CVE-2026-100741
- Source
- https://cve.org/CVERecord?id=CVE-2026-100741
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-100741.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2026-100741
- Published
- 2026-09-27T07:12:54Z
- Modified
- 2026-09-29T08:06:45Z
- Severity
-
- 9.8 (Critical) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
- Summary
- Improper Neutralization of Directives in Dynamically Evaluated Code ('Eval Injection') in hMailServer
- Details
-
Eval injection in the JScript event-script dispatcher in Progressive Robot Ltd's hMailServer, versions 6.0.0 through 6.3.3 on Windows, allows a remote, unauthenticated attacker to run arbitrary JScript inside the hMailServer service process, with the privileges of the service account, via a password containing a backslash followed by an apostrophe, sent in any logon (SMTP AUTH, POP3, IMAP) that names an existing, active account. Exploitation requires a non-default configuration: event scripting enabled (off by default), the script language set to JScript (the default is VBScript), and an OnClientValidatePassword handler defined in the event script. The server wrote event values into the handler call as JScript string literals, escaping the apostrophe but not the backslash, so such a value closes the literal and the rest of it is parsed as script. The same flaw is reachable by a remote POP3 server through the message UID it returns, where an OnExternalAccountDownload handler is defined, and by a remote SMTP server through the error reply it rejects a delivery with, where an OnDeliveryFailed handler is defined. Before 6.2.25 the injected script can create any COM object, and from 6.2.25 it can with the default ScriptAllowedObjects value of '*'; WScript.Shell among them gives command execution as the service account. VBScript event scripts and the Linux builds of Progressive Robot Ltd's hMailServer are not affected.
- Database specific
{ "cna_assigner": "GitLab", "cwe_ids": [ "CWE-95" ], "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/100xxx/CVE-2026-100741.json" }- References
-
- https://gitlab.com/Progressiverobot/hmailserver/-/releases/v6.3.4
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/100xxx/CVE-2026-100741.json
- https://nvd.nist.gov/vuln/detail/CVE-2026-100741
- https://gitlab.com/Progressiverobot/hmailserver/-/commit/5a3de9001d6c5e833662ada8e44ce10d42d76b1a
Affected packages
Git / gitlab.com/progressiverobot/hmailserver
Affected versions
Other
build-inputs-1
v6.*
v6.0.0
v6.0.0-B3
v6.0.0-B4
v6.1.0
v6.2.0
v6.2.1
v6.2.10
v6.2.11
v6.2.12
v6.2.13
v6.2.14
v6.2.15
v6.2.16
v6.2.17
v6.2.18
v6.2.19
v6.2.2
v6.2.20
v6.2.21
v6.2.22-pre1
v6.2.22-pre2
v6.2.22-pre3
v6.2.22-pre4
v6.2.22-pre5
v6.2.22-pre6
v6.2.23-alpha1
v6.2.23-alpha2
v6.2.24
v6.2.25
v6.2.26
v6.2.27
v6.2.28
v6.2.3
v6.2.4
v6.2.5
v6.2.6
v6.2.7
v6.2.8
v6.2.9
v6.3.0
v6.3.1
v6.3.2
v6.3.3
Database specific
source
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