What is CVE-2024-23832?

CVE-2024-23832 is a critical-severity vulnerability in Joinmastodon Mastodon, classified under Authentication Bypass by Spoofing. CVSS score: 9.4/10. Published 2024-02-01.

How severe is CVE-2024-23832?

Critical severity. CVSS v3 base score is 9.4 out of 10.

Vulnerability in Joinmastodon Mastodon

CVE-2024-23832

Mastodon is a free, open-source social network server based on ActivityPub Mastodon allows configuration of LDAP for authentication. Due to insufficient origin validation in all Mastodon, attackers can impersonate and take over any remote account. Every Mastodon version prior to 3.5.17 is vulnerable, as well as 4.0.x versions prior to 4.0.13, 4.1.x version prior to 4.1.13, and 4.2.x versions prior to 4.2.5.

Published 2024-02-01 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.4 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:H.

EPSS exploit prediction

EPSS: 0.025 (84.2th percentile), scored 2026-10-20.

Low probability of exploitation in the next 30 days, but still tracked. 84th percentile — 84.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.025 · newest: 0.025 · change: 0.000

Affected products

Joinmastodon Mastodon
Mastodon — versions < 3.5.17, >= 4.0.0, < 4.0.13, >= 4.1.0, < 4.1.13

Weakness classification (CWE)

CWE-290 — Authentication Bypass by Spoofing

References

github.com/mastodon/mastodon/security/advisories/GHSA-3fjr-858r-92rw (Vendor Advisory)
github.com/mastodon/mastodon/commit/1726085db5cd73dd30953da858f9887bcc90b958 (Patch)
www.openwall.com/lists/oss-security/2024/02/02/4 (Patch, Mailing List)

Frequently asked questions

What is CVE-2024-23832?: CVE-2024-23832 is a critical-severity vulnerability in Joinmastodon Mastodon, classified under Authentication Bypass by Spoofing. CVSS score: 9.4/10. Published 2024-02-01.
How severe is CVE-2024-23832?: Critical severity. CVSS v3 base score is 9.4 out of 10.