HOMEVULNERABILITIESCVE-2026-35389
HIGH

CVE-2026-35389

CWE-295Published: April 6, 2026· Updated: Apr 9, 2026

7.5
CVSS v3.1
EPSS:0.02%probability of exploitation in 30 daysPercentile:6.2th

Official Description

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.

NVD Source

Technical Analysis

CVE-2026-35389 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in full integrity compromise (data manipulation), with a CVSS base score of 7.5.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityNone
IntegrityHigh
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Affected Vendors & Products

bulwarkmail1 product
webmail
Source: NVD CPE · 1 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

ADVISORYhttps://github.com/bulwarkmail/webmail/security/advisories/GHSA-v6w6-338p-p256

All References (1)

→
https://github.com/bulwarkmail/webmail/security/advisories/GHSA-v6w6-338p-p256Vendor Advisory

Quick Facts

CVE IDCVE-2026-35389
CVSS Score7.5 / 10
SeverityHIGH
WeaknessCWE-295
CISA KEVNo
EPSS (30d)0.02%
Affected1 vendor
PublishedApr 6, 2026

Related CVEs (CWE-295)

CVE-2026-4370
10.0
CVE-2026-20184
9.8
CVE-2026-9258
9.8
CVE-2026-9259
9.8
CVE-2025-15573
9.4
CVE-2026-5194
9.3

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2026-35389 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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