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"
}{
"extracted_events": [
{
"cpe": "cpe:2.3:a:roundcube:webmail:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "1.6.0"
},
{
"fixed": "1.6.18"
}
],
"source": "CPE_RANGE"
},
{
"cpe": "cpe:2.3:a:roundcube:webmail:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "1.7.0"
},
{
"fixed": "1.7.3"
}
],
"source": "CPE_RANGE"
},
{
"range": [
{
"fixed": "62d33c8a0dc3fd0dd03984220dc9709e8e0de43b"
}
],
"source": "REFERENCES_COMMIT"
},
{
"range": [
{
"fixed": "a2334990c02f7cb77b1a8d6fa97fcd9e1b5cd1fb"
}
],
"source": "REFERENCES_COMMIT"
},
{
"original_tag": "1.6.18",
"range": [
{
"fixed": "4a2bb87d9ea93578acb9bb03599abf754c33a33f"
}
],
"source": "REFERENCES_TAG"
},
{
"original_tag": "1.7.3",
"range": [
{
"fixed": "8473c30fd06f1aa4cfe4304ec54f54aef3b45abe"
}
],
"source": "REFERENCES_TAG"
}
]
}