CVE-2007-1991

Cross-site scripting (XSS) vulnerability in mail/signup.asp in CmailServer WebMail 5.4.3, and possibly earlier, allows remote attackers to inject arbitrary web script or HTML via the Comment parameter, a different vector than CVE-2007-1927.

Published: 2007-04-12 Last update: 2026-04-23 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2007-1991 is rated Low Risk (38.6/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 1.02%). Monitor for updates and reassess as exploit intelligence or EPSS changes.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2007-1991

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 0.25% 1.02% +0.77%
2 2025-03-17 0.24% 0.25% +0.01%
3 2024-12-17 — 0.24% —

Full EPSS history (6 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2007-1991

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
4.3 2.0 MEDIUM
AV:N/AC:M/Au:N/C:N/I:P/A:N Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:M)
Exploitation needs some favorable conditions, but not exceptional ones.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:N)
No availability impact.
 8.6 2.9 [email protected]

Weakness enumeration for CVE-2007-1991

Affected software / configurations for CVE-2007-1991

Vendor Product Version Raw CPE
youngzsoft cmailserver <= 5.4.3 cpe:2.3:a:youngzsoft:cmailserver:*:*:*:*:*:*:*:*

References for CVE-2007-1991

cvelogic Threat Intelligence