CVE-2026-41259
Last modified
CVE-2026-41259 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. 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. EPSS estimates a 0.21% chance of exploitation in the next 30 days.
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.
Metrics
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Joinmastodon | Mastodon | < 4.3.22 |
| Joinmastodon | Mastodon | >= 4.4.0, < 4.4.16 |
| Joinmastodon | Mastodon | >= 4.5.0, < 4.5.9 |
References
Timeline
- Published
- Last Modified
- Status
- Analyzed
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How Strix Helps
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