PT-2026-30729 · Unknown · Stalwart Mail Server+1

Richardweinberger · CVE-2026-35391 · Published 2026-04-06 · Updated 2026-04-06

Positive Technologies (AI Summary)

CVSS v4.0

8.7

High

Base vector

AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N

Name of the Vulnerable Software and Affected Versions Bulwark Webmail versions prior to 1.4.11

Description Bulwark Webmail, a self-hosted webmail client for Stalwart Mail Server, is affected by an issue where the getClientIP() function in lib/admin/session.ts incorrectly trusts the first entry in the X-Forwarded-For header. This allows attackers to forge their source IP address, potentially bypassing IP-based rate limiting and forging audit log entries. The X-Forwarded-For header is fully controlled by the client.

Recommendations Update to Bulwark Webmail version 1.4.11 or later.

Exploit

Fix

Weakness Enumeration

CWE-348

Related Identifiers

CVE-2026-35391

GHSA-7PJ2-232X-6698

Affected Products

Bulwark Webmail

Stalwart Mail Server

References · 6

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/35xxx/CVE-2026-35391.json · Exploit
• https://github.com/bulwarkmail/webmail/security/advisories/GHSA-7pj2-232x-6698 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-35391 · Security Note
• https://osv.dev/vulnerability/CVE-2026-35391 · Vendor Advisory
• https://twitter.com/CVEnew/status/2041260647426716001 · Twitter Post
• https://twitter.com/infoflowcloud/status/2041261094929387595 · Twitter Post