Is CVE-2026-35390 actively exploited?

CVE-2026-35390 has no public evidence of in-the-wild exploitation as of 2026-04-09.

What is the CVSS score for CVE-2026-35390?

CVE-2026-35390 has a CVSS score of 5.3 (MEDIUM severity). Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X.

How do I patch CVE-2026-35390?

Patch guidance is available from bulwarkmail security advisories. CVEDatabase generates AI-assisted remediation guidance on demand for CVE-2026-35390.

Which products are affected by CVE-2026-35390?

1 product: bulwarkmail webmail.

CVE-2026-35390 - remediation guidance & executive summary

Description

Bulwark Webmail is a self-hosted webmail client for Stalwart Mail Server. Prior to 1.4.11, the reverse proxy (proxy.ts) set the Content-Security-Policy-Report-Only header instead of the enforcing Content-Security-Policy header. This means cross-site scripting (XSS) attacks were logged but not blocked. Any user who could inject script content (e.g., via crafted email HTML) could execute arbitrary JavaScript in the context of the application, potentially stealing session tokens or performing actions on behalf of the user. This vulnerability is fixed in 1.4.11.

CVSS Metrics

Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector: network
Complexity: low
Privileges: none
User Action: passive
Confidentiality: undefined
Integrity: undefined
Availability: undefined
Weaknesses: CWE-79 · Cross-site Scripting (XSS)

Metadata

Primary Vendor: BULWARKMAIL
Published: 4/6/2026
Last Modified: 4/9/2026
Source: NIST NVD
Note: Verify all details with official vendor sources before applying patches.

CVE-2026-35390

Description

CVSS Metrics

Metadata

Affected Products

Remediation Guidance

Executive Summary