Which products and versions are affected by CVE-2020-13965?

Affected: Webmail (Roundcube); Debian Linux versions 10.0, 9.0; Fedora (Fedoraproject) versions 31, 32, among others. The full list is in the CVE brief.

Is CVE-2020-13965 being exploited in the wild?

It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Jun 26, 2024.

Is CVE-2020-13965 in the CISA KEV catalog?

Yes. It was added on Jun 26, 2024 with a federal remediation due date of Jul 17, 2024.

Is there a public exploit for CVE-2020-13965?

Public exploit code is available.

Is there a fix for CVE-2020-13965?

Fixed versions are available, including roundcube 1.2.3+dfsg.1-4+deb9u5, roundcube 1.2~beta+dfsg.1-0ubuntu1+esm2, roundcube 1.3.12.

How urgently should CVE-2020-13965 be patched?

Brandefense priority: patch immediately, because it is listed as exploited in the wild.

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Vulnerability Intelligence

CVE-2020-13965

MediumExploitedPublic exploit

There is XSS via a malicious XML attachment because text/xml is among the allowed types for a preview.

Published Jun 9, 2020 · Updated Sep 17, 2026 · Also known as BIT-roundcube-2020-13965, DEBIAN-CVE-2020-13965, UBUNTU-CVE-2020-13965

Key Facts

Patch immediately

CVE-2020-13965 is a medium-severity vulnerability (CVSS 6.3 v3.1) affecting Webmail (Roundcube), Debian Linux, Fedora (Fedoraproject) and 1 more product.
It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Jun 26, 2024. Public exploit code is available.
EPSS estimates a 77% probability of exploitation in the next 30 days.
Fixed versions are available, including roundcube 1.2.3+dfsg.1-4+deb9u5, roundcube 1.2~beta+dfsg.1-0ubuntu1+esm2, roundcube 1.3.12.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.

CVSS v3.1

6.3

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

EPSS (30-day exploit likelihood)

77%

Higher than 99.5% of all scored CVEs

Exploited in the wild

Yes

4 catalog listings

Public exploit code

Available

Proof-of-concept or weaponized module

Get the full CVE-2020-13965 brief as a PDF

Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.

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.

Known-Exploited Catalog Listings

Catalog	Added	Remediation due	Ransomware use
CISA KEV	Jun 26, 2024	Jul 17, 2024	Not reported
Industry KEV feed	Jun 26, 2024	Jul 17, 2024	Not reported
CIRCL KEV	Jun 26, 2024	Jul 17, 2024	Not reported
ENISA EUVD	Jun 26, 2024	n/a	Not reported

Required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

Affected Products

24 affected entries in total

Product	Affected versions	Fixed in
WebmailRoundcube	See advisory	1.3.12
Debian LinuxDebian	10.0, 9.0	n/a
FedoraFedoraproject	31, 32	n/a
roundcubebitnami	See advisory	1.3.12

Patched Releases

roundcube

1.2.3+dfsg.1-4+deb9u5, 1.2~beta+dfsg.1-0ubuntu1+esm2, 1.3.12, 1.3.13+dfsg.1-1~deb10u1, 1.3.6+dfsg.1-1ubuntu0.1~esm2, 1.4.3+dfsg.1-1ubuntu0.1~esm1, 1.4.3+dfsg.1-1ubuntu0.1~esm2, 1.4.5, 1.4.5+dfsg.1-1, 1.5.0+dfsg.1-2ubuntu0.1~esm1

Webmail

1.3.12

Timeline

Publicly disclosed
Jun 9, 2020
Added to CISA KEV
Jun 26, 2024
Added to Industry KEV feed
Jun 26, 2024
Added to CIRCL KEV
Jun 26, 2024
Added to ENISA EUVD
Jun 26, 2024
Last updated
Sep 17, 2026

Weakness Type

CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CWE-80 Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS)

References

15 more references in the full CVE brief

FAQ

Common Questions.

An issue was discovered in Roundcube Webmail before 1.3.12 and 1.4.x before 1.4.5.
Affected: Webmail (Roundcube); Debian Linux versions 10.0, 9.0; Fedora (Fedoraproject) versions 31, 32, among others. The full list is in the CVE brief.
It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Jun 26, 2024.
Yes. It was added on Jun 26, 2024 with a federal remediation due date of Jul 17, 2024.
Public exploit code is available.
Fixed versions are available, including roundcube 1.2.3+dfsg.1-4+deb9u5, roundcube 1.2~beta+dfsg.1-0ubuntu1+esm2, roundcube 1.3.12.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.

Is CVE-2020-13965 Running On Your Attack Surface?

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