CVE-2026-57575: CWE-918: Server-Side Request Forgery (SSRF) in misskey-dev misskey
Misskey, an open source federated social media platform, has a Server-Side Request Forgery (SSRF) vulnerability in its URL preview functionality prior to version 2026.6.0. The vulnerability allows a remote attacker to cause the server to initiate HTTP requests to internal network addresses due to missing network restrictions before outbound connections. Although IP address validation occurs after the request is sent and rejects the process, no sensitive internal data is believed to be exposed. This issue is fixed in version 2026.6.0.
AI Analysis
Technical Summary
CVE-2026-57575 is a Server-Side Request Forgery (SSRF) vulnerability in the UrlPreviewService of Misskey versions before 2026.6.0. The vulnerability arises because the application does not enforce network restrictions before establishing outbound HTTP connections for URL previews, allowing an attacker to make the server send requests to loopback, private, or link-local IP addresses. However, since IP validation happens post-request and rejects the connection, sensitive internal data is not believed to be leaked. The vulnerability is addressed in Misskey version 2026.6.0.
Potential Impact
An attacker can induce the Misskey server to send HTTP requests to internal network addresses, potentially enabling scanning or interaction with internal services. However, due to the post-request IP validation and rejection, no sensitive internal data is believed to be disclosed to the attacker. There are no known exploits in the wild.
Mitigation Recommendations
Upgrade Misskey to version 2026.6.0 or later, where this SSRF vulnerability is fixed. No other mitigation is indicated or required according to the available information.
CVE-2026-57575: CWE-918: Server-Side Request Forgery (SSRF) in misskey-dev misskey
Description
Misskey, an open source federated social media platform, has a Server-Side Request Forgery (SSRF) vulnerability in its URL preview functionality prior to version 2026.6.0. The vulnerability allows a remote attacker to cause the server to initiate HTTP requests to internal network addresses due to missing network restrictions before outbound connections. Although IP address validation occurs after the request is sent and rejects the process, no sensitive internal data is believed to be exposed. This issue is fixed in version 2026.6.0.
CVSS v4.0
Score 6.9medium
Affected software
pkg:github/misskey-dev/misskeyRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-57575 is a Server-Side Request Forgery (SSRF) vulnerability in the UrlPreviewService of Misskey versions before 2026.6.0. The vulnerability arises because the application does not enforce network restrictions before establishing outbound HTTP connections for URL previews, allowing an attacker to make the server send requests to loopback, private, or link-local IP addresses. However, since IP validation happens post-request and rejects the connection, sensitive internal data is not believed to be leaked. The vulnerability is addressed in Misskey version 2026.6.0.
Potential Impact
An attacker can induce the Misskey server to send HTTP requests to internal network addresses, potentially enabling scanning or interaction with internal services. However, due to the post-request IP validation and rejection, no sensitive internal data is believed to be disclosed to the attacker. There are no known exploits in the wild.
Mitigation Recommendations
Upgrade Misskey to version 2026.6.0 or later, where this SSRF vulnerability is fixed. No other mitigation is indicated or required according to the available information.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-06-24T18:49:56.208Z
- Cvss Version
- 4.0
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a515e2368715ace43325a1d
Added to database: 07/10/2026, 21:03:31 UTC
Last enriched: 07/10/2026, 21:18:00 UTC
Last updated: 07/10/2026, 21:18:00 UTC
Views: 4
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