CVE-2006-6503

6.8 MEDIUM 4% exploit odds Fix listed

What it is

Mozilla Firefox 2.x before 2.0.0.1, 1.5.x before 1.5.0.9, Thunderbird before 1.5.0.9, and SeaMonkey before 1.0.7 allows remote attackers to bypass cross-site scripting (XSS) protection by changing the src attribute of an IMG element to a javascript: URI.

At a glance

Exploitability: Can be exploited over the network without logging in. Limited direct impact.
Exploit odds: 4.2% chance of exploitation in the next 30 days (EPSS).
Fix: A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

2006-12-20 01:28 UTC PublishedDisclosed publicly on CVE.org and NVD
2026-06-16 22:33 UTC Last updatedMost recent change to the record

Why it ranks here

Exploited in the wild: no, CISA does not list it.
Exploit odds: 4.2% in the next 30 days (EPSS).
Severity: 6.8 MEDIUM (CVSS).
Fix: a patch or advisory is linked.

Details

Published: 2006-12-20 01:28 UTC
Last modified: 2026-06-16 22:33 UTC
Exploit probability: 4.2% · EPSS, next 30 days
Weakness: CWE-254
Record status: Modified

Affected

Mozilla Firefox < 1.5.0.9
Mozilla Firefox < 2.0.0.1
Mozilla Seamonkey < 1.0.7
Mozilla Thunderbird < 1.5.0.9
Debian Linux 3.1
Debian Linux 4.0
Canonical Ubuntu Linux 5.10
Canonical Ubuntu Linux 6.06

Attack profile CVSS 2.0 · 6.8

Attack vector: Network
Complexity: Medium
Authentication: None
Confidentiality: Partial
Integrity: Partial
Availability: Partial

Raw vector

AV:N/AC:M/Au:N/C:P/I:P/A:P

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2006-6503.md and follow it. Check whether this project is affected by CVE-2006-6503. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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Fix and advisories

References

NVD record · CVE.org record