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CISA KEV · Known exploitedMedium

CVE-2023-43770

Roundcube Webmail

Roundcube before 1.4.14, 1.5.x before 1.5.4, and 1.6.x before 1.6.3 allows XSS via text/plain e-mail messages with crafted links because of program/lib/Roundcube/rcube_string_replacer.php behavior.

CVSS
6.1
EPSS
58.5%
99.0% percentile
CISA KEV
Listed
Published
2023.09.22
PRIORITY ASSESSMENT

Immediate review

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

Known exploitationConfirmed by CISA KEV
Exploit probability58.5%
Technical severityCVSS 6.1

Vulnerability overview

Roundcube before 1.4.14, 1.5.x before 1.5.4, and 1.6.x before 1.6.3 allows XSS via text/plain e-mail messages with crafted links because of program/lib/Roundcube/rcube_string_replacer.php behavior.

Affected product and versions

Product
Roundcube Webmail
Affected versions
1.5.0, 1.6.0, 10, < 1.4.14, >= 1.5.0 < 1.5.4, >= 1.6.0 < 1.6.3, 10.0
Fixed versions
1.4.14, 1.5.4, 1.6.3

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: 2024.03.04
  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:N/UI:R/S:C/C:L/I:L/A:N
CWE
CWE-79
KEV added
2024.02.12
Ransomware use
미확인
CVE-2023-43770 — Roundcube Webmail | SECUFOCUS NOW