TI-2025-38493 Aliases CVE-2025-62175

Mastodon streaming API fails to disconnect disabled and suspended users

LOW 20CWE-273Published 2025-10-13 · Updated 2025-10-14

Key facts

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

Attack profile from CVSS 3.1 · CNA. Fix status from CNA.

Summary

Mastodon is a free, open-source social network server based on ActivityPub. In versions before 4.4.6, 4.3.14, and 4.2.27, disabling or suspending a user account does not disconnect the account from the streaming API. This allows disabled or suspended accounts to continue receiving real-time updates through existing streaming connections and to establish new streaming connections, even though they cannot interact with other API endpoints. This undermines moderation actions, as administrators expect disabled or suspended accounts to be fully disconnected from the service. This issue has been patched in versions 4.4.6, 4.3.14, and 4.2.27. No known workarounds exist.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00235 14th percentileScored 2026-11-07

Fix Fixed mastodon (mastodon): 4.4.6, 4.3.14, 4.2.27

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
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	4.4.0-beta.1 to before 4.4.6; 4.3.0-beta.1 to before 4.3.14; before 4.2.27	4.4.6, 4.3.14, 4.2.27	Patch available	CNA

mastodon Vendormastodon Affected 4.4.0-beta.1 to before 4.4.6; 4.3.0-beta.1 to before 4.3.14; before 4.2.27 Fixed in 4.4.6, 4.3.14, 4.2.27 Patch available CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:joinmastodon:mastodon::::::::	before 4.2.27; 4.3.0 to before 4.3.14; 4.4.0 to before 4.4.6	Vulnerable	mastodon

cpe:2.3:a:joinmastodon:mastodon:*:*:*:*:*:*:*:* Versions before 4.2.27; 4.3.0 to before 4.3.14; 4.4.0 to before 4.4.6 Vulnerable ·mastodon

Remediation

Fix · CNA mastodon (mastodon) Fixed in 4.4.6, 4.3.14, 4.2.27

Timeline

2026-10-02 Threatist record created from CVE-2025-62175

References

Patch 1

https://github.com/mastodon/mastodon/commit/2971ac9863b91372e68ac152caf6f4dbff511d17

Advisory 1

https://github.com/mastodon/mastodon/security/advisories/GHSA-r2fh-jr9c-9pxh

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