CVE-2023-36462

moderate-risk
Published 2023-07-06

Mastodon is a free, open-source social network server based on ActivityPub. Starting in version 2.6.0 and prior to versions 3.5.9, 4.0.5, and 4.1.3, an attacker can craft a verified profile link using specific formatting to conceal arbitrary parts of the link, enabling it to appear to link to a different URL altogether. The link is visually misleading, but clicking on it will reveal the actual link. This can still be used for phishing, though, similar to IDN homograph attacks. Versions 3.5.9, 4.0.5, and 4.1.3 contain a patch for this issue.

Do I need to act?

~
1.5% chance of exploitation in next 30 days
EPSS score — moderate exploit probability
-
Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
5
CVSS 5.4/10 Medium
NETWORK / LOW complexity

Affected Products (1)

Affected Vendors

Joinmastodon

References (10)

Patch https://github.com/mastodon/mastodon/commit/610731b03dfcadd887078cb0399f4e514aa1...
Release Notes https://github.com/mastodon/mastodon/releases/tag/v3.5.9
Release Notes https://github.com/mastodon/mastodon/releases/tag/v4.0.5
Release Notes https://github.com/mastodon/mastodon/releases/tag/v4.1.3
Vendor Advisory https://github.com/mastodon/mastodon/security/advisories/GHSA-55j9-c3mp-6fcq
Patch https://github.com/mastodon/mastodon/commit/610731b03dfcadd887078cb0399f4e514aa1...
Release Notes https://github.com/mastodon/mastodon/releases/tag/v3.5.9
Release Notes https://github.com/mastodon/mastodon/releases/tag/v4.0.5
Release Notes https://github.com/mastodon/mastodon/releases/tag/v4.1.3
Vendor Advisory https://github.com/mastodon/mastodon/security/advisories/GHSA-55j9-c3mp-6fcq
30
/ 100
moderate-risk
Severity 21/34 · High
Exploitability 4/34 · Minimal
Exposure 5/34 · Minimal