CVE-2026-35390 | bulwarkmail webmail up to 1.4.10 Email Content-Security-Policy-Report-Only cross site scripting

VDB-355671 · CVE-2026-35390 · GCVE-0-2026-35390 BULWARKMAIL WEBMAIL UP TO 1.4.10 EMAIL CONTENT-SECURITY-POLICY-REPORT-ONLY CROSS SITE SCRIPTING HISTORYDIFFRELATEJSONXMLCTI CVSS Meta Temp Score Current Exploit Price (≈) CTI Interest Score 4.1 $0-$5k 1.38+ Summaryinfo A vulnerability, which was classified as problematic, has been found in bulwarkmail webmail up to 1.4.10. This affects an unknown function of the component Email Handler. Performing a manipulation of the argument Content-Security-Policy-Report-Only results in cross site scripting. This vulnerability is identified as CVE-2026-35390. The attack can be initiated remotely. There is not any exploit available. It is advisable to upgrade the affected component. Detailsinfo A vulnerability classified as problematic has been found in bulwarkmail webmail up to 1.4.10. This affects an unknown functionality of the component Email Handler. The manipulation of the argument Content-Security-Policy-Report-Only with an unknown input leads to a cross site scripting vulnerability. CWE is classifying the issue as CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. This is going to have an impact on integrity. The summary by CVE is: 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. It is possible to read the advisory at github.com. This vulnerability is uniquely identified as CVE-2026-35390 since 04/02/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. It demands that the victim is doing some kind of user interaction. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1059.007 according to MITRE ATT&CK. 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: 4.3 VulDB Meta Temp Score: 4.1 VulDB Base Score: 4.3 VulDB Temp Score: 4.1 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: Cross site scripting CWE: CWE-79 / CWE-94 / CWE-74 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-2026-35390 (🔒) GCVE (CVE): GCVE-0-2026-35390 GCVE (VulDB): GCVE-100-355671 Entryinfo Created: 04/06/2026 22:41 Changes: 04/06/2026 22:41 (69) Complete: 🔍 Cache ID: 99:A6B:101 Discussion No comments yet. Languages: en. Please log in to comment. ◂ PreviousOverviewNext ▸