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Fencer Vulns
medium 5.4

CVE-2020-18671 json

Cross Site Scripting (XSS) vulnerability in Roundcube Mail <=1.4.4 via smtp config in /installer/test.php.

published 2021-06-24 5 y ago modified 2026-06-17 4 mo ago also BIT-roundcube-2020-18671 , EUVD-2020-10595

cvss
5.4
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.8%
EPSS 0.8% chance of exploitation in 30 days, percentile 57%
public exploits
0
none known

Summary

Cross Site Scripting (XSS) vulnerability in Roundcube Mail <=1.4.4 via smtp config in /installer/test.php.

Patch / fix

  • bitnami roundcube 1.4.4
  • roundcube Debian 14, Debian 13, Debian 12 1.4.5+dfsg.1-1

debian advisories DEBIAN-CVE-2020-18671

  • 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-2021:1014-1openSUSE-SU-2021:0974-1openSUSE-SU-2021:0959-1openSUSE-SU-2021:0943-1openSUSE-SU-2021:0942-1openSUSE-SU-2021:0931-1

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-2020-18671 updated cvss 7.2

roundcubemail: XSS via smtp config in /installer/test.php

  • 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

Exploit prediction

0.82% chance of exploitation in the next 30 days, higher than 57% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • lorexxar.cn https://lorexxar.cn/2020/06/10/roundcube-mail-xss/#store-xss-in-smtp-config referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.1 5.4 CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
NVD 2.0 3.5 AV:N/AC:M/Au:S/C:N/I:P/A:N
OSV 3.1 5.4 CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

Affected packages

ecosystem package affected fixed in
bitnami roundcube
<1.4.4
1.4.4

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.