CVE-2023-43770
KEVRoundcube Webmail Persistent Cross-Site Scripting (XSS) Vulnerability
Description
Roundcube Webmail contains a persistent cross-site scripting (XSS) vulnerability that can lead to information disclosure via malicious link references in plain/text messages.
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 3.1 vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:NPublishedSep 22, 2023
Last modifiedJun 17, 2026
Added to KEVFeb 12, 2024
Remediation dueMar 4, 2024
References
- github.com/roundcube/roundcubemail/commit/e92ec206a886461245e1672d8530cc93c618a49bPatch
- lists.debian.org/debian-lts-announce/2023/09/msg00024.htmlMailing List
- roundcube.net/news/2023/09/15/security-update-1.6.3-releasedRelease Notes
- cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-43770US Government Resource
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67
Risk assessment · High
Actively exploited. Patch immediately.
- Exploitation
- Confirmed in the wild (CISA KEV)
- Federal remediation deadline
- Overdue by 967 days
- CVSS
- 6.1 MEDIUM
- EPSS (30-day exploit probability)
- 63.7% · top 1% of all CVEs
- Weakness
- CWE-79
- Attack vector
- Network, remotely reachable
Recommended actions
- 1.Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
- 2.Treat as emergency change: patch or isolate internet-facing instances first.
- 3.Review exposure: confirm which instances are reachable from the internet and restrict access until patched.
- 4.Hunt for compromise: review logs for the disclosure window, not just from the patch date.
Assessment is derived automatically from the live signals above; verify against your own asset inventory.