Mailpit Vulnerable to Server-Side Request Forgery (SSRF) via HTML Check API_CVE-2026-23845

{
    "lastseen": "",
    "description": "Mailpit is an email testing tool and API for developers. Versions prior to 1.28.3 are vulnerable to Server-Side Request Forgery (SSRF) via HTML Check CSS Download. The HTML Check feature (`/api/v1/message/{ID}/html-check`) is designed to analyze HTML emails for compatibility. During this process, the `inlineRemoteCSS()` function automatically downloads CSS files from external `<link rel=\"stylesheet\" href=\"...\">` tags to inline them for testing. Version 1.28.3 fixes the issue.",
    "published": "2026-01-19T19:01:38.163Z",
    "modified": "2026-01-19T19:01:38.163Z",
    "type": "cve",
    "title": "Mailpit Vulnerable to Server-Side Request Forgery (SSRF) via HTML Check API",
    "source": "GitHub_M",
    "references": "https://github.com/axllent/mailpit/security/advisories/GHSA-6jxm-fv7w-rw5j\nhttps://github.com/axllent/mailpit/commit/1679a0aba592ebc8487a996d37fea8318c984dfe\nhttps://github.com/axllent/mailpit/releases/tag/v1.28.3",
    "id": "CVE-2026-23845",
    "bulletinFamily": "",
    "cwe": [
        "CWE-918"
    ],
    "cvelist": null,
    "sourceData": "axllent mailpit < 1.28.3",
    "sourceHref": "",
    "cvss": {
        "score": 5.8,
        "severity": "MEDIUM",
        "vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N",
        "version": "3.1"
    },
    "cvss2": [],
    "cvss3": {
        "version": "",
        "vectorString": "",
        "baseScore": 0,
        "baseSeverity": "",
        "attackVector": "",
        "attackComplexity": "",
        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
            "version": "",
            "vectorString": "",
            "baseScore": 0,
            "baseSeverity": "",
            "attackVector": "",
            "attackComplexity": "",
            "privilegesRequired": "",
            "userInteraction": "",
            "scope": "",
            "confidentialityImpact": "",
            "integrityImpact": "",
            "availabilityImpact": ""
        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "mailpit",
    "version": "< 1.28.3",
    "vendor": "axllent",
    "ai_description": "",
    "ai_severity": "",
    "ai_vendor": "",
    "ai_product": "",
    "ai_version": "",
    "ai_score": 0
}