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VulnerabilityPublished Updated

CVE-2024-9393: An attacker could, via a specially crafted multipart response, execute arbitrary JavaScript under the

Source GCVE Database

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Authoritative record:CVE-2024-9393· High 7.5

Not known to be exploited · CVSS 7.5 High · fixed in 131 : patch Firefox soon.

Data as of 29 Oct 2026, 22:52 UTC

CVSS 3.1 base score
7.5High
How severe the flaw is on the 0–10 CVSS scale.

Thin evidence

One scorer or none
CVSS scores by source
CISA-ADPCVSS 3.17.5
Patch
Available – fixed in 131, 128.3, 115.16
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 1 Oct 2024

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 29 Oct 2026.

What to do

Upgrade the Ubuntu to 131 (ubuntu/firefox package); 131 or 128.3 (ubuntu/thunderbird package); 128.3 or 115.16 (ubuntu/firefox-esr package).

Affected software

ProductAffectedFixed in
Ubuntuubuntu/firefoxpkg:deb/ubuntu/firefoxOther threatsAffected
  • <131
Fixed in
  • 131
Ubuntuubuntu/thunderbirdpkg:deb/ubuntu/thunderbirdOther threatsAffected
  • <128.3
  • <131
Fixed in
  • 128.3
  • 131
Ubuntuubuntu/firefox-esrpkg:deb/ubuntu/firefox-esrOther threatsAffected
  • <128.3
  • <115.16
Fixed in
  • 128.3
  • 115.16

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

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.

References

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