Skip to content
Fencer Intel
medium 6.1

CVE-2020-35730 kev in the critical feed json

An XSS issue was discovered in Roundcube Webmail before 1.2.13, 1.3.x before 1.3.16, and 1.4.x before 1.4.10.

published 5y ago modified 4mo ago also BIT-roundcube-2020-35730 , EUVD-2020-23386

cvss
6.1
version 3.1, CNA
cisa kev
Exploited
added 2023-06-22
epss
32.9%
EPSS 32.9% chance of exploitation in 30 days, percentile 98%
public exploits
0
none known

Summary

An XSS issue was discovered in Roundcube Webmail before 1.2.13, 1.3.x before 1.3.16, and 1.4.x before 1.4.10. The attacker can send a plain text e-mail message, with JavaScript in a link reference element that is mishandled by linkref_addindex in rcube_string_replacer.php.

Patch / fix

cisa required action Apply updates per vendor instructions.

  • bitnami roundcube 1.2.13, 1.3.16, 1.4.10
  • roundcube webmail 1.2.13, 1.3.16, 1.4.10
  • roundcube Debian 14, Debian 13, Debian 12 1.4.10+dfsg.1-1

debian advisories DEBIAN-CVE-2020-35730

  • roundcube Ubuntu Pro 16.04 LTS 1.2~beta+dfsg.1-0ubuntu1+esm2
  • roundcube Ubuntu Pro 18.04 LTS 1.3.6+dfsg.1-1ubuntu0.1~esm2
  • roundcube Ubuntu Pro 20.04 LTS 1.4.3+dfsg.1-1ubuntu0.1~esm2

ubuntu advisories UBUNTU-CVE-2020-35730

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • roundcubemail openSUSE Tumbleweed 1.4.11-1.3
  • roundcubemail Package Hub 15 SP4, Package Hub 15 SP3, openSUSE Leap 15.4 +1 more 1.5.3-bp154.2.3.1
  • roundcubemail Package Hub 15 SP2 1.3.16-bp152.4.18.1
  • roundcubemail Package Hub 15 SP2 1.3.16-bp152.4.14.1
  • roundcubemail Package Hub 15 SP2 1.3.16-bp152.4.10.1
  • roundcubemail Package Hub 15 SP1 1.3.16-bp151.4.6.1
  • roundcubemail Package Hub 15 SP2 1.3.16-bp152.4.6.1
  • roundcubemail openSUSE Leap 15.2 1.3.16-lp152.4.6.1

opensuse advisories openSUSE-SU-2024:11303-1openSUSE-SU-2022:10148-1openSUSE-SU-2021:1014-1openSUSE-SU-2021:0974-1openSUSE-SU-2021:0959-1openSUSE-SU-2021:0943-1

  • roundcubemail Arch Linux 1.4.10-1

arch linux advisories AVG-1388

Is CVE-2020-35730 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

Check with Fencer

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2020-35730 updated cvss 7.2

roundcubemail: XSS via HTML or plain text messages with malicious content

  • Red Hat All currently supported Red Hat products
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Timeline

  1. Published
  2. Added to CISA KEV
  3. CISA patch deadline
  4. CISA SSVC: exploitation active

Known exploited

Added
3y ago
Patch by
2023-07-13 (3y ago)
Ransomware
Not known
Required action
Apply updates per vendor instructions.
Vendor, product
Roundcube, Roundcube Webmail
CISA name
Roundcube Webmail Cross-Site Scripting (XSS) Vulnerability

CISA SSVC

Exploitation
Active, exploited in the wild
Automatable
no
Technical impact
partial
Assessed
last yr.

Exploit prediction

32.92% chance of exploitation in the next 30 days, higher than 98% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
CISA ADP 3.1 6.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
NVD 3.1 6.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
CNA 3.1 6.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
NVD 2.0 4.3 AV:N/AC:M/Au:N/C:N/I:P/A:N
OSV 3.1 6.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Affected packages

ecosystem package affected fixed in
bitnami roundcube
<1.2.13
>=1.3.0, <1.3.16
>=1.4.0, <1.4.10
1.2.13
1.3.16
1.4.10

Classification

Weakness
  • CWE-79 Improper Neutralization of Input During Web Page Generation

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.