CVE-2024-9393

Name: CVE-2024-9393
Creator: NVD / NIST
Published: 2024-10-01T16:15:10.623+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 0.40%

Last modified Jun 17, 2026

CVE-2024-9393 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. 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. EPSS estimates a 0.40% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

7.5/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

EPSS Probability

0.40%

32.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-346

Affected Software

Vendor	Product	Versions	Update
Mozilla	Firefox	< 131.0	—
Mozilla	Firefox Esr	< 115.16.0	—
Mozilla	Firefox Esr	>= 116.0, < 128.3.0	—
Mozilla	Thunderbird	< 128.3	—
Mozilla	Thunderbird	129.0	Beta

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1918301Permissions Required
https://www.mozilla.org/security/advisories/mfsa2024-46/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2024-47/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2024-48/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2024-49/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2024-50/Vendor Advisory
https://lists.debian.org/debian-lts-announce/2024/10/msg00004.html
https://lists.debian.org/debian-lts-announce/2024/10/msg00006.html

Timeline

Published: Oct 1, 2024
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2024-9393?

How severe is CVE-2024-9393?

CVE-2024-9393 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 0.40% probability of exploitation in the next 30 days.

How do I fix CVE-2024-9393?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2024-9393?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST