CVEvulnerability

CVE-2026-41259

8.2 HIGH Published 2026-04-23 Modified 2026-06-17 Official page ↗
Status
Analyzed
Published
2026-04-23
Last modified
2026-06-17
Assigner
[email protected]
CVSS 4.0 ([email protected])
8.2 HIGH — 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
CVSS 3.1 ([email protected])
7.5 HIGH — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Weaknesses
CWE-841

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.

Affected configurations

• joinmastodon mastodon (< 4.3.22) • joinmastodon mastodon (>= 4.4.0 < 4.4.16) • joinmastodon mastodon (>= 4.5.0 < 4.5.9)

Related

Weakness · CWE (1)

  • CWE-841 Improper Enforcement of Behavioral Workflow weakness

References