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Mastodon CVE-2026-41259

| EUVD-2026-25282 HIGH
Improper Enforcement of Behavioral Workflow (CWE-841)
2026-04-23 security-advisories@github.com
Information Disclosure
8.2
CVSS 4.0
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CVSS VectorNVD

CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
X

Lifecycle Timeline

4
Patch released
Apr 28, 2026 - 18:50 nvd
Patch available
Patch available
Apr 23, 2026 - 21:01 EUVD
EUVD ID Assigned
Apr 23, 2026 - 19:27 euvd
EUVD-2026-25282
CVE Published
Apr 23, 2026 - 19:17 nvd
HIGH 8.2

DescriptionNVD

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.

Analysis

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. …

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CVE-2026-41259 vulnerability details – vuln.today
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