In Roundcube Webmail before 1.6.18 and 1.7.x before 1.7.3, responses from the CSS (Cascading Style Sheets) proxy were not validated, which may result in information disclosure or XSS (cross-site scripting) via MIME sniffing.
{
"cna_assigner": "mitre",
"cwe_ids": [
"CWE-79"
],
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74998.json"
}{
"cpe": "cpe:2.3:a:roundcube:webmail:*:*:*:*:*:*:*:*",
"extracted_events": [
{
"introduced": "1.6.0"
},
{
"fixed": "1.6.18"
},
{
"introduced": "1.7.0"
},
{
"fixed": "1.7.3"
}
],
"source": [
"CPE_RANGE",
"REFERENCES"
]
}