Improper Restriction of Excessive Authentication Attempts in mastodon/mastodon
Priority HIGH 82CWE-307Published · Updated
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-307.
Summary
Improper Restriction of Excessive Authentication Attempts in GitHub repository mastodon/mastodon prior to 4.0.0.
Why it matters now
Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.01133 66th percentileScored 2026-11-07
Fix Fixed mastodon/mastodon (mastodon): 4.0.0
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- Automatable
- Yes
- Technical impact
- Total
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/mastodon | before 4.0.0 | 4.0.0 | Patch available | CNA |
- mastodon/mastodon Vendormastodon Affected before 4.0.0 Fixed in 4.0.0 Patch available CNA
CPE configurations NVD · 5
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:joinmastodon:mastodon:*:*:*:*:*:*:*:* | up to 3.5.5 | Vulnerable | mastodon |
| cpe:2.3:a:joinmastodon:mastodon:4.0.0:rc1:*:*:*:*:*:* | 4.0.0 rc1 | Vulnerable | mastodon |
| cpe:2.3:a:joinmastodon:mastodon:4.0.0:rc2:*:*:*:*:*:* | 4.0.0 rc2 | Vulnerable | mastodon |
| cpe:2.3:a:joinmastodon:mastodon:4.0.0:rc3:*:*:*:*:*:* | 4.0.0 rc3 | Vulnerable | mastodon |
| cpe:2.3:a:joinmastodon:mastodon:4.0.0:rc4:*:*:*:*:*:* | 4.0.0 rc4 | Vulnerable | mastodon |
- cpe:2.3:a:joinmastodon:mastodon:*:*:*:*:*:*:*:* Versions up to 3.5.5 Vulnerable ·mastodon
- cpe:2.3:a:joinmastodon:mastodon:4.0.0:rc1:*:*:*:*:*:* Versions 4.0.0 rc1 Vulnerable ·mastodon
- cpe:2.3:a:joinmastodon:mastodon:4.0.0:rc2:*:*:*:*:*:* Versions 4.0.0 rc2 Vulnerable ·mastodon
- cpe:2.3:a:joinmastodon:mastodon:4.0.0:rc3:*:*:*:*:*:* Versions 4.0.0 rc3 Vulnerable ·mastodon
- cpe:2.3:a:joinmastodon:mastodon:4.0.0:rc4:*:*:*:*:*:* Versions 4.0.0 rc4 Vulnerable ·mastodon
Remediation
- Fix · CNA mastodon/mastodon (mastodon) Fixed in 4.0.0
Timeline
- 2026-10-02 Threatist record created from CVE-2022-2166
- 2026-10-03 Alias added: GHSA-q5qv-4wvf-4v9h
References
More Mastodon vulnerabilities
- 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
- TI-2024-15826 Mastodon Remote user impersonation and takeover CVSS 3.1CRITICAL 9.8
Sources
- CVE-2022-2166 · CVE Program
- CVE-2022-2166 · NVD
- FIRST EPSS
- GHSA-q5qv-4wvf-4v9h · GitHub Advisory Database · CC BY 4.0
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