CVE-2026-35391
7.5 · HIGHOverview
CVE-2026-35391 is a high-severity vulnerability affecting bulwarkmail webmail. It was published on April 6, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).
This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
Technical Description
Bulwark Webmail is a self-hosted webmail client for Stalwart Mail Server. Prior to 1.4.11, the getClientIP() function in lib/admin/session.ts trusted the first (leftmost) entry of the X-Forwarded-For header, which is fully controlled by the client. An attacker could forge their source IP address to bypass IP-based rate limiting (enabling brute-force attacks against the admin login) or forge audit log entries (making malicious activity appear to originate from arbitrary IP addresses). This vulnerability is fixed in 1.4.11.
Remediation
Check the references section for vendor advisories and patches from bulwarkmail. Update webmail to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
Affected Products
| Vendor | Product | Versions | Status |
|---|---|---|---|
| bulwarkmail | webmail | >= 0, < 1.4.11 | Affected |
Frequently Asked Questions
What is CVE-2026-35391?
CVE-2026-35391 is a high-severity vulnerability affecting bulwarkmail webmail. It was published on April 6, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).
How severe is CVE-2026-35391?
This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
How do I fix or remediate CVE-2026-35391?
Check the references section for vendor advisories and patches from bulwarkmail. Update webmail to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
How can CyberStrike help with CVE-2026-35391?
CyberStrike's AI-powered security agents can automatically detect CVE-2026-35391 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.
How CyberStrike Helps
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