What is CVE-2026-34833?

CVE-2026-34833 is a high-severity vulnerability in Bulwarkmail Webmail, classified under Cleartext Storage of Sensitive Information. CVSS score: 7.5/10. Published 2026-04-02.

How severe is CVE-2026-34833?

High severity. CVSS v3 base score is 7.5 out of 10.

Vulnerability in Bulwarkmail Webmail

CVE-2026-34833

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.

Published 2026-04-02 · last modified 2026-07-24.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.003 (17.2th percentile), scored 2026-10-01.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 17th percentile — 17.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.002 · newest: 0.003 · change: +0.001

Affected products

Bulwarkmail Webmail — versions < 1.4.10

Weakness classification (CWE)

CWE-312 — Cleartext Storage of Sensitive Information

References

github.com/bulwarkmail/webmail/security/advisories/GHSA-47pm-883h-885r (Vendor Advisory)
github.com/bulwarkmail/webmail/releases/tag/1.4.10 (Product)

Frequently asked questions

What is CVE-2026-34833?: CVE-2026-34833 is a high-severity vulnerability in Bulwarkmail Webmail, classified under Cleartext Storage of Sensitive Information. CVSS score: 7.5/10. Published 2026-04-02.
How severe is CVE-2026-34833?: High severity. CVSS v3 base score is 7.5 out of 10.