CVE-2004-0591: Cross-site scripting (XSS) vulnerability in the print_header_uc function for SqWebMail 4.0.4 and earlier, and

This month

MEDIUM 6.8DOWNGRADE

CVE-2004-0591 is a medium-severity flaw (CVSS 6.8) affecting sqwebmail. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Cross-site scripting (XSS) vulnerability in the print_header_uc function for SqWebMail 4.0.4 and earlier, and possibly 3.x, allows remote attackers to inject arbitrary web script or HRML via (1) e-mail headers or (2) a message with a "message/delivery-status" MIME Content-Type.

Why this priority

EPSS top 8%: very likely to be exploited
Public exploit reference

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	6.8 (Medium)
EPSS exploit chance	5.0% (top 8%)
CISA exploited list	No
Published	2004-08-06
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: inter7

Last updated 2026-06-16 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2004-08-06 04:00 UTCPublished CVE record published
2026-06-16 22:05 UTCUpdated Record last modified

inter7 sqwebmail DOWNGRADE

Affected: 4.0.4

Fixed in: no fixed release known

Safe to downgrade to: a release before 4.0.4

1. Check installed version

apt-cache policy sqwebmail || rpm -q sqwebmail || sqwebmail --version

2. No fixed release: DOWNGRADE to a release before 4.0.4 (Debian / Ubuntu)

apt-cache madison sqwebmail sudo apt install sqwebmail=<VERSION_BEFORE_4.0.4> sudo apt-mark hold sqwebmail

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list sqwebmail sudo dnf downgrade sqwebmail-<VERSION_BEFORE_4.0.4> sudo dnf versionlock add sqwebmail

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Exploit-DB: SqWebMail 4.0.4.20040524 - Email Header HTML Injection

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2004-0591?

sqwebmail: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2004-0591 being exploited?

CVE-2004-0591 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2004-0591 affect?

CVE-2004-0591 affects sqwebmail. Severity is medium (CVSS 6.8). Cross-site scripting (XSS) vulnerability in the print_header_uc function for SqWebMail 4.0.4 and earlier, and possibly 3.x, allows remote attackers to inject arbitrary web script or HRML via (1) e-mail headers or (2) a message with a "messa

How urgent is CVE-2004-0591?

Priority 52/100. EPSS top 8%: very likely to be exploited; Public exploit reference

Related CVEs

CVE-2005-2820 MEDIUM 4.3 DOWNGRADE Cross-site scripting (XSS) vulnerability in SqWebMail 5.0.4 allows remote attackers to inject arbitrary web sc
CVE-2005-2769 MEDIUM 4.3 DOWNGRADE Cross-site scripting (XSS) vulnerability in SqWebMail 5.0.4 and possibly other versions allows remote attacker
CVE-2005-2724 MEDIUM 4.3 DOWNGRADE Cross-site scripting (XSS) vulnerability in SqWebMail 5.0.4 allows remote attackers to inject arbitrary web sc
CVE-2005-1308 HIGH 7.5 DOWNGRADE SqWebMail allows remote attackers to inject arbitrary web script or HTML via CRLF sequences in the redirect pa
CVE-2004-2313 MEDIUM 5.0 DOWNGRADE Inter7 SqWebMail 3.4.1 through 3.6.1 generates different error messages for incorrect passwords versus correct

References

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