CVE-2023-39700: IceWarp Mail Server v10.4.5 was discovered to contain a reflected cross-site scripting (XSS) vulnerability via

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MEDIUM 6.1DOWNGRADE

CVE-2023-39700 is a medium-severity flaw (CVSS 6.1) affecting mail server. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

IceWarp Mail Server v10.4.5 was discovered to contain a reflected cross-site scripting (XSS) vulnerability via the color parameter.

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	1.5% (top 26%)
CISA exploited list	No
Weakness	CWE-79
Published	2023-08-25
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: icewarp

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

Am I affected?

Timeline

2023-08-25 00:15 UTCPublished CVE record published
2026-06-17 06:12 UTCUpdated Record last modified

icewarp mail server DOWNGRADE

Affected: 10.4.5

Fixed in: no fixed release known

Safe to downgrade to: a release before 10.4.5

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 10.4.5 (Debian / Ubuntu)

apt-cache madison mail-server sudo apt install mail-server=<VERSION_BEFORE_10.4.5> sudo apt-mark hold mail-server

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

dnf --showduplicates list mail-server sudo dnf downgrade mail-server-<VERSION_BEFORE_10.4.5> sudo dnf versionlock add mail-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.

Public exploits and detection

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

Nuclei scan template: IceWarp Mail Server v10.4.5 - Cross-Site Scripting

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-2023-39700?

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

Is CVE-2023-39700 being exploited?

CVE-2023-39700 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-2023-39700 affect?

CVE-2023-39700 affects mail server. Severity is medium (CVSS 6.1). IceWarp Mail Server v10.4.5 was discovered to contain a reflected cross-site scripting (XSS) vulnerability via the color parameter.

How urgent is CVE-2023-39700?

Priority 45/100. Public exploit reference

Related CVEs

CVE-2025-2848 MEDIUM 6.3 UPGRADE A vulnerability in Synology Mail Server allows remote authenticated attackers to read and write non-sensitive
CVE-2021-36580 MEDIUM 6.1 UPGRADE UPGRADE Open Redirect vulnerability exists in IceWarp MailServer IceWarp Server Deep Castle 2 Update 1 (13.0.1.2) via
CVE-2025-40632 MEDIUM 6.1 DOWNGRADE Cross-site scripting (XSS) in Icewarp Mail Server affecting version 11.4.0
CVE-2025-40631 MEDIUM 6.1 DOWNGRADE HTTP host header injection vulnerability in Icewarp Mail Server affecting version 11.4.0
CVE-2025-40630 MEDIUM 6.1 DOWNGRADE Open redirection vulnerability in IceWarp Mail Server affecting version 11.4.0

References

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