CVE Watch20 oct 2026

CVE-2026-113728

Bulwark Webmail is a self-hosted webmail client for Stalwart Mail Server. Prior to 1.9.2, the unauthenticated POST /api/fetch-ical endpoint

CVSS

7.5

Alto

EPSS

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KEV

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Exploit Today

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0-100

Publicado: 20 oct 2026 · Última mod.: 20 oct 2026 · CWE-918

EPSS · 30d

Sin historial EPSS suficiente todavía.

Descripción técnica

Bulwark Webmail is a self-hosted webmail client for Stalwart Mail Server. Prior to 1.9.2, the unauthenticated POST /api/fetch-ical endpoint validates a caller-supplied hostname with one DNS lookup and then passes the URL to fetch, which performs a separate lookup for the socket connection. An attacker controlling authoritative DNS can return a public address during validation and then rebind the hostname to a loopback, private, link-local, or cloud metadata address for the connection, causing the server to return up to 10 MB of an internal HTTP or HTTPS response. The same check-then-fetch pattern also existed in authenticated JMAP login and TOTP token-exchange flows. This issue is fixed in version 1.9.2.

Referencias oficiales

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