CVE-2026-9818 Details
Description
Rejected reason: This CVE ID has been rejected or withdrawn by its CVE Numbering Authority.
A vulnerability in Roundcube Webmail's HTML sanitization process for message rendering allows loopback, localhost, RFC1918, link-local, and ULA URLs to be accessed, even when remote content loading is disabled. This issue can be exploited by a remote attacker who sends an HTML email that, when previewed, causes the recipient's browser to make requests to local or private-network services.
Users can update to Roundcube Webmail versions 1.6.16 or 1.7.1, both of which include the necessary fix. Instructions for downloading these versions are available on the Roundcube GitHub Releases page.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No CVSS 3.x data is available for this CVE.
No data available for CVSS Version 2.0 on this CVE.
No SSVC data is available for this CVE.
References to Advisories, Solutions, and Tools
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No references are available for this CVE.
Weakness Enumeration
No weakness enumeration is available for this CVE.
Affected Products
No affected product data is available for this CVE.
Change History
3 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| May 28, 2026 | CVE Rejected | OCD |
| May 28, 2026 | CVE Modified | OCD |
| May 28, 2026 | New CVE Received | OCD |