CVE-2026-35389 | bulwarkmail webmail up to 1.4.10 SMIME Signature Verification certificate validation

VDB-355670 · CVE-2026-35389 · GCVE-0-2026-35389 BULWARKMAIL WEBMAIL UP TO 1.4.10 SMIME SIGNATURE VERIFICATION CERTIFICATE VALIDATION HISTORYDIFFRELATEJSONXMLCTI CVSS Meta Temp Score Current Exploit Price (≈) CTI Interest Score 3.6 $0-$5k 1.03+ Summaryinfo A vulnerability classified as critical was found in bulwarkmail webmail up to 1.4.10. The impacted element is an unknown function of the component SMIME Signature Verification. Such manipulation leads to certificate validation. This vulnerability is referenced as CVE-2026-35389. It is possible to launch the attack remotely. No exploit is available. Upgrading the affected component is advised. Detailsinfo A vulnerability was found in bulwarkmail webmail up to 1.4.10. It has been rated as problematic. Affected by this issue is an unknown function of the component SMIME Signature Verification. The manipulation with an unknown input leads to a certificate validation vulnerability. Using CWE to declare the problem leads to CWE-295. The product does not validate, or incorrectly validates, a certificate. Impacted is integrity. CVE summarizes: Bulwark Webmail is a self-hosted webmail client for Stalwart Mail Server. Prior to 1.4.11, S/MIME signature verification did not validate the certificate trust chain (checkChain: false). Any email signed with a self-signed or untrusted certificate was displayed as having a valid signature. This vulnerability is fixed in 1.4.11. The advisory is available at github.com. This vulnerability is handled as CVE-2026-35389 since 04/02/2026. The exploitation is known to be difficult. The attack may be launched remotely. No form of authentication is required for exploitation. The technical details are unknown and an exploit is not available. This vulnerability is assigned to T1587.003 by the MITRE ATT&CK project. Upgrading to version 1.4.11 eliminates this vulnerability. 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/ CPE 2.3info 🔒 🔒 🔒 CPE 2.2info 🔒 🔒 🔒 CVSSv4info VulDB Vector: 🔒 VulDB Reliability: 🔍 CNA CVSS-B Score: 🔒 CNA CVSS-BT Score: 🔒 CNA Vector: 🔒 CVSSv3info VulDB Meta Base Score: 3.7 VulDB Meta Temp Score: 3.6 VulDB Base Score: 3.7 VulDB Temp Score: 3.6 VulDB Vector: 🔒 VulDB Reliability: 🔍 CVSSv2info Vector Complexity Authentication Confidentiality Integrity Availability Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock VulDB Base Score: 🔒 VulDB Temp Score: 🔒 VulDB Reliability: 🔍 Exploitinginfo Class: Certificate validation CWE: CWE-295 / CWE-287 CAPEC: 🔒 ATT&CK: 🔒 Physical: No Local: No Remote: Yes Availability: 🔒 Status: Not defined Price Prediction: 🔍 Current Price Estimation: 🔒 0-Day Unlock Unlock Unlock Unlock Today Unlock Unlock Unlock Unlock Threat Intelligenceinfo Interest: 🔍 Active Actors: 🔍 Active APT Groups: 🔍 Countermeasuresinfo Recommended: Upgrade Status: 🔍 0-Day Time: 🔒 Upgrade: webmail 1.4.11 Timelineinfo 04/02/2026 CVE reserved 04/06/2026 +4 days Advisory disclosed 04/06/2026 +0 days VulDB entry created 04/06/2026 +0 days VulDB entry last update Sourcesinfo Product: github.com Advisory: github.com Status: Confirmed CVE: CVE-2026-35389 (🔒) GCVE (CVE): GCVE-0-2026-35389 GCVE (VulDB): GCVE-100-355670 Entryinfo Created: 04/06/2026 22:41 Changes: 04/06/2026 22:41 (68) Complete: 🔍 Cache ID: 99:FF1:101 Discussion No comments yet. Languages: en. Please log in to comment. ◂ PreviousOverviewNext ▸