SeaMonkey

by SeaMonkey e.V.v2.53.23

Last updated Jun 8, 2026

Web-browser, advanced e-mail, newsgroup and feed client, IRC chat, and HTML editing made simple—all your Internet needs in one application.

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Install with winget

$ winget install --id Mozilla.SeaMonkey --exact --version 2.53.23

Run in Command Prompt, PowerShell, or Windows Terminal. Prompts for any agreements.

Silent install command for SeaMonkey

SeaMonkey uses EXE (NSIS). The silent install switches are /S.

One-line silent install (x64, machine scope)

seamonkey-2.53.23.en-US.win64.installer.exe /S

See the full silent install reference for SeaMonkey →

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About

The SeaMonkey project is a community effort to develop the SeaMonkey all-in-one internet application suite. Such a software suite was previously made popular by Netscape and Mozilla, and the SeaMonkey project continues to develop and deliver high-quality updates as well as new features and improvements to this concept. Containing an Internet browser, email & newsgroup client, HTML editor, IRC chat and web development tools, SeaMonkey is sure to appeal to advanced users, web developers and corporate users.

SeaMonkey is built on the open source Mozilla Gecko engine, the same code which underlies the highly successful Thunderbird and is the base for the Firefox browser. SeaMonkey benefits from the cross-fertilization with these other projects, by gaining (and contributing) new features and the ongoing security updates which are a modern necessity. The SeaMonkey Association provides legal backing for the SeaMonkey Project.

Installers · v2.53.23

Architecture	Type	Scope	Download
x64	EXE NSIS	machine	Direct
x64	EXE NSIS	machine	Direct
x64	EXE NSIS	machine	Direct
x64	EXE NSIS	machine	Direct
x64	EXE NSIS	machine	Direct
x64	EXE NSIS	machine	Direct
x64	EXE NSIS	machine	Direct
x64	EXE NSIS	machine	Direct
x64	EXE NSIS	machine	Direct
x64	EXE NSIS	machine	Direct
x64	EXE NSIS	machine	Direct
x64	EXE NSIS	machine	Direct
x64	EXE NSIS	machine	Direct
x64	EXE NSIS	machine	Direct
x64	EXE NSIS	machine	Direct
x64	EXE NSIS	machine	Direct
x64	EXE NSIS	machine	Direct
x64	EXE NSIS	machine	Direct
x64	EXE NSIS	machine	Direct
x64	EXE NSIS	machine	Direct
x64	EXE NSIS	machine	Direct
x64	EXE NSIS	machine	Direct
x64	EXE NSIS	machine	Direct

Copy a command tailored to that specific architecture, type, and scope - useful when winget would otherwise pick a different default.

Security

25 known CVEs via NVD

nonePatched in wingetCVE-2007-1282affects v1.0.1Mar 5, 2007
Integer overflow in Mozilla Thunderbird before 1.5.0.10 and SeaMonkey before 1.0.8 allows remote attackers to trigger a buffer overflow and possibly execute arbitrary code via a text/enhanced or text/richtext e-mail message with an extremely long line.
Patch
nonePatched in wingetCVE-2007-0994affects before 1.0.8, 1.1.1Mar 5, 2007
A regression error in Mozilla Firefox 2.x before 2.0.0.2 and 1.x before 1.5.0.10, and SeaMonkey 1.1 before 1.1.1 and 1.0 before 1.0.8, allows remote attackers to execute arbitrary JavaScript as the user via an HTML mail message with a javascript: URI in an (1) img, (2) link, or...
Patch Vendor advisory
nonePatched in wingetCVE-2007-0996affects v1.0Feb 26, 2007
The child frames in Mozilla Firefox before 1.5.0.10 and 2.x before 2.0.0.2, and SeaMonkey before 1.0.8 inherit the default charset from the parent window, which allows remote attackers to conduct cross-site scripting (XSS) attacks, as demonstrated using the UTF-7 character set.
Patch Vendor advisory
nonePatched in wingetCVE-2007-0008affects v1.0.4Feb 26, 2007
Integer underflow in the SSLv2 support in Mozilla Network Security Services (NSS) before 3.11.5, as used by Firefox before 1.5.0.10 and 2.x before 2.0.0.2, SeaMonkey before 1.0.8, Thunderbird before 1.5.0.10, and certain Sun Java System server products before 20070611, allows re...
Patch Vendor advisory
nonePatched in wingetCVE-2007-0009affects before 1.0.8Feb 26, 2007
Stack-based buffer overflow in the SSLv2 support in Mozilla Network Security Services (NSS) before 3.11.5, as used by Firefox before 1.5.0.10 and 2.x before 2.0.0.2, Thunderbird before 1.5.0.10, SeaMonkey before 1.0.8, and certain Sun Java System server products before 20070611,...
Vendor advisory
nonePatched in wingetCVE-2007-0778affects before 1.0.8Feb 26, 2007
The page cache feature in Mozilla Firefox before 1.5.0.10 and 2.x before 2.0.0.2, and SeaMonkey before 1.0.8 can generate hash collisions that cause page data to be appended to the wrong page cache, which allows remote attackers to obtain sensitive information or enable further...
Patch Vendor advisory
nonePatched in wingetCVE-2007-0779affects v1.0.6Feb 26, 2007
GUI overlay vulnerability in Mozilla Firefox 1.5.x before 1.5.0.10 and 2.x before 2.0.0.2, and SeaMonkey before 1.0.8 allows remote attackers to spoof certain user interface elements, such as the host name or security indicators, via the CSS3 hotspot property with a large, trans...
Patch Vendor advisory
nonePatched in wingetCVE-2007-0780affects before 1.0.8Feb 26, 2007
browser.js in Mozilla Firefox 1.5.x before 1.5.0.10 and 2.x before 2.0.0.2, and SeaMonkey before 1.0.8 uses the requesting URI to identify child windows, which allows remote attackers to conduct cross-site scripting (XSS) attacks by opening a blocked popup originating from a jav...
Patch Vendor advisory

Showing 8 of 25. Source: NVD, updated 5h ago. Patch status is best-effort: NVD's fix version is compared against the latest version in winget, but the two version formats don't always align. Confirm with the vendor advisory before treating any specific build as safe.

See a CVE that affects your fleet? Push the patched version to Intune in one click with Pckgr - automated patching is the only way to keep up.

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More from SeaMonkey e.V. or browse browser, email, gecko.

Frequently asked questions

How do I install SeaMonkey on Windows?

Open Windows Terminal, PowerShell, or Command Prompt and run: winget install --id Mozilla.SeaMonkey --exact --version 2.53.23. winget downloads the installer from SeaMonkey e.V. and runs it. Requires Windows 10 (1809+) or Windows 11.

How do I install SeaMonkey silently for unattended deployment?

Add --silent and accept the agreements upfront: winget install --id Mozilla.SeaMonkey --exact 2.53.23 --silent --accept-package-agreements --accept-source-agreements. This is the variant Intune, Configuration Manager, and other deployment tools should use.

What are the silent install switches for SeaMonkey?

SeaMonkey uses EXE (NSIS). Run the downloaded installer with: seamonkey-2.53.23.en-US.win64.installer.exe /S. The silent switches are /S.

How do I uninstall SeaMonkey via winget?

Run: winget uninstall --id Mozilla.SeaMonkey --exact. Add --silent for unattended uninstalls. winget will use the registered uninstaller from SeaMonkey's Apps & Features entry.

Is SeaMonkey free?

SeaMonkey is distributed under MPL-2.0. Refer to the publisher (https://www.seamonkey-project.org/releases/) for the full license terms - Wingetly itself does not charge for installation.

Does SeaMonkey work on Windows 10?

Yes, as long as your Windows 10 build supports winget (1809 or newer). winget ships with App Installer on Windows 10/11 and pulls SeaMonkey directly from the publisher.

How do I keep SeaMonkey up to date?

Run winget upgrade --id Mozilla.SeaMonkey --exact, or winget upgrade --all to update everything winget tracks. We index 10 versions of SeaMonkey from microsoft/winget-pkgs.

Recent versions

2.53.23latest
2.53.22
2.53.21
2.53.20
2.53.19
2.53.18.2
2.53.18.1
2.53.16
2.53.13
2.53.12