CVE-2026-48115Network attack vectorHinoki check available

Unauthorized announcement disclosure via insufficient permission checks

Published Aug 3, 2026 · Updated Aug 3, 2026

Improper authorization in Misskey 2024.5.0 through 2026.5.3 allows remote attackers to read restricted announcements through the server API. The Server Announcements API returns limited announcement data without sufficient permission checks, but the project has not disclosed the affected endpoint or exact authorization logic. No authentication or user interaction is required, and federation state does not affect exposure; the reported impact is limited to confidentiality.

CVSS severity6.3
Medium
EPSS probability0.25%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Improper authorization in Misskey 2024.5.0 through 2026.5.3 allows remote attackers to read restricted announcements through the server API. The Server Announcements API returns limited announcement data without sufficient permission checks, but the project has not disclosed the affected endpoint or exact authorization logic. No authentication or user interaction is required, and federation state does not affect exposure; the reported impact is limited to confidentiality.

The record

CVE
CVE-2026-48115
Published
Aug 3, 2026
Updated
Aug 3, 2026
Vendor
Misskey Project
Product
Misskey
Classifications
CWE-285, T1213
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 3, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=>= 2024.5.0, < 2026.5.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Misskey Project · Misskeyversion=>= 2024.5.0, < 2026.5.4

Published CVSS scores

6.3GitHubCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-285Improper Authorization
T1213Data from Information Repositories

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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