CVE-2026-34834: high-severity vulnerability in bulwarkmail webmail
Bulwark Webmail: Authentication Bypass in verifyIdentity() due to missing cookie validation
Published · Updated
E-mail alert when it lands in KEV, gets a public PoC or its score goes up.
21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 8.7epss 0.3%
Bulwark Webmail is a self-hosted webmail client for Stalwart Mail Server. Prior to version 1.4.10, the verifyIdentity() function contained logic that returned true if no session cookies were present. This allowed unauthenticated attackers to bypass security checks and access/modify user settings via the /api/settings endpoint by providing arbitrary headers. This issue has been patched in version 1.4.10.
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
Affected products
bulwarkmail · webmailRelated CVEs — bulwarkmail webmail
In the same product, most dangerous first.
CVE-2026-113728HIGHBulwark Webmail: DNS-rebinding SSRF in public iCalendar fetch endpointEPSS 0.5%CVE-2026-35389HIGHBulwark Webmail S/MIME signature verification accepted self-signed certificatesEPSS 0.2%CVE-2026-35390MEDIUMContent-Security-Policy was set to Report-Only mode, failing to block XSS attacksEPSS 0.2%CVE-2026-34833HIGHBulwark Webmail: Information Exposure: password returned in /api/auth/sessionEPSS 0.2%CVE-2026-35391HIGHBulwark Webmail getClientIP() trusted client-controlled X-Forwarded-For value, enabling rate limit bypass and audit log forgeryEPSS 0.1%