TI-2024-15826 Aliases CVE-2024-23832

Mastodon Remote user impersonation and takeover

MEDIUM 53CWE-290Published 2024-02-01 · Updated 2025-02-13

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: Security bypass
Confidentiality · integrity · availability: High · High · High
Fix status: Fixed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-290.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.02452 84th percentileScored 2026-11-07

Fix Fixed mastodon (mastodon): 3.5.17, 4.0.13, 4.1.13 +1

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: Yes
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
mastodon	mastodon	before 3.5.17; 4.0.0 to before 4.0.13; 4.1.0 to before 4.1.13; 4.2.0 to before 4.2.5	3.5.17, 4.0.13, 4.1.13, 4.2.5	Patch available	CNA

mastodon Vendormastodon Affected before 3.5.17; 4.0.0 to before 4.0.13; 4.1.0 to before 4.1.13; 4.2.0 to before 4.2.5 Fixed in 3.5.17, 4.0.13, 4.1.13, 4.2.5 Patch available CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:joinmastodon:mastodon::::::::	before 3.5.17; 4.0.0 to before 4.0.13; 4.1.0 to before 4.1.13; 4.2.0 to before 4.2.5	Vulnerable	mastodon

cpe:2.3:a:joinmastodon:mastodon:*:*:*:*:*:*:*:* Versions before 3.5.17; 4.0.0 to before 4.0.13; 4.1.0 to before 4.1.13; 4.2.0 to before 4.2.5 Vulnerable ·mastodon

Remediation

Fix · CNA mastodon (mastodon) Fixed in 3.5.17, 4.0.13, 4.1.13, 4.2.5

Timeline

2026-10-02 Threatist record created from CVE-2024-23832

References

Patch 2

Advisory 1

https://github.com/mastodon/mastodon/security/advisories/GHSA-3fjr-858r-92rw

TI-2022-02004 Improper Restriction of Excessive Authentication Attempts in mastodon/mastodon CVSS 3.1CRITICAL 9.8
TI-2025-34613 Mastodon e‑mail throttle misconfiguration allows unlimited email confirmations against unconfirmed emails CVSS 3.1HIGH 7.5
TI-2022-22936 Mastodon through 4.0.2 allows attackers to cause a denial of service (large Sidekiq pull… CVSS 3.1HIGH 7.5
TI-2023-18301 Mastodon vulnerable to arbitrary file creation through media attachments CVSS 3.1CRITICAL 10.0
TI-2023-13359 Mastodon's blind LDAP injection in login allows the attacker to leak arbitrary attributes from LDAP database CVSS 3.1HIGH 7.7
TI-2024-16846 External OpenID Connect Account Takeover by E-Mail Change in mastodon CVSS 3.1HIGH 7.4

See all 41 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences