CVE-2025-27157

Mastodon is a self-hosted, federated microblogging platform. Starting in version 4.2.0 and prior to versions 4.2.16 and 4.3.4, the rate limits are missing on `/auth/setup`. Without those rate limits, an attacker can craft requests that will send an email to an arbitrary addresses. Versions 4.2.16 and 4.3.4 fix the issue.

CVSS v3 5.3 MEDIUM

5.3^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 3.9 / Impact : 1.4

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact LOW

Scope UNCHANGED

References

Link	Resource
https://github.com/mastodon/mastodon/commit/06f879ce9bea195344ac9f71e6799eea500628ec	Patch
https://github.com/mastodon/mastodon/security/advisories/GHSA-v39f-c9jj-8w7h	Vendor Advisory

Configurations

Configuration 1 (hide)

OR	cpe:2.3:a:joinmastodon:mastodon::::::::
	cpe:2.3:a:joinmastodon:mastodon::::::::

History

No history.

Information

Published : 2025-02-27 17:15

Updated : 2025-06-24 15:59

NVD link : CVE-2025-27157

Mitre link : CVE-2025-27157

CVE.ORG link : CVE-2025-27157

JSON object : View

Products Affected

joinmastodon

mastodon

CWE

CWE-770

Allocation of Resources Without Limits or Throttling

{"id": "CVE-2025-27157", "cveTags": [], "metrics": {"cvssMetricV31": [{"type": "Secondary", "source": "security-advisories@github.com", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 5.3, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "LOW", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}, "impactScore": 1.4, "exploitabilityScore": 3.9}, {"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 5.3, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "LOW", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}, "impactScore": 1.4, "exploitabilityScore": 3.9}]}, "published": "2025-02-27T17:15:16.867", "references": [{"url": "https://github.com/mastodon/mastodon/commit/06f879ce9bea195344ac9f71e6799eea500628ec", "tags": ["Patch"], "source": "security-advisories@github.com"}, {"url": "https://github.com/mastodon/mastodon/security/advisories/GHSA-v39f-c9jj-8w7h", "tags": ["Vendor Advisory"], "source": "security-advisories@github.com"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Secondary", "source": "security-advisories@github.com", "description": [{"lang": "en", "value": "CWE-770"}]}], "descriptions": [{"lang": "en", "value": "Mastodon is a self-hosted, federated microblogging platform. Starting in version 4.2.0 and prior to versions 4.2.16 and 4.3.4, the rate limits are missing on `/auth/setup`. Without those rate limits, an attacker can craft requests that will send an email to an arbitrary addresses. Versions 4.2.16 and 4.3.4 fix the issue."}, {"lang": "es", "value": "Mastodon es una plataforma de microblogging federada y alojada por el usuario. A partir de la versi\u00f3n 4.2.0 y antes de las versiones 4.2.16 y 4.3.4, faltan los l\u00edmites de velocidad en `/auth/setup`. Sin esos l\u00edmites de velocidad, un atacante puede crear solicitudes que env\u00eden un correo electr\u00f3nico a direcciones arbitrarias. Las versiones 4.2.16 y 4.3.4 solucionan el problema."}], "lastModified": "2025-06-24T15:59:59.633", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:joinmastodon:mastodon:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "53633344-6503-4CB1-A5AD-3398E3819069", "versionEndExcluding": "4.2.16", "versionStartIncluding": "4.2.0"}, {"criteria": "cpe:2.3:a:joinmastodon:mastodon:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "97C4389D-7EB8-4E02-8DC8-DA1E39429AE9", "versionEndExcluding": "4.3.4", "versionStartIncluding": "4.3.0"}], "operator": "OR"}]}], "sourceIdentifier": "security-advisories@github.com"}