CVE-2026-41259— Mastodon: Insufficient verification of email addresses
Quick assessment
Affected
mastodon mastodon
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
Mastodon是Mastodon开源的一款基于ActivityPub的开源社交网络服务器。 Mastodon v4.5.9之前版本、v4.4.16之前版本和v4.3.22之前版本存在安全漏洞，该漏洞源于未能限制某些邮件服务器解释不同的字符。
Possible ATT&CK Techniques 1 AI
T1133 · External Remote Services
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I. Basic Information for CVE-2026-41259
Vulnerability Information
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Vulnerability Title
Mastodon: Insufficient verification of email addresses
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
行为工作流的不恰当实施
Source: CVE Program / CVE List V5
Vulnerability Title
Mastodon 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Mastodon是Mastodon开源的一款基于ActivityPub的开源社交网络服务器。 Mastodon v4.5.9之前版本、v4.4.16之前版本和v4.3.22之前版本存在安全漏洞，该漏洞源于未能限制某些邮件服务器解释不同的字符。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
II. Public POCs for CVE-2026-41259
| # | POC Description | Source Link | Shenlong Link |
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IV. Related Vulnerabilities
Same product: mastodon
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CVE-2026-59825
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CVE-2026-50129
Mastodon: Persistent anonymous DoS via unhandled NoMethodErr
Same vendor: mastodon
-
CVE-2026-59825
Mastodon: Unwanted deactivation of SSL/TLS certificate verif -
CVE-2026-72916
Mastodon: SSRF Protection Bypass via IPv4-compatible IPv6 Ad -
CVE-2026-72915
Mastodon: Personally-identifying information disclosure due -
CVE-2026-72914
Mastodon: Exhausting data by an unauthenticated request to t -
CVE-2026-50129
Mastodon: Persistent anonymous DoS via unhandled NoMethodErr
Same weakness: CWE-841
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V. Comments for CVE-2026-41259
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