What is CVE-2013-4109?

CVE-2013-4109 is a medium-severity vulnerability in Cryptocat Message Handling, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2019-11-14.

How severe is CVE-2013-4109?

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

XSS in Cryptocat Message Handling

CVE-2013-4109

An unspecified cross-site scripting (XSS) vulnerability exists in Cryptocat Message Handling 1.1.165.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2019-11-14 · 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: 0.017 (76.4th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 76th percentile — 76.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.017 · newest: 0.017 · change: 0.000

Affected products

Cryptocat Message Handling — versions 1.1.165
Cryptocat Project — versions 1.1.165

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

www.openwall.com/lists/oss-security/2013/07/10/15 (Mailing List, Third Party Advisory)
tobtu.com/decryptocat.php (Vendor Advisory)
www.securityfocus.com/bid/61097 (VDB Entry, Third Party Advisory)
vuldb.com/es/ (Permissions Required, Third Party Advisory)

Frequently asked questions

What is CVE-2013-4109?: CVE-2013-4109 is a medium-severity vulnerability in Cryptocat Message Handling, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2019-11-14.
How severe is CVE-2013-4109?: Medium severity. CVSS v3 base score is 6.1 out of 10.