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Fencer Vulns
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 2020-12-28 5 y ago modified 2026-06-17 4 mo 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

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
3 y ago
Patch by
2023-07-13 (3 y 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
21 mo ago

Exploit prediction

32.92% chance of exploitation in the next 30 days, higher than 98% of all scored CVEs (FIRST EPSS, 2026-11-08).

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 Vulns 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.