updated

Affected products

Technical detail

Weaknesses

Sources

References in the record

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We'll flag the next CVE, public exploit or patch for Misskey, not every advisory.