bulwarkmail webmail up to 1.4.10 X-Forwarded-For lib/admin/session.ts getClientIP less trusted source

Summaryinfo

A vulnerability was found in bulwarkmail webmail up to 1.4.10. It has been rated as problematic. Affected by this vulnerability is the function getClientIP in the library lib/admin/session.ts of the component X-Forwarded-For Handler. This manipulation causes less trusted source. This vulnerability appears as CVE-2026-35391. The attack may be initiated remotely. There is no available exploit. Upgrading the affected component is advised.

Detailsinfo

A vulnerability classified as problematic was found in bulwarkmail webmail up to 1.4.10. Affected by this vulnerability is the function getClientIP in the library lib/admin/session.ts of the component X-Forwarded-For Handler. The manipulation with an unknown input leads to a less trusted source vulnerability. The CWE definition for the vulnerability is CWE-348. The product has two different sources of the same data or information, but it uses the source that has less support for verification, is less trusted, or is less resistant to attack. As an impact it is known to affect integrity. The summary by CVE is:

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.

It is possible to read the advisory at github.com. This vulnerability is known as CVE-2026-35391 since 04/02/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details of the vulnerability are known, but there is no available exploit.

Upgrading to version 1.4.11 eliminates this vulnerability.

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Productinfo

Type

• Mail Client Software

Vendor

• bulwarkmail

Name

• webmail

Version

• 1.4.0
• 1.4.1
• 1.4.2
• 1.4.3
• 1.4.4
• 1.4.5
• 1.4.6
• 1.4.7
• 1.4.8
• 1.4.9
• 1.4.10

Website

• Product: https://github.com/bulwarkmail/webmail/

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