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CVE-2004-0203

26
FAUCET Score

CVE-2004-0203 describes a Cross-Site Scripting (XSS) vulnerability in Microsoft Outlook Web Access for Exchange Server 5.5 Service Pack 4. This flaw allows remote attackers to inject arbitrary script or spoof content within HTML emails or web caches through an HTML redirect query. The vulnerability has a CVSS score of 4.3 (Medium), indicating a network-based attack with medium complexity and a potential impact of partial integrity compromise. While there is no evidence of active exploitation, no public exploit code, and it's not on the KEV catalog, it has garnered significant community discussion with 10 mentions.

Impacted Technologies

VendorProductVersion(s)CPE
5.5CPE matchmatch criteria
cpe:2.3:a:microsoft:exchange_server:5.5:-:*:*:*:*:*:*
5.5CPE matchmatch criteria
cpe:2.3:a:microsoft:exchange_server:5.5:sp1:*:*:*:*:*:*
5.5CPE matchmatch criteria
cpe:2.3:a:microsoft:exchange_server:5.5:sp2:*:*:*:*:*:*
5.5CPE matchmatch criteria
cpe:2.3:a:microsoft:exchange_server:5.5:sp3:*:*:*:*:*:*
5.5CPE matchmatch criteria
cpe:2.3:a:microsoft:exchange_server:5.5:sp4:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

4.3MEDIUM

AV:N/AC:M/Au:N/C:N/I:P/A:N

Confidentiality Impact
NONE
Integrity Impact
PARTIAL
Availability Impact
NONE
Access Vector
NETWORK
Access Complexity
MEDIUM
Authentication
NONE
Exploitability Score
8.6
Impact Score
2.9
CvssVersion
2.0

Exploit Intelligence

EPSS Score
20.98%
Probability of exploitation in next 30 days
EPSS Percentile
97.3%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.2098 is in the 98th percentile among its peer group of 19,958 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

docs.microsoft.com / en-us/security-updates/securitybulletins/2004/ms04-026
PatchVendor Advisory
exchange.xforce.ibmcloud.com / vulnerabilities/16583
Third Party AdvisoryVDB Entry
oval.cisecurity.org / repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A2016
Third Party Advisory
kb.cert.org / vuls/id/948750
Third Party AdvisoryUS Government Resource