How severe is CVE-2008-5506?

CVE-2008-5506 has a CVSS 2.0 base score of 6.8, rated medium severity.

Is CVE-2008-5506 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (79th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2008-5506?

CVE-2008-5506 primarily affects Mozilla Firefox. In total, 9 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2008-5506?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2008-5506 published?

CVE-2008-5506 was published on 2008-12-17 and last updated on 2026-06-16.

CVE-2008-5506

CVE-2008-5506 is a medium-severity vulnerability in Mozilla Firefox with a CVSS 2.0 base score of 6.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-264.

Key facts

Severity: Medium (CVSS 2.0 base score 6.8)
EPSS exploit prediction: 2% (79th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-264
Affected product: Mozilla Firefox
Published: 2008-12-17
Last modified: 2026-06-16

Description

Mozilla Firefox 3.x before 3.0.5 and 2.x before 2.0.0.19, Thunderbird 2.x before 2.0.0.19, and SeaMonkey 1.x before 1.1.14 allows remote attackers to bypass the same origin policy by causing the browser to issue an XMLHttpRequest to an attacker-controlled resource that uses a 302 redirect to a resource in a different domain, then reading content from the response, aka "response disclosure."

Frequently asked questions

What is CVE-2008-5506?: Mozilla Firefox 3.x before 3.0.5 and 2.x before 2.0.0.19, Thunderbird 2.x before 2.0.0.19, and SeaMonkey 1.x before 1.1.14 allows remote attackers to bypass the same origin policy by causing the browser to issue an XMLHttpRequest to an attacker-controlled resource that uses a 302 redirect to a resource in a different domain, then reading content from the response, aka "response disclosure."
How severe is CVE-2008-5506?: CVE-2008-5506 has a CVSS 2.0 base score of 6.8, rated medium severity.
Is CVE-2008-5506 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (79th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2008-5506?: CVE-2008-5506 primarily affects Mozilla Firefox. In total, 9 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2008-5506?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2008-5506 published?: CVE-2008-5506 was published on 2008-12-17 and last updated on 2026-06-16.

References

Affected products (9)

cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:seamonkey:*:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*
cpe:2.3:o:canonical:ubuntu_linux:6.06:*:*:*:lts:*:*:*
cpe:2.3:o:canonical:ubuntu_linux:7.10:*:*:*:*:*:*:*
cpe:2.3:o:canonical:ubuntu_linux:8.04:*:*:*:lts:*:*:*
cpe:2.3:o:canonical:ubuntu_linux:8.10:*:*:*:*:*:*:*
cpe:2.3:o:debian:debian_linux:4.0:*:*:*:*:*:*:*
cpe:2.3:o:debian:debian_linux:5.0:*:*:*:*:*:*:*

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