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Security Digest · Vulnerability record · Known exploited

CVE-2020-13965: Roundcube Webmail Cross-Site Scripting (XSS) Vulnerability

Exploited in the wild (CISA KEV). An issue was discovered in Roundcube Webmail before 1.3.12 and 1.4.x before 1.4.5.

CISA KEV · added 2024-06-26 CVSS 6.3 Medium EPSS 76.6% · p99.5

Updated By erroneo.us Security Desk12 references Seen in the digest for Jun 26, 2024

Should you act?

Exploited: patch now if you run it

CISA has confirmed exploitation in the wild. This signal is computed from CISA KEV, EPSS and CVSS data; it is not an editorial verdict.

  • Yes, if you run Roundcube Webmail. CISA added this CVE to its Known Exploited Vulnerabilities catalog on 2024-06-26, which means there is reliable evidence of exploitation in the wild. US federal agencies must remediate by 2024-07-17; treat that as the outer limit, not the target.
  • EPSS 76.6%, percentile 99.5: FIRST’s model estimates a 76.6% chance of exploitation activity in the next 30 days, higher than 99.5% of all scored CVEs (very high). EPSS is a probability, not a verdict.
  • Needs a user to click or open something. Phishing makes that realistic, but it is not wormable.

What it is

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.

CISA’s summary

Roundcube Webmail contains a cross-site scripting (XSS) vulnerability that allows a remote attacker to manipulate data via a malicious XML attachment.

Weakness type: CWE-80.

Product: Roundcube Webmail · Assigned by: mitre · Published: 2020-06-09

Affected and fixed versions

VendorProductAffected versions (per CVE record)
n/an/asee vendor advisory

Severity scores

Scored byCVSSScoreVector
CISA-ADP3.16.3 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L
  • Attack vector: network (remotely reachable)
  • Attack complexity: low
  • Privileges required: none (no login)
  • User interaction: required (a user must click/open something)
  • Scope: unchanged

CVSS measures how bad a flaw is if exploited, not how likely exploitation is. Read it next to the exploitation data below.

Exploitation and urgency

  • CISA KEV: added 2024-06-26; federal due date 2024-07-17. Known ransomware use: Unknown.
  • CISA required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
  • CISA SSVC assessment: exploitation active, automatable no, technical impact partial.
  • FIRST EPSS (model of 2026-10-21): 76.60% probability of exploitation activity in the next 30 days; percentile 99.5.

Timeline

  • — CVE record published by mitre
  • — Added to CISA’s Known Exploited Vulnerabilities catalog
  • — CISA remediation deadline for US federal agencies
  • — CVE record last updated

Sources and references

Original sources first. Version and fix details should always be confirmed against the vendor or project advisory.

Vendor and project advisories, patches

  1. DSA-4700 debian.org
  2. FEDORA-2020-2a1a6a8432 lists.fedoraproject.org
  3. FEDORA-2020-aeffd92b77 lists.fedoraproject.org
  4. Listed in CISA KEV notes (roundcube.net) roundcube.net

Vulnerability records

  1. CVE.org record CVE-2020-13965 cve.org
  2. NVD entry CVE-2020-13965 nvd.nist.gov

Government

  1. CISA Known Exploited Vulnerabilities catalog entry cisa.gov

Other references from the CVE record and advisory

  1. github.com github.com
  2. github.com github.com
  3. github.com github.com
  4. github.com github.com
  5. github.com github.com

All exploited Roundcube vulnerabilities · Today’s Security Digest