CVE-2021-39195 - CVE House

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Status published High CVE-2021-39195

Server-Side Request Forgery vulnerability in misskey

7.7 CVSS

Vulnerability Description

Misskey is an open source, decentralized microblogging platform. In affected versions a Server-Side Request Forgery vulnerability exists in "Upload from URL" and remote attachment handling. This could result in the disclosure of non-public information within the internal network. This has been fixed in 12.90.0. However, if you are using a proxy, you will need to take additional measures. As a workaround this exploit may be avoided by appropriately restricting access to private networks from the host where the application is running.

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

Ensure systems are updated to the latest vendor-supplied patch levels.

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Credits & Attribution

No credits recorded in the NVD database.

References

More from misskey-dev

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misskey.js's export data contains private post data

Misskey Directory Traversal Vulnerability in AiScript via `Mk:api`

@misskey-dev/summaly Redirect Filter Bypass

Misskey CSS Style Injection Vulnerability In `MkUrlPreview`

Affected Vendor

misskey-dev

View all reports →

Affected Software

misskey

Vulnerable Versions:

< 12.90.0

Timeline

Official Publish: September 7th, 2021

Last Modified: August 4th, 2024

Added to House: July 21st, 2026

CVSS Vectors

V3: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N

Weaknesses (CWE)

MITRE ATT&CK TTPs

T1190 Exploit Public-Facing Application

T1213 Data from Information Repositories

T1005 Data from Local System

T1046 Network Service Discovery