PT-2026-28542 · Mastodon · Mastodon

Clearlyclaire · Published 2026-03-27 · Updated 2026-03-31 · CVE-2026-33869

Positive Technologies (AI Summary)

CVSS v3.1

4.8

Medium

Base vector

AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L

Name of the Vulnerable Software and Affected Versions Mastodon versions 4.5.0 through 4.5.7 Mastodon versions 4.4.0 through 4.4.14

Description Mastodon is a free, open-source social network server based on ActivityPub. An attacker who is aware of a quote before it has reached a server can prevent the quote from being correctly processed on that server. This issue affects versions 4.5.x prior to 4.5.8 and 4.4.x prior to 4.4.15. Versions 4.3 and earlier are not affected as they do not support quotes.

Recommendations Update Mastodon to version 4.5.8 or later. Update Mastodon to version 4.4.15 or later.

Exploit

Fix

Incorrect Authorization

Weakness Enumeration

CWE-863

Related Identifiers

BIT-MASTODON-2026-33869

CVE-2026-33869

GHSA-Q4G8-82C5-9H33

Affected Products

Mastodon

References · 6

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/33xxx/CVE-2026-33869.json · Exploit
• https://github.com/mastodon/mastodon/security/advisories/GHSA-q4g8-82c5-9h33 · Vendor Advisory
• https://osv.dev/vulnerability/BIT-mastodon-2026-33869 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2026-33869 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-33869 · Security Note
• https://twitter.com/CVEnew/status/2037719409259884820 · Twitter Post