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CISA KEV · Known exploitedMedium

CVE-2023-5631

Roundcube Webmail

Roundcube before 1.4.15, 1.5.x before 1.5.5, and 1.6.x before 1.6.4 allows stored XSS via an HTML e-mail message with a crafted SVG document because of program/lib/Roundcube/rcube_washtml.php behavior. This could allow a remote attacker to load arbitrary JavaScript code.

CVSS
5.4
EPSS
75.9%
99.5% percentile
CISA KEV
Listed
Published
2023.10.19
PRIORITY ASSESSMENT

Immediate review

CISA has listed this vulnerability in the Known Exploited Vulnerabilities catalog.

Known exploitationConfirmed by CISA KEV
Exploit probability75.9%
Technical severityCVSS 5.4

Vulnerability overview

Roundcube before 1.4.15, 1.5.x before 1.5.5, and 1.6.x before 1.6.4 allows stored XSS via an HTML e-mail message with a crafted SVG document because of program/lib/Roundcube/rcube_washtml.php behavior. This could allow a remote attacker to load arbitrary JavaScript code.

Affected product and versions

Product
Roundcube Webmail
Affected versions
1.6.0, 1.5.0, 1.4.0, < 1.4.15, >= 1.5.0 < 1.5.5, >= 1.6.0 < 1.6.4, 10.0, 11.0, 12.0, 39
Fixed versions
1.4.15, 1.5.5, 1.6.4

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
CISA required action

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

Due date: 2023.11.16
  1. 1
    Identify

    Confirm that Roundcube Webmail and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
CWE
CWE-79
KEV added
2023.10.26
Ransomware use
미확인
CVE-2023-5631 — Roundcube Webmail | SECUFOCUS NOW