CVE-2026-7035

creationtimestamp| type| source ---|---|--- 2026-04-26 14:17:15+00:00| seen| https://mastodon.social/users/RedPacketSecurity/statuses/116471403743332437 2026-04-30 18:07:11+00:00| seen| https://bsky.app/profile/cyberhub.blog/post/3mkq7ekvz6p2u...

CVE-2026-41259

Mastodon is a free, open-source social network server based on ActivityPub. Prior to v4.5.9, v4.4.16, and v4.3.22, Mastodon allows restricting new user sign-up based on e-mail domain names, and performs basic validation on e-mail addresses, but fails to restrict characters that are interpreted...

CVE-2026-41259 Mastodon: Insufficient verification of email addresses

Mastodon is a free, open-source social network server based on ActivityPub. Prior to v4.5.9, v4.4.16, and v4.3.22, Mastodon allows restricting new user sign-up based on e-mail domain names, and performs basic validation on e-mail addresses, but fails to restrict characters that are interpreted...

CVE-2026-41259

Mastodon is a free, open-source social network server based on ActivityPub. Prior to v4.5.9, v4.4.16, and v4.3.22, Mastodon allows restricting new user sign-up based on e-mail domain names, and performs basic validation on e-mail addresses, but fails to restrict characters that are interpreted...

EUVD-2026-25282

Mastodon is a free, open-source social network server based on ActivityPub. Prior to v4.5.9, v4.4.16, and v4.3.22, Mastodon allows restricting new user sign-up based on e-mail domain names, and performs basic validation on e-mail addresses, but fails to restrict characters that are interpreted...

CVE-2026-41259

CVE-2026-41259 affects Mastodon prior to versions 4.5.9, 4.4.16, and 4.3.22. The issue is insufficient verification of email addresses: Mastodon allows restricting new user sign-up by domain but does not properly handle characters that some mail servers interpret differently. Root cause is incomp...

CVE-2026-41259 Mastodon: Insufficient verification of email addresses

Mastodon is a free, open-source social network server based on ActivityPub. Prior to v4.5.9, v4.4.16, and v4.3.22, Mastodon allows restricting new user sign-up based on e-mail domain names, and performs basic validation on e-mail addresses, but fails to restrict characters that are interpreted...

CVE-2026-41259 Mastodon: Insufficient verification of email addresses

Mastodon is a free, open-source social network server based on ActivityPub. Prior to v4.5.9, v4.4.16, and v4.3.22, Mastodon allows restricting new user sign-up based on e-mail domain names, and performs basic validation on e-mail addresses, but fails to restrict characters that are interpreted...

PT-2026-34728

Name of the Vulnerable Software and Affected Versions Mastodon versions prior to 4.5.9 Mastodon versions prior to 4.4.16 Mastodon versions prior to 4.3.22 Description Mastodon allows restricting new user sign-up based on e-mail domain names and performs basic validation on e-mail addresses, but i...

Mastodon 安全漏洞

Mastodon is an open-source social networking server based on ActivityPub. Versions of Mastodon prior to 4.5.9, 4.4.16, and 4.3.22 contained security vulnerabilities due to a lack of mechanisms to prevent certain email servers from interpreting characters differently...

CVE-2026-6198

creationtimestamp| type| source ---|---|--- 2026-04-13 20:00:11+00:00| seen| https://mastodon.social/ap/users/115755483699003887/statuses/116399152239781958 2026-04-13 21:08:08+00:00| seen| https://bsky.app/profile/cve.skyfleet.blue/post/3mjfrkm6hwx2z 2026-04-13 21:22:51+00:00|...

EUVD-2024-33814

The Include Mastodon Feed plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the plugin's 'include-mastodon-feed' shortcode in all versions up to, and including, 1.9.5 due to insufficient input sanitization and output escaping on user supplied attributes. This makes it possible...

BIT-MASTODON-2026-33869 Mastodon has a denial of service for quote authorization

Mastodon is a free, open-source social network server based on ActivityPub. In versions on the 4.5.x branch prior to 4.5.8 and on the 4.4.x branch prior to 4.4.15, an attacker that knows of a quote before it has reached a server can prevent it from being correctly processed on that server. The...

BIT-MASTODON-2026-33868 Mastodon has a GET-Based Open Redirect via '/web/%2F<domain>'

Mastodon is a free, open-source social network server based on ActivityPub. Prior to versions 4.5.8, 4.4.15, and 4.3.21, an unauthenticated Open Redirect vulnerability CWE-601 exists in the /web/ route due to improper handling of URL-encoded path segments. An attacker can craft a specially encode...

ANT-2026-6DSMTXZ8 · mastodon · SSRF

ssrf high GHSA-crr4-7rm4-8gpw Severity Claude high · Security research firm high · Maintainer unknown Discovered by Claude Mythos Preview REPORT Anthropic's analysis, sealed at approval. Disclosure to the maintainer was performed by Doyensec. ANT-2026-6DSMTXZ8: SSRF Bypass via IPv6 Unspecified...

ANT-2026-P2DWB2SK · mastodon · Signature-bypass

signature-bypass high GHSA-chgx-jx3p-rf73 Severity Claude high · Security research firm high · Maintainer unknown Discovered by Claude Mythos Preview REPORT Anthropic's analysis, sealed at approval. Disclosure to the maintainer was performed by Doyensec. ANT-2026-P2DWB2SK: LD-Signature bypass via...

CVE-2026-33869

Mastodon is a free, open-source social network server based on ActivityPub. In versions on the 4.5.x branch prior to 4.5.8 and on the 4.4.x branch prior to 4.4.15, an attacker that knows of a quote before it has reached a server can prevent it from being correctly processed on that server. The...

CVE-2026-33868

Mastodon is a free, open-source social network server based on ActivityPub. Prior to versions 4.5.8, 4.4.15, and 4.3.21, an unauthenticated Open Redirect vulnerability CWE-601 exists in the /web/ route due to improper handling of URL-encoded path segments. An attacker can craft a specially encode...

CVE-2026-33868

Mastodon is a free, open-source social network server based on ActivityPub. Prior to versions 4.5.8, 4.4.15, and 4.3.21, an unauthenticated Open Redirect vulnerability CWE-601 exists in the /web/ route due to improper handling of URL-encoded path segments. An attacker can craft a specially encode...

CVE-2026-33869

Mastodon is a free, open-source social network server based on ActivityPub. In versions on the 4.5.x branch prior to 4.5.8 and on the 4.4.x branch prior to 4.4.15, an attacker that knows of a quote before it has reached a server can prevent it from being correctly processed on that server. The...