XSS in Icewarp Mail Server

CVE-2025-40632

Cross-site scripting (XSS) in Icewarp Mail Server affecting version 11.4.0. This vulnerability allows an attacker to modify the “lastLogin” cookie with malicious JavaScript code that will be executed when the page is rendered.

Vulnerability class: XSS (Cross-Site Scripting)

Published · last modified .

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.002 (10.8th percentile), scored .

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 11th percentile — 10.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS trend (30 days)EPSS over the last 30 days for CVE-2025-40632: held from 0.002 to 0.002.

EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: 0.000

Affected products

Weakness classification (CWE)

Public proof-of-concept exploits

References

Frequently asked questions

What is CVE-2025-40632?
CVE-2025-40632 is a medium-severity vulnerability in Icewarp Mail Server, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2025-05-16.
How severe is CVE-2025-40632?
Medium severity. CVSS v3 base score is 6.1 out of 10.
Is CVE-2025-40632 known to be exploited?
1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.