/Vulnerability Library

Mastodon - Open Redirect

CVE-2026-33868
Verified

Description

Mastodon version < 4.5.8, < 4.4.15, < 4.3.21 is vulnerable to unauthenticated Open Redirect vulnerability (CWE-601) exists in the /web/* route due to improper handling of URL-encoded path segments.

Severity

Medium

CVSS Score

4.3

Exploit Probability

1%

Affected Product

mastodon

Published Date

March 25, 2026

Template Author

theamanrawat

CVE-2026-33868.yaml
4.3Score

CVSS Metrics

CVSS Vector:
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
CVE ID:
cve-2026-33868
CWE ID:
cwe-601

References

https://github.com/mastodon/mastodon/security/advisories/GHSA-xqw8-4j56-5hj6https://nvd.nist.gov/vuln/detail/CVE-2026-33868

Remediation Steps

Update Mastodon to versions 4.5.8, 4.4.15, 4.3.21.