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CVE-2026-48115— Misskey: Improper Authorization in the Announcements API

Quick assessment

Affected
misskey-dev misskey
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

misskey-dev misskey是misskey-dev公司的一个去中心化的社交网络服务器软件。 misskey-dev misskey 2024.5.0版本至2026.5.4之前版本存在授权问题漏洞，该漏洞源于Server Announcements API权限检查不足，可能导致攻击者访问其正常无法查看的有限数据。

CVSS 6.3 · Medium EPSS 0.42% · P34

Possible ATT&CK Techniques 1 AI

T1530 · Data from Cloud Storage

Affected Version Matrix 1

VendorProduct Version RangeStatus
misskey-dev misskey >= 2024.5.0, < 2026.5.4 affected
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I. Basic Information for CVE-2026-48115

Vulnerability Information
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Vulnerability Title
Misskey: Improper Authorization in the Announcements API
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
misskey-dev misskey 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
misskey-dev misskey是misskey-dev公司的一个去中心化的社交网络服务器软件。 misskey-dev misskey 2024.5.0版本至2026.5.4之前版本存在授权问题漏洞，该漏洞源于Server Announcements API权限检查不足，可能导致攻击者访问其正常无法查看的有限数据。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
misskey-dev misskey >= 2024.5.0, < 2026.5.4 -

II. Public POCs for CVE-2026-48115

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III. Intelligence Information for CVE-2026-48115

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Vendor Advisories for CVE-2026-48115 (1)

Vendor Pages for CVE-2026-48115 (1)

Same Patch Batch · misskey-dev · 2026-08-03 · 5 CVEs total

CVE-2026-46713 9.2 CRITICAL Misskey: JSON-LD signature validation + compaction may lead to improper activity handling
CVE-2026-47746 8.9 HIGH Misskey: JSON-LD signature validation + compaction is vulnerable to timing attacks
CVE-2026-46714 5.1 MEDIUM Misskey: Denial of Service via Uncontrolled Recursion in Theme Compilation
CVE-2026-46712 2.3 LOW Misskey: Lack of proper permission checks in Direct Messaging feature

IV. Related Vulnerabilities

Same product: misskey
Same vendor: misskey-dev
Same weakness: CWE-285

V. Comments for CVE-2026-48115

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