CVE-2026-103647

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Source

https://cve.org/CVERecord?id=CVE-2026-103647

Import Source

https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-103647.json

JSON Data

https://api.osv.dev/v1/vulns/CVE-2026-103647

Published

2026-10-08T10:53:05Z

Modified

2026-10-10T02:47:26Z

Severity

8.0 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:N CVSS Calculator

Summary

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in hMailServer

Details

Cross-site scripting in the webmail of Progressive Robot hMailServer 6.3.2 through 6.3.5 allows a remote attacker who can send a user an encrypted message to run script in the webmail's origin with that user's session. When the webmail decrypted an S/MIME message (from 6.3.2) or an OpenPGP message (from 6.3.4) in the browser, it offered each decrypted attachment as a blob URL of the media type the message declared for it. A click saved the file, but if the user opened the attachment in a new tab, a part declared as text/html was rendered as a document of the webmail's origin and its script could read the mailbox, send mail and change the account through the REST API. The webmail is served only when the REST API is enabled, which it is not by default.

Database specific

{
    "cna_assigner": "GitLab",
    "cwe_ids": [
        "CWE-79"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/103xxx/CVE-2026-103647.json"
}

References

Affected packages

Git / gitlab.com/hmailserver/hmailserver

Affected ranges

Type

GIT

Repo

https://gitlab.com/hmailserver/hmailserver

Events

Introduced

1147c4fa51edd8077c3d972fe5fe8307a52e6254

Fixed

e3c448aa66fc310b74d076884d54fae951296915

Database specific

Show details

{
    "extracted_events": [
        {
            "introduced": "6.3.2"
        },
        {
            "fixed": "6.3.6"
        },
        {
            "fixed": "6.3.5"
        }
    ],
    "source": [
        "AFFECTED_FIELD",
        "DESCRIPTION"
    ]
}

Affected versions

v6.*

v6.3.2

v6.3.3

v6.3.4

v6.3.5

Database specific

source

"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-103647.json"