CVE-2024-55492: Winmail Server 4.4 is vulnerable to f_user=%22%3E%3Csvg%20onload Cross Site Scripting (XSS).

Routine

MEDIUM 6.1DOWNGRADE

CVE-2024-55492 is a medium-severity flaw (CVSS 6.1) affecting winmail server. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Winmail Server 4.4 is vulnerable to f_user=%22%3E%3Csvg%20onload Cross Site Scripting (XSS).

Why this priority

Public exploit reference

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

Risk facts

CVSS score	6.1 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.3% (top 79%)
CISA exploited list	No
Weakness	CWE-79
Published	2024-12-18
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: magicwinmail

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2024-12-18 17:15 UTCPublished CVE record published
2026-06-17 08:11 UTCUpdated Record last modified

magicwinmail winmail server DOWNGRADE

Affected: 4.4

Fixed in: no fixed release known

Safe to downgrade to: a release before 4.4

1. Check installed version

apt-cache policy winmail-server || rpm -q winmail-server || winmail-server --version

2. No fixed release: DOWNGRADE to a release before 4.4 (Debian / Ubuntu)

apt-cache madison winmail-server sudo apt install winmail-server=<VERSION_BEFORE_4.4> sudo apt-mark hold winmail-server

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

dnf --showduplicates list winmail-server sudo dnf downgrade winmail-server-<VERSION_BEFORE_4.4> sudo dnf versionlock add winmail-server

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.

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-2024-55492?

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

Is CVE-2024-55492 being exploited?

CVE-2024-55492 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-2024-55492 affect?

CVE-2024-55492 affects winmail server. Severity is medium (CVSS 6.1). Winmail Server 4.4 is vulnerable to f_user=%22%3E%3Csvg%20onload Cross Site Scripting (XSS).

How urgent is CVE-2024-55492?

Priority 32/100. Public exploit reference

References

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