CVE-2026-41259Mastodon: Insufficient verification of email addresses
Updated under an hour ago ()
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It affects mastodon and 1 other product. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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Free account, 1 product
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.
- CVSS
- 8.2 HIGH (v4.0, CNA)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
- Weakness (CWE)
- CWE-841
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- GitHub_M
- NVD analysis
- Analyzed
- Record last updated
- Apr 23, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
mastodon mastodon mastodon:mastodon (from the name) | before 4.3.22; from 4.4.0-beta.1, < 4.4.16; from 4.5.0-beta.1, < 4.5.9 | CNA record |
joinmastodon mastodon joinmastodon:mastodon | before 4.3.22; from 4.4.0 before 4.4.16; from 4.5.0 before 4.5.9 | NVD |
References
- https://github.com/mastodon/mastodon/security/advisories/GHSA-5r37-qpwq-2jhhx-refsource-confirm, vendor-advisory
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.