CVE-2023-43770

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 v3.1 NVD

6.1 MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

EPSS

63.66% chance of exploitation in the next 30 days, 99th percentile

CISA KEV

added 2024-02-12

Published

2023-09-22

Updated

2025-10-21

Proof-of-concept exploits (3)

• knight0x07/CVE-2023-43770-PoC3★ · 2023-09-28
• s3cb0y/CVE-2023-43770-POC35★ · 2023-10-02
• skyllpro/CVE-2021-44026-PoC0★ · 2025-04-20

Security advisories

• roundcube/roundcubemail/commit/e92ec206a886461245e1672d8530cc93c618a49b
• https://roundcube.net/news/2023/09/15/security-update-1.6.3-released

References

• CVE Record
• NVD entry

Related

• CVE-2025-8088
• CVE-2020-35730
• CVE-2021-44026