CVE-2024-9393: An attacker could, via a specially crafted multipart response, execute arbitrary JavaScript under the
Source GCVE Database
Not known to be exploited · CVSS 7.5 High · fixed in 131 : patch Firefox soon.
Data as of 29 Oct 2026, 22:52 UTC
Thin evidence
One scorer or none| CISA-ADP | CVSS 3.1 | 7.5 |
|---|
- 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:NExploitation evidence
Disclosed: evidence found.
CVE published 1 Oct 2024
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by 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
| Product | Affected | Fixed in |
|---|---|---|
Ubuntuubuntu/firefoxpkg:deb/ubuntu/firefoxOther threats | Affected
| Fixed in
|
Ubuntuubuntu/thunderbirdpkg:deb/ubuntu/thunderbirdOther threats | Affected
| Fixed in
|
Ubuntuubuntu/firefox-esrpkg:deb/ubuntu/firefox-esrOther threats | Affected
| Fixed in
|
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
- nvd.nist.gov/vuln/detail/CVE-2024-9393 (opens in a new tab)
- bugzilla.mozilla.org/show_bug.cgi?id=1918301 (opens in a new tab)
- lists.debian.org/debian-lts-announce/2024/10/msg00004.html (opens in a new tab)
- lists.debian.org/debian-lts-announce/2024/10/msg00006.html (opens in a new tab)
- mozilla.org/security/advisories/mfsa2024-46 (opens in a new tab)
- mozilla.org/security/advisories/mfsa2024-47 (opens in a new tab)
- mozilla.org/security/advisories/mfsa2024-48 (opens in a new tab)
- mozilla.org/security/advisories/mfsa2024-49 (opens in a new tab)
- mozilla.org/security/advisories/mfsa2024-50 (opens in a new tab)