How severe is CVE-2024-9393?

CVE-2024-9393 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2024-9393 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (31st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2024-9393?

CVE-2024-9393 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-2024-9393?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2024-9393 have an EU (EUVD) identifier?

Yes. CVE-2024-9393 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2024-49908.

When was CVE-2024-9393 published?

CVE-2024-9393 was published on 2024-10-01 and last updated on 2026-06-17.

CVE-2024-9393

CVE-2024-9393 is a high-severity vulnerability in Mozilla Firefox with a CVSS 3.x base score of 7.5. 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-346.

Key facts

Severity: High (CVSS 3.x base score 7.5)
EPSS exploit prediction: 0% (31st percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2024-49908
Weakness: CWE-346
Affected product: Mozilla Firefox
Published: 2024-10-01
Last modified: 2026-06-17

Description

An attacker could, via a specially crafted multipart response, execute arbitrary JavaScript under the `resource://pdf.js` origin. This could allow them to access cross-origin PDF content. This access is limited to "same site" documents by the Site Isolation feature on desktop clients, but full cross-origin access is possible on Android versions. This vulnerability affects Firefox < 131, Firefox ESR < 128.3, Firefox ESR < 115.16, Thunderbird < 128.3, and Thunderbird < 131.

Frequently asked questions

What is CVE-2024-9393?: An attacker could, via a specially crafted multipart response, execute arbitrary JavaScript under the `resource://pdf.js` origin. This could allow them to access cross-origin PDF content. This access is limited to "same site" documents by the Site Isolation feature on desktop clients, but full cross-origin access is possible on Android versions. This vulnerability affects Firefox < 131, Firefox ESR < 128.3, Firefox ESR < 115.16, Thunderbird < 128.3, and Thunderbird < 131.
How severe is CVE-2024-9393?: CVE-2024-9393 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2024-9393 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (31st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2024-9393?: CVE-2024-9393 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-2024-9393?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2024-9393 have an EU (EUVD) identifier?: Yes. CVE-2024-9393 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2024-49908.
When was CVE-2024-9393 published?: CVE-2024-9393 was published on 2024-10-01 and last updated on 2026-06-17.

References

Affected products (9)

cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:firefox_esr:*:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:thunderbird:129.0:beta:*:*:*:*:*:*
cpe:2.3:a:mozilla:thunderbird:129.0:beta2:*:*:*:*:*:*
cpe:2.3:a:mozilla:thunderbird:129.0:beta3:*:*:*:*:*:*
cpe:2.3:a:mozilla:thunderbird:129.0:beta4:*:*:*:*:*:*
cpe:2.3:a:mozilla:thunderbird:129.0:beta5:*:*:*:*:*:*
cpe:2.3:a:mozilla:thunderbird:129.0:beta6:*:*:*:*:*:*

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