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CVE-2026-41259

HIGH · CVSS 7.5 EPSS 0.05% Public Exploit

Source: NVD + CISA KEV + EPSS · Published: 2026-04-23 · Last synced: 2026-05-23

CyberRota Analysis

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Public Exploit Signal

A public exploit, PoC, GitHub repository or Metasploit reference was detected for this CVE.

GitHub PoC Links
github.com ↗

Note: these links are listed for security research and verification purposes only.

CVE
CVE-2026-41259
Severity
HIGH
CVSS
7.5
EPSS
0.05%

Original NVD Description

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 differently by some mailing servers. This vulnerability is fixed in v4.5.9, v4.4.16, and v4.3.22.