Vulnerability · Published Sep 7, 2021 · Assigned by GitHub_M

CVE-2021-39195Server-Side Request Forgery vulnerability in misskey

High 7.7

In plain English

A high-severity server-side request forgery in misskey from misskey-dev. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.1% (higher than 65% of all known vulnerabilities).

Severity (CVSS 3.1)7.7High

Exploit odds (30 days)1.1%top 35.2% of all CVEs

Exploited in the wildNo reportsnot in CISA KEV

Attack toolingNoneno public tooling known

Official 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.

Affected products (as reported)

Vendor	Product	Versions
misskey-dev	misskey	< 12.90.0

Weakness: CWE-918 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N

References

https://github.com/misskey-dev/misskey/security/advisories/GHSA-mqv7-gxh4-r5vf x_refsource_CONFIRM
https://github.com/misskey-dev/misskey/commit/e1a8b158e04ad567d92d8daf3cc0898ee18f1a2e x_refsource_MISC
https://github.com/misskey-dev/misskey/blob/develop/CHANGELOG.md#12900-20210904 x_refsource_MISC