# CVE-2020-35730: Roundcube Webmail Cross-Site Scripting (XSS) Vulnerability

- Exploited (CISA KEV): yes, added 2023-06-22
- Published: 2020-12-28
- CVSS: 6.1 MEDIUM (v3.1)
- EPSS: 32.9% (98th percentile)
- CWE: CWE-79

An XSS issue was discovered in Roundcube Webmail before 1.2.13, 1.3.x before 1.3.16, and 1.4.x before 1.4.10. The attacker can send a plain text e-mail message, with JavaScript in a link reference element that is mishandled by linkref_addindex in rcube_string_replacer.php.

## Edge WAF coverage (claimed by vendors, not measured)

| Vendor | Status | First rule | Days after publication |
|---|---|---|---|
| Cloudflare | Before feed history | — | — |
| AWS | No public claim | — | — |
| Microsoft Azure | No public claim | — | — |
| Google Cloud | Before feed history | — | — |
| Fastly | Before feed history | — | — |
| F5 | Before feed history | — | — |
| Akamai | No public source | — | — |
| OWASP CRS | Before feed history | — | — |

"No public claim" means no vendor statement names this CVE; "Before feed history" means the CVE is older than the vendor feed. In both cases generic rules may still block it.

HTML: https://cve.vigilbase.com/cve/CVE-2020-35730 · JSON: https://cve.vigilbase.com/api/v1/cves/CVE-2020-35730