How severe is CVE-2008-4723?

CVE-2008-4723 has a CVSS 2.0 base score of 4.3, rated medium severity.

Is CVE-2008-4723 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (53rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2008-4723?

CVE-2008-4723 primarily affects Mozilla Firefox. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2008-4723?

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

When was CVE-2008-4723 published?

CVE-2008-4723 was published on 2008-10-23 and last updated on 2026-06-16.

CVE-2008-4723

CVE-2008-4723 is a medium-severity vulnerability in Mozilla Firefox with a CVSS 2.0 base score of 4.3. 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-79.

Key facts

Severity: Medium (CVSS 2.0 base score 4.3)
EPSS exploit prediction: 1% (53rd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Mozilla Firefox
Published: 2008-10-23
Last modified: 2026-06-16

Description

Multiple cross-site scripting (XSS) vulnerabilities in Mozilla Firefox 3.0.1 through 3.0.3 allow remote attackers to inject arbitrary web script or HTML via an ftp:// URL for an HTML document within a (1) JPG, (2) PDF, or (3) TXT file. NOTE: the provenance of this information is unknown; the details are obtained solely from third party information.

Frequently asked questions

What is CVE-2008-4723?: Multiple cross-site scripting (XSS) vulnerabilities in Mozilla Firefox 3.0.1 through 3.0.3 allow remote attackers to inject arbitrary web script or HTML via an ftp:// URL for an HTML document within a (1) JPG, (2) PDF, or (3) TXT file. NOTE: the provenance of this information is unknown; the details are obtained solely from third party information.
How severe is CVE-2008-4723?: CVE-2008-4723 has a CVSS 2.0 base score of 4.3, rated medium severity.
Is CVE-2008-4723 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (53rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2008-4723?: CVE-2008-4723 primarily affects Mozilla Firefox. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2008-4723?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2008-4723 published?: CVE-2008-4723 was published on 2008-10-23 and last updated on 2026-06-16.

References

http://www.securityfocus.com/bid/31855

Affected products (3)

cpe:2.3:a:mozilla:firefox:3.0.1:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:firefox:3.0.2:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:firefox:3.0.3:*:*:*:*:*:*:*

More vulnerabilities in Mozilla Firefox

CVE-2026-4725 — Critical (CVSS 10.0): Sandbox escape due to use-after-free in the Graphics: Canvas2D component. This vulnerability was fixed in Firefox 149…
CVE-2026-4692 — Critical (CVSS 10.0): Sandbox escape in the Responsive Design Mode component. This vulnerability was fixed in Firefox 149, Firefox ESR…
CVE-2026-4689 — Critical (CVSS 10.0): Sandbox escape due to incorrect boundary conditions, integer overflow in the XPCOM component. This vulnerability was…
CVE-2026-4688 — Critical (CVSS 10.0): Sandbox escape due to use-after-free in the Disability Access APIs component. This vulnerability was fixed in Firefox…
CVE-2026-2778 — Critical (CVSS 10.0): Sandbox escape due to incorrect boundary conditions in the DOM: Core & HTML component. This vulnerability was fixed in…
CVE-2026-2776 — Critical (CVSS 10.0): Sandbox escape due to incorrect boundary conditions in the Telemetry component in External Software. This vulnerability…

All CVEs affecting Mozilla Firefox →

Other CWE-79 (Cross-site Scripting (XSS)) vulnerabilities

CVE-2025-49410 — Critical (CVSS 10.0): Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Imran Emu TC…
CVE-2024-47875 — Critical (CVSS 10.0): DOMPurify is a DOM-only, super-fast, uber-tolerant XSS sanitizer for HTML, MathML and SVG. DOMpurify was vulnerable to…
CVE-2024-6886 — Critical (CVSS 10.0): Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') vulnerability in Gitea…
CVE-2023-45144 — Critical (CVSS 10.0): com.xwiki.identity-oauth:identity-oauth-ui is a package to aid in building identity and service providers based on…
CVE-2023-45138 — Critical (CVSS 10.0): Change Request is an pplication allowing users to request changes on a wiki without publishing the changes directly.…
CVE-2022-4361 — Critical (CVSS 10.0): Keycloak, an open-source identity and access management solution, has a cross-site scripting (XSS) vulnerability in the…

Browse all CWE-79 (Cross-site Scripting (XSS)) vulnerabilities →