CVE-2023-43770
MediumExploitedPublic exploitroundcube - security update
Published Sep 29, 2023 · Updated Sep 17, 2026 · Also known as BIT-roundcube-2023-43770, DEBIAN-CVE-2023-43770, DLA-3577-1, TR-23-0564, UBUNTU-CVE-2023-43770, USN-6654-1
Key Facts
Patch immediately- CVE-2023-43770 is a medium-severity vulnerability (CVSS 6.1 v3.1) affecting Webmail (Roundcube), Debian Linux, roundcube (bitnami).
- It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Feb 12, 2024. Public exploit code is available.
- EPSS estimates a 64% probability of exploitation in the next 30 days.
- Fixed versions are available, including roundcube 1.2~beta+dfsg.1-0ubuntu1+esm3, roundcube 1.3.17+dfsg.1-1~deb10u3, roundcube 1.3.6+dfsg.1-1ubuntu0.1~esm3.
- Brandefense priority: patch immediately, because it is listed as exploited in the wild.
CVSS v3.1
6.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
EPSS (30-day exploit likelihood)
64%
Higher than 99.2% of all scored CVEs
Exploited in the wild
Yes
4 catalog listings
Public exploit code
Available
Proof-of-concept or weaponized module
Get the full CVE-2023-43770 brief as a PDF
Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.
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.
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| CISA KEV | Feb 12, 2024 | Mar 4, 2024 | Not reported |
| Industry KEV feed | Feb 12, 2024 | Mar 4, 2024 | Not reported |
| CIRCL KEV | Feb 12, 2024 | Mar 4, 2024 | Not reported |
| ENISA EUVD | Feb 12, 2024 | n/a | Not reported |
Required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
Affected Products
22 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| WebmailRoundcube | See advisory | 1.4.14 |
| Debian LinuxDebian | 10.0 | n/a |
| roundcubebitnami | See advisory | 1.4.14 |
Patched Releases
roundcube
1.2~beta+dfsg.1-0ubuntu1+esm3, 1.3.17+dfsg.1-1~deb10u3, 1.3.6+dfsg.1-1ubuntu0.1~esm3, 1.4.14, 1.4.14+dfsg.1-1~deb11u1, 1.4.3+dfsg.1-1ubuntu0.1~esm3, 1.5.0+dfsg.1-2ubuntu0.1~esm2, 1.5.4, 1.6.3, 1.6.3+dfsg-1, 1.6.3+dfsg-1~deb12u1
Webmail
1.4.14
Timeline
Publicly disclosed
Sep 29, 2023
Added to CISA KEV
Feb 12, 2024
Added to Industry KEV feed
Feb 12, 2024
Added to CIRCL KEV
Feb 12, 2024
Added to ENISA EUVD
Feb 12, 2024
Last updated
Sep 17, 2026
Weakness Type
- CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
References
- advisoryhttps://github.com/CVEProject/cvelistV5/tree/main/cves/2023/43xxx/CVE-2023-43770.json
- advisoryhttps://nvd.nist.gov/vuln/detail/CVE-2023-43770
- advisoryhttps://roundcube.net/news/2023/09/15/security-update-1.6.3-released
- advisoryhttps://security-tracker.debian.org/tracker/CVE-2023-43770
- advisoryhttps://ubuntu.com/security/CVE-2023-43770
FAQ
Common Questions.
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: Webmail (Roundcube); Debian Linux versions 10.0; roundcube (bitnami). The full list is in the CVE brief.
It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Feb 12, 2024.
Yes. It was added on Feb 12, 2024 with a federal remediation due date of Mar 4, 2024.
Public exploit code is available.
Fixed versions are available, including roundcube 1.2~beta+dfsg.1-0ubuntu1+esm3, roundcube 1.3.17+dfsg.1-1~deb10u3, roundcube 1.3.6+dfsg.1-1ubuntu0.1~esm3.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
Is CVE-2023-43770 Running On Your Attack Surface?
Brandefense maps vulnerabilities like this one to your internet-facing assets and tells you exactly where to patch.
Request A Demo