CVE-2026-34834— Bulwark Webmail: Authentication Bypass in verifyIdentity() due to missing cookie validation
Quick assessment
Affected
bulwarkmail webmail
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
Bulwark Webmail是Bulwark Mail开源的一个自托管网页邮件客户端。 Bulwark Webmail 1.4.10之前版本存在授权问题漏洞，该漏洞源于verifyIdentity函数在无会话Cookie时返回true的逻辑问题，可能导致未经验证的攻击者绕过安全检查。
Possible ATT&CK Techniques 1 AI
T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-34834
Vulnerability Information
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Vulnerability Title
Bulwark Webmail: Authentication Bypass in verifyIdentity() due to missing cookie validation
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
认证机制不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Bulwark Webmail 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Bulwark Webmail是Bulwark Mail开源的一个自托管网页邮件客户端。 Bulwark Webmail 1.4.10之前版本存在授权问题漏洞，该漏洞源于verifyIdentity函数在无会话Cookie时返回true的逻辑问题，可能导致未经验证的攻击者绕过安全检查。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| bulwarkmail | webmail | < 1.4.10 | - |
|
II. Public POCs for CVE-2026-34834
| # | POC Description | Source Link | Shenlong Link |
|---|
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Vendor Advisories for CVE-2026-34834 (1)
Vendor Pages for CVE-2026-34834 (1)
IV. Related Vulnerabilities
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V. Comments for CVE-2026-34834
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