CVE-2020-13965

MEDIUM KEV

Roundcube Webmail < 1.3.12 and 1.4.x < 1.4.5 - Stored Cross-Site Scripting via XML Attachment Preview

Title source: llm

Exploitation Summary

CVE-2020-13965 is actively exploited and listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added June 26, 2024. EIP tracks 1 public exploit from researchers including mbadanoiu.

AI-analyzed exploit summary This repository contains a writeup for CVE-2020-13965, an XSS vulnerability in Roundcube Webmail. The vulnerability allows arbitrary JavaScript execution via a malicious XML attachment, bypassing the script filter when previewed or clicked.

Description

An issue was discovered in Roundcube Webmail before 1.3.12 and 1.4.x before 1.4.5. There is XSS via a malicious XML attachment because text/xml is among the allowed types for a preview.

Exploits (1)

nomisec WRITEUP

by mbadanoiu · poc

https://github.com/mbadanoiu/CVE-2020-13965

View Code ZIP pw:eip

This repository contains a writeup for CVE-2020-13965, an XSS vulnerability in Roundcube Webmail. The vulnerability allows arbitrary JavaScript execution via a malicious XML attachment, bypassing the script filter when previewed or clicked.

Classification

Writeup 90%

Attack Type

Xss

Complexity

Moderate

Reliability

Reliable

Target: Roundcube Webmail before 1.4.5 and 1.3.12

Auth required

Prerequisites: Victim interaction (opening the malicious attachment)

MITRE ATT&CK

T1189 - Drive-by Compromise

devstral-2 · analyzed Feb 16, 2026 Full analysis →

References (10)

Core 10

Core References

Release Notes x_refsource_misc

https://github.com/roundcube/roundcubemail/releases/tag/1.4.5

Release Notes x_refsource_misc

https://github.com/roundcube/roundcubemail/releases/tag/1.3.12

Patch, Third Party Advisory x_refsource_misc

https://github.com/roundcube/roundcubemail/commit/884eb611627ef2bd5a2e20e02009ebb1eceecdc3

View Patch ZIP pw:eip

Patch x_refsource_misc

https://github.com/roundcube/roundcubemail/compare/1.4.4...1.4.5

Vendor Advisory x_refsource_confirm

https://roundcube.net/news/2020/06/02/security-updates-1.4.5-and-1.3.12

Third Party Advisory vendor-advisory x_refsource_debian

https://www.debian.org/security/2020/dsa-4700

Mailing List vendor-advisory x_refsource_fedora

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DLESQ4LPJGMSWHQ4TBRTVQRDG7IXAZCW/

Mailing List vendor-advisory x_refsource_fedora

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ODPJXBHZ32QSP4MYT2OBCALYXSUJ47SK/

Exploit, Third Party Advisory x_refsource_misc

https://github.com/DrunkenShells/Disclosures/tree/master/CVE-2020-13965-Cross%20Site-Scripting%20via%20Malicious%20XML%20Attachment-Roundcube

US Government Resource

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-13965

Scores

CVSS v3 6.1

EPSS 0.7182

EPSS Percentile 98.8%

Attack Vector NETWORK

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

CISA SSVC

Vulnrichment

Exploitation active

Automatable no

Technical Impact partial

Details

CISA KEV 2024-06-26

VulnCheck KEV 2024-06-26

InTheWild.io 2024-06-26

ENISA EUVD EUVD-2020-6139

CWE

CWE-80 CWE-79

Status published

Products (5)

debian/debian_linux 9.0

debian/debian_linux 10.0

fedoraproject/fedora 31

fedoraproject/fedora 32

roundcube/webmail < 1.3.12

Published Jun 09, 2020

KEV Added Jun 26, 2024

Tracked Since Feb 18, 2026