What is CVE-2010-5338?

CVE-2010-5338 is a medium-severity vulnerability in Icewarp Webclient, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2019-10-11.

How severe is CVE-2010-5338?

Medium severity. CVSS v3 base score is 6.1 out of 10.

Is CVE-2010-5338 known to be exploited?

2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

XSS in Icewarp Webclient

CVE-2010-5338

IceWarp Webclient before 10.2.1 has XSS via an HTTP POST request: webmail/basic/ with the parameter _dlg[captcha][action] is non-persistent in 10.1.3 and 10.2.0.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2019-10-11 · last modified 2026-06-16.

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: 0.008 (56.1th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 56th percentile — 56.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.008 · newest: 0.008 · change: 0.000

Affected products

Icewarp Webclient

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

Public proof-of-concept exploits

References

www.gosecurity.ch/component/content/article/12-services/gosecuritynews/facharti… (Third Party Advisory)
vuldb.com/ (Permissions Required, Third Party Advisory)

Frequently asked questions

What is CVE-2010-5338?: CVE-2010-5338 is a medium-severity vulnerability in Icewarp Webclient, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2019-10-11.
How severe is CVE-2010-5338?: Medium severity. CVSS v3 base score is 6.1 out of 10.
Is CVE-2010-5338 known to be exploited?: 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.