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5.0
CVE-1999-0809: Netscape Communicator 4.x may accept cross-site cookies
CVE-1999-0809 · published 27 years ago
Summary
When JavaScript is turned on, Netscape Communicator 4.x can ignore the setting that should block cookies from other websites. This means the browser may store tracking information from sites you didn’t intend to share with. Turn off JavaScript or upgrade to a newer browser to keep cookie handling under control.
What to do
The CVE record does not list a fixed version. Check the vendor's site or the advisory links below - a fix may already be released.
Affected software
| Vendor | Product | Affected versions |
|---|---|---|
| netscape | communicator |
4.0 cpe:2.3:a:netscape:communicator:4.0:*:*:*:*:*:*:* |
Original advisory text
Netscape Communicator 4.x with Javascript enabled does not warn a user of cookie settings, even if they have selected the option to "Only accept cookies originating from the same server as the page...
Netscape Communicator 4.x with Javascript enabled does not warn a user of cookie settings, even if they have selected the option to "Only accept cookies originating from the same server as the page being viewed".
Internet-facing
14 days
Internal
60 days
- Not known to be exploited
- Can be exploited automatically (estimated)
- Gives an attacker partial control (estimated)
Severity
5.0
Medium
Timeline
Published9 Jul 1999
Updated4 Nov 2026
First seen29 Sep 2026
Sources
CVE-1999-0809 · NVD
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