CVE-2026-46714

Misskey web client (versions 8.63.0 and later prior to 2026.5.4) is vulnerable to a DoS caused by a malformed theme triggering uncontrolled recursion during theme compilation, which can slow or crash the client. The issue is fixed in version 2026.5.4. Remediation is to upgrade to 2026.5.4 or late...

CVE-2026-47746

CVE-2026-47746 affects Misskey (open source federated social platform). Affected versions are 12.37.0 and later, up to but not including 2026.5.4. The issue is a TOCTOU vulnerability in timing attacks during JSON-LD signature validation and the JSON-LD compaction process, caused by a non-shared p...

CVE-2026-46713

Misskey VM Misskey: CVE-2026-46713 affects Misskey 12.37.0 and later (before 2026.5.4). The issue lies in the JSON-LD signature validation and compaction process, allowing spoofed activities to be accepted as valid. The vulnerability is addressed in version 2026.5.4. Remediation: update to 2026.5...

EUVD-2026-52451

Misskey is an open source, federated social media platform. Versions 2025.3.2 and later, but prior to 2026.5.4, contain a vulnerability where a lack of proper permission checks allows access to certain data points from the Direct Messages formerly Chat feature, regardless of account permissions...

CVE-2026-46712

Misskey (versions 2025.3.2 and later, prior to 2026.5.4) contains a permission-check vulnerability in the Direct Messages feature that lets access certain data points regardless of account permissions, even when federation is disabled. Notes with the new TODO visibility (formerly direct) are unaf...

EUVD-2026-52449

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...

CVE-2026-48115

CVE-2026-48115 affects Misskey servers running versions 2024.5.0 and later, up to but not including 2026.5.4, where the Server Announcements API lacks sufficient permission checks, allowing attackers to access data they normally shouldn’t view. The issue exists regardless of federation being enab...

CVE-2026-57574

Misskey is an open source, federated social media platform. Prior to 2026.6.0, Misskey contains a vulnerability in Time-based One-Time Password TOTP authentication in UserAuthService where insufficient validation of used tokens allows the reuse of a single-use code within its valid time step. If...

CVE-2026-57575

Misskey is an open source, federated social media platform. Prior to 2026.6.0, Misskey contains a Server-Side Request Forgery SSRF vulnerability in URL preview functionality in UrlPreviewService. Due to missing network restrictions before establishing outbound connections, a remote attacker can...

CVE-2026-57574 Misskey: TOTP tokens can be reused

Misskey is an open source, federated social media platform. Prior to 2026.6.0, Misskey contains a vulnerability in Time-based One-Time Password TOTP authentication in UserAuthService where insufficient validation of used tokens allows the reuse of a single-use code within its valid time step. If...

CVE-2026-57574

Misskey is an open source, federated social media platform. Prior to 2026.6.0, Misskey contains a vulnerability in Time-based One-Time Password TOTP authentication in UserAuthService where insufficient validation of used tokens allows the reuse of a single-use code within its valid time step. If...

CVE-2026-57574 Misskey: TOTP tokens can be reused

Misskey is an open source, federated social media platform. Prior to 2026.6.0, Misskey contains a vulnerability in Time-based One-Time Password TOTP authentication in UserAuthService where insufficient validation of used tokens allows the reuse of a single-use code within its valid time step. If...

CVE-2026-57574

This CVE affects Misskey, an open-source federated social platform, where the vulnerability resides in the Time-based One-Time Password (TOTP) authentication in UserAuthService. The issue results from insufficient validation of used TOTP tokens, allowing a single-use code to be reused within its ...

CVE-2026-57575 Misskey: SSRF bypass in URL Preview

Misskey is an open source, federated social media platform. Prior to 2026.6.0, Misskey contains a Server-Side Request Forgery SSRF vulnerability in URL preview functionality in UrlPreviewService. Due to missing network restrictions before establishing outbound connections, a remote attacker can...

CVE-2026-57575

Misskey (open source federated social platform) contains a Server-Side Request Forgery (SSRF) vulnerability in the UrlPreviewService prior to version 2026.6.0. The issue arises from insufficient network restrictions before outbound requests, allowing an attacker to trigger the Misskey server to i...

CVE-2026-57575 Misskey: SSRF bypass in URL Preview

Misskey is an open source, federated social media platform. Prior to 2026.6.0, Misskey contains a Server-Side Request Forgery SSRF vulnerability in URL preview functionality in UrlPreviewService. Due to missing network restrictions before establishing outbound connections, a remote attacker can...

CVE-2026-57575

Misskey is an open source, federated social media platform. Prior to 2026.6.0, Misskey contains a Server-Side Request Forgery SSRF vulnerability in URL preview functionality in UrlPreviewService. Due to missing network restrictions before establishing outbound connections, a remote attacker can...

CVE-2026-28433

Misskey is an open source, federated social media platform. All Misskey servers running versions 10.93.0 and later, but prior to 2026.3.1, contain a vulnerability that allows importing other users' data due to lack of ownership validation. The impact of this vulnerability is estimated to be...

CVE-2026-28432

Misskey is an open source, federated social media platform. All Misskey servers prior to 2026.3.1 contain a vulnerability that allows bypassing HTTP signature verification. Although this is a vulnerability related to federation, it affects all servers regardless of whether federation is enabled o...

CVE-2026-28431

Misskey is an open source, federated social media platform. All Misskey servers running versions 8.45.0 and later, but prior to 2026.3.1, contain a vulnerability that allows bad actors access to data that they ordinarily wouldn't be able to access due to insufficient permission checks and proper...