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.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | roundcube | 1.6.3+dfsg-1 | — |
| Debian 13 | roundcube | 1.6.3+dfsg-1 | — |
| Debian 12 | roundcube | 1.6.3+dfsg-1~deb12u1 | — |
| Debian 10 | roundcube | 1.3.17+dfsg.1-1~deb10u3 | DLA-3577-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 22.04 LTS | roundcube | 1.5.0+dfsg.1-2ubuntu0.1~esm2 | USN-6654-1 |
| Ubuntu Pro 20.04 LTS | roundcube | 1.4.3+dfsg.1-1ubuntu0.1~esm3 | USN-6654-1 |
| Ubuntu Pro 18.04 LTS | roundcube | 1.3.6+dfsg.1-1ubuntu0.1~esm3 | USN-6654-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 16.04 LTS | roundcube | 1.2~beta+dfsg.1-0ubuntu1+esm3 | USN-6654-1 |
Public exploits
Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.
GitHub 3 repositories
-
s3cb0y/CVE-2023-43770-POC ★ 35 · Sep 27, 2023
A Proof-Of-Concept for the CVE-2023-43770 vulnerability.
-
knight0x07/CVE-2023-43770-PoC ★ 3 · Sep 28, 2023
PoC for Stored XSS (CVE-2023-43770) Vulnerability
-
skyllpro/CVE-2021-44026-PoC ★ 0 · Apr 20, 2025
Bug Chain XSS (CVE-2020-35730 and CVE-2023-43770) to SQLi (CVE-2021-44026)
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
Advisories 3
- USN-6654-1 roundcube vulnerability Ubuntu Security Notices (USN) · Jun 25, 2026
- DLA-3577-1 roundcube - security update Debian Security (DSA / DLA) · Mar 9, 2026
- WID-SEC-2023-2425 Roundcube: Schwachstelle ermöglicht Cross-Site Scripting BSI CERT-Bund (WID) · Feb 12, 2024