Roundcube's HTML sanitization path for message rendering allows loopback, localhost, RFC1918, link-local, and ULA URLs even when remote content loading is disabled. A remote attacker can send an HTML email that causes the victim's browser to issue requests to local or private-network services simply by opening the message preview.
Metrics
Affected Vendors & Products
References
History
Thu, 28 May 2026 14:15:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Metrics |
ssvc
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Thu, 28 May 2026 12:45:00 +0000
| Type | Values Removed | Values Added |
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| Description | Roundcube's HTML sanitization path for message rendering allows loopback, localhost, RFC1918, link-local, and ULA URLs even when remote content loading is disabled. A remote attacker can send an HTML email that causes the victim's browser to issue requests to local or private-network services simply by opening the message preview. | |
| Title | Roundcube Local/Private URL Fetch Bypass | |
| First Time appeared |
Roundcube
Roundcube webmail |
|
| Weaknesses | CWE-184 | |
| CPEs | cpe:2.3:a:roundcube:webmail:*:*:*:*:*:*:*:* | |
| Vendors & Products |
Roundcube
Roundcube webmail |
|
| References |
|
|
| Metrics |
cvssV3_1
|
Status: REJECTED
Assigner: OCD
Published:
Updated: 2026-05-28T16:35:38.661Z
Reserved: 2026-05-28T10:37:45.625Z
Link: CVE-2026-9818
Updated: 2026-05-28T13:24:14.064Z
Status : Received
Published: 2026-05-28T13:16:25.440
Modified: 2026-05-28T13:16:25.440
Link: CVE-2026-9818
No data.
OpenCVE Enrichment
Updated: 2026-05-28T16:30:15Z