CVE-2023-43770

medium

Description

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.

References

https://securityaffairs.com/183222/apt/ukraine-sees-surge-in-ai-powered-cyberattacks-by-russia-linked-threat-actors.html

https://therecord.media/russian-hackers-turn-to-ai-ukraine-cert

https://www.darkreading.com/application-security/poc-code-escalates-roundcube-vuln-threat

https://www.securityweek.com/russian-apt-exploiting-mail-servers-against-government-defense-organizations/

https://www.infosecurity-magazine.com/news/fancy-bear-russia-cyber-espionage/

https://www.welivesecurity.com/en/eset-research/operation-roundpress/

https://www.bleepingcomputer.com/news/security/government-webmail-hacked-via-xss-bugs-in-global-spy-campaign/

https://thehackernews.com/2025/05/russia-linked-apt28-exploited-mdaemon.html

https://www.bleepingcomputer.com/news/security/hackers-exploit-roundcube-webmail-flaw-to-steal-email-credentials/

https://www.helpnetsecurity.com/2024/08/07/cve-2024-42009-cve-2024-42008/

https://www.bleepingcomputer.com/news/security/cisa-roundcube-email-server-bug-now-exploited-in-attacks/

https://thehackernews.com/2025/10/from-phishing-to-malware-ai-becomes.html

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-43770

https://roundcube.net/news/2023/09/15/security-update-1.6.3-released

https://lists.debian.org/debian-lts-announce/2023/09/msg00024.html

https://github.com/roundcube/roundcubemail/commit/e92ec206a886461245e1672d8530cc93c618a49b

Details

Source: Mitre, NVD

Published: 2023-09-22

Updated: 2025-10-31

Known Exploited Vulnerability (KEV)

Risk Information

CVSS v2

Base Score: 6.4

Vector: CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:N

Severity: Medium

CVSS v3

Base Score: 6.1

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N