CVE-2026-35539

An issue was discovered in Roundcube Webmail before 1.5.14 and 1.6.14. XSS exists because of insufficient HTML attachment sanitization in preview mode. A victim must preview a text/html attachment.

Database specific

{
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/35xxx/CVE-2026-35539.json",
    "cwe_ids": [
        "CWE-79"
    ],
    "cna_assigner": "mitre"
}

References

Affected packages

Git / github.com/roundcube/roundcubemail

Affected ranges

Type

GIT

Repo

https://github.com/roundcube/roundcubemail

Events

Introduced

Fixed

d742954ccbcdee7020f8f2e7c49ce0fca5a0efab

Introduced

993b888afe29c383bf45c84f17090f4db96367ba

Fixed

27ec6cc9cb25e1ef8b4d4ef39ce76d619caa6870

Fixed

10a6d1fa8acac85c727b0a6ae4a6642bfa27bea1

Fixed

1b30edf5369668c92fe91dae3d52e477c808aa4f

Fixed

8e4a99b0746577c2928f5ae984b3ab533b970ca0

Database specific

{
    "cpe": "cpe:2.3:a:roundcube:webmail:*:*:*:*:*:*:*:*",
    "source": [
        "CPE_RANGE",
        "REFERENCES"
    ],
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "fixed": "1.5.14"
        },
        {
            "introduced": "1.6.0"
        },
        {
            "fixed": "1.6.14"
        }
    ]
}

Affected versions

1.*

1.1-beta

1.1-rc

1.1.0

1.2-beta

1.2-rc

1.3-beta

1.4-beta

1.4-rc1

1.4-rc2

1.5-beta

1.5-rc

1.5.0

1.5.1

1.5.10

1.5.11

1.5.12

1.5.13

1.5.2

1.5.3

1.5.4

1.5.5

1.5.6

1.5.7

1.5.8

1.5.9

1.6-beta

1.6.0

1.6.1

1.6.10

1.6.11

1.6.12

1.6.13

1.6.2

1.6.3

1.6.4

1.6.5

1.6.6

1.6.7

1.6.8

1.6.9

1.7-beta

1.7-beta2

1.7-rc

1.7-rc2

1.7-rc3

1.7-rc4

v0.*

v0.1-beta2

Database specific

source

"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-35539.json"