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CVE-2026-34833— Bulwark Webmail: Information Exposure: password returned in /api/auth/session

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之前版本存在安全漏洞，该漏洞源于GET /api/auth/session端点曾在JSON响应中包含用户明文密码，可能导致凭据泄露。

AI Predicted 7.5 Difficulty: Trivial EPSS 0.27% · P18

Possible ATT&CK Techniques 1 AI

T1530 · Data from Cloud Storage
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I. Basic Information for CVE-2026-34833

Vulnerability Information
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Vulnerability Title
Bulwark Webmail: Information Exposure: password returned in /api/auth/session
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 GET /api/auth/session endpoint previously included the user's plaintext password in the JSON response. This exposed credentials to browser logs, local caches, and network proxie. 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:H/VI:N/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
敏感数据的明文存储
Source: CVE Program / CVE List V5
Vulnerability Title
Bulwark Webmail 安全漏洞
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之前版本存在安全漏洞，该漏洞源于GET /api/auth/session端点曾在JSON响应中包含用户明文密码，可能导致凭据泄露。
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-2026-34833

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III. Intelligence Information for CVE-2026-34833

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Vendor Advisories for CVE-2026-34833 (1)

Vendor Pages for CVE-2026-34833 (1)

IV. Related Vulnerabilities

Same product: webmail
Same vendor: bulwarkmail
Same weakness: CWE-312

V. Comments for CVE-2026-34833

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