Mastodon e‑mail throttle misconfiguration allows unlimited email confirmations against unconfirmed emails_CVE-2025-54879

{
    "lastseen": "",
    "description": "Mastodon is a free, open-source social network server based on ActivityPub Mastodon which facilitates LDAP configuration for authentication. In versions 3.1.5 through 4.2.24, 4.3.0 through 4.3.11 and 4.4.0 through 4.4.3, Mastodon's rate-limiting system has a critical configuration error where the email-based throttle for confirmation emails incorrectly checks the password reset path instead of the confirmation path, effectively disabling per-email limits for confirmation requests. This allows attackers to bypass rate limits by rotating IP addresses and send unlimited confirmation emails to any email address, as only a weak IP-based throttle (25 requests per 5 minutes) remains active. The vulnerability enables denial-of-service attacks that can overwhelm mail queues and facilitate user harassment through confirmation email spam. This is fixed in versions 4.2.24, 4.3.11 and 4.4.3.",
    "published": "2025-08-05T23:39:59.130Z",
    "modified": "2025-08-06T20:32:56.740Z",
    "type": "cve",
    "title": "Mastodon e\u2011mail throttle misconfiguration allows unlimited email confirmations against unconfirmed emails",
    "source": "GitHub_M",
    "references": "https://github.com/mastodon/mastodon/security/advisories/GHSA-84ch-6436-c7mg\nhttps://github.com/mastodon/mastodon/commit/e2592419d93fb41be03c2f3ff6a122fecb0e0952\nhttps://github.com/mastodon/mastodon/releases/tag/v4.4.3",
    "id": "CVE-2025-54879",
    "bulletinFamily": "",
    "cwe": [
        "CWE-770"
    ],
    "cvelist": null,
    "sourceData": "mastodon mastodon >= 3.1.5, < 4.2.24\nmastodon mastodon >= 4.3.0, < 4.3.11\nmastodon mastodon >= 4.4.0, < 4.4.3",
    "sourceHref": "",
    "cvss": {
        "score": 5.3,
        "severity": "MEDIUM",
        "vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
        "version": "3.1"
    },
    "cvss2": [],
    "cvss3": {
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        "baseScore": 0,
        "baseSeverity": "",
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        "attackComplexity": "",
        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
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        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "mastodon",
    "version": ">= 3.1.5, < 4.2.24",
    "vendor": "mastodon",
    "ai_description": "",
    "ai_severity": "",
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    "ai_score": 0
}