Medium 6.1Known exploited (CISA KEV)Published Sep 21, 2023

CVE-2023-43770Roundcube 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.

Updated under an hour ago (Oct 27, 2026, 4:00 PM ET)

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It affects roundcube webmail and 1 other product. Add what you run to find out whether that includes you.

CISA lists it as known exploited since Feb 12, 2024; federal agencies had to remediate by Mar 4, 2024. Treat that date as your deadline.

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Every CVE for roundcube webmail

Exploited in the last 30 days

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 MEDIUM (v3.1, CISA ADP)CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Weakness (CWE): CWE-79
Known exploited: Added to CISA KEV Feb 12, 2024; federal remediation due Mar 4, 2024Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
EPSS (exploitation in the next 30 days): 63.66% (percentile 99)
Assigned by: mitre
NVD analysis: Analyzed
Record last updated: Oct 21, 2025
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

roundcube webmail roundcube:webmail	before 1.4.14	CISA ADP
debian debian_linux debian:debian_linux	10	CISA ADP
roundcube webmail roundcube:webmail	before 1.4.14; from 1.5.0 before 1.5.4; from 1.6.0 before 1.6.3	NVD
debian debian_linux debian:debian_linux	10.0	NVD

References

References

https://github.com/roundcube/roundcubemail/commit/e92ec206a886461245e1672d8530cc93c618a49b	patch
https://roundcube.net/news/2023/09/15/security-update-1.6.3-released	release-notes
https://lists.debian.org/debian-lts-announce/2023/09/msg00024.html	mailing-list
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-43770	us-government-resource

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.