What is CVE-2025-62176?

CVE-2025-62176 is a medium-severity vulnerability in Joinmastodon Mastodon, classified under Improper Handling of Insufficient Permissions or Privileges. CVSS score: 4.3/10. Published 2025-10-13.

How severe is CVE-2025-62176?

Medium severity. CVSS v3 base score is 4.3 out of 10.

Vulnerability in Joinmastodon Mastodon

CVE-2025-62176

Mastodon is a free, open-source social network server based on ActivityPub. In Mastodon before 4.4.6, 4.3.14, and 4.2.27, the streaming server accepts serving events for public timelines to clients using any valid authentication token, eve…

EPSS: 0.003 (16.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N.

Affected products

Joinmastodon Mastodon
Mastodon — versions >= 4.4.0-beta.1, < 4.4.6, >= 4.3.0-beta.1, < 4.3.14, < 4.2.27

Weakness classification (CWE)

CWE-280 — Improper Handling of Insufficient Permissions or Privileges

References

security-advisories@github.com (x_refsource_CONFIRM, Vendor Advisory)
security-advisories@github.com (Patch, x_refsource_MISC)

Frequently asked questions

What is CVE-2025-62176?: CVE-2025-62176 is a medium-severity vulnerability in Joinmastodon Mastodon, classified under Improper Handling of Insufficient Permissions or Privileges. CVSS score: 4.3/10. Published 2025-10-13.
How severe is CVE-2025-62176?: Medium severity. CVSS v3 base score is 4.3 out of 10.