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CVE-2025-4083

27
FAUCET Score

CVE-2025-4083 is a critical process isolation vulnerability in Mozilla Firefox and Thunderbird, affecting versions prior to Firefox 138, Firefox ESR 128.10, Firefox ESR 115.23, Thunderbird 138, and Thunderbird 128.10. This flaw allows javascript: URIs to execute in the top-level document's process instead of an isolated frame, potentially leading to a sandbox escape. With a CVSS score of 9.1 (CRITICAL), it presents a high risk of complete compromise (confidentiality, integrity) without user interaction. There is currently no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion beyond a single mention.

Impacted Technologies

VendorProductVersion(s)CPE
< 115.23CPE matchmatch criteria
cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:*
< 138.0CPE matchmatch criteria
cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:*
>= 128.0, < 128.10CPE matchmatch criteria
cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:*
< 128.10.0CPE matchmatch criteria
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:esr:*:*:*
< 138.0CPE matchmatch criteria
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:-:*:*:*

CVSS Data

CVSS version used by this source: 3.1

9.1CRITICAL

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
NONE
Exploitability Score
3.9
Impact Score
5.2
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.40%
Probability of exploitation in next 30 days
EPSS Percentile
32.6%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0040 is in the 9th percentile among its peer group of 36,897 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (35)

redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 10Fixed in: firefox-0:128.10.0-1.el10_0
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 10Fixed in: thunderbird-0:128.10.0-1.el10_0
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7 Extended Lifecycle SupportFixed in: firefox-0:128.10.0-1.el7_9
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8Fixed in: firefox-0:128.10.0-1.el8_10
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8Fixed in: thunderbird-0:128.10.0-1.el8_10
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8.2 Advanced Update SupportFixed in: firefox-0:128.10.0-1.el8_2
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8.2 Advanced Update SupportFixed in: thunderbird-0:128.10.0-1.el8_2
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update SupportFixed in: firefox-0:128.10.0-1.el8_4
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update SupportFixed in: thunderbird-0:128.10.0-1.el8_4
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8.4 Telecommunications Update ServiceFixed in: firefox-0:128.10.0-1.el8_4
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8.4 Telecommunications Update ServiceFixed in: thunderbird-0:128.10.0-1.el8_4
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8.4 Update Services for SAP SolutionsFixed in: firefox-0:128.10.0-1.el8_4
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8.4 Update Services for SAP SolutionsFixed in: thunderbird-0:128.10.0-1.el8_4
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update SupportFixed in: firefox-0:128.10.0-1.el8_6
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update SupportFixed in: thunderbird-0:128.10.0-1.el8_6
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8.6 Telecommunications Update ServiceFixed in: firefox-0:128.10.0-1.el8_6
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8.6 Telecommunications Update ServiceFixed in: thunderbird-0:128.10.0-1.el8_6
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8.6 Update Services for SAP SolutionsFixed in: firefox-0:128.10.0-1.el8_6
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8.6 Update Services for SAP SolutionsFixed in: thunderbird-0:128.10.0-1.el8_6
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8.8 Extended Update SupportFixed in: firefox-0:128.10.0-1.el8_8
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8.8 Extended Update SupportFixed in: thunderbird-0:128.10.0-1.el8_8
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 9Fixed in: firefox-0:128.10.0-1.el9_5
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 9Fixed in: thunderbird-0:128.10.0-1.el9_5
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 9Fixed in: firefox-0:128.10.0-1.el9_6
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 9.0 Update Services for SAP SolutionsFixed in: firefox-0:128.10.0-1.el9_0
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 9.0 Update Services for SAP SolutionsFixed in: thunderbird-0:128.10.0-1.el9_0
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 9.2 Extended Update SupportFixed in: firefox-0:128.10.0-1.el9_2
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 9.2 Extended Update SupportFixed in: thunderbird-0:128.10.0-1.el9_2
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 9.4 Extended Update SupportFixed in: firefox-0:128.10.0-1.el9_4
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 9.4 Extended Update SupportFixed in: thunderbird-0:128.10.0-1.el9_4
View patch
mozillavendor investigatingvia nvd_reference
View patch
redhatno patchvia redhat_api
Product: Red Hat Enterprise Linux 10Fixed in: firefox-flatpak-container
redhatno patchvia redhat_api
Product: Red Hat Enterprise Linux 10Fixed in: thunderbird-flatpak-container
redhatno patchvia redhat_api
Product: Red Hat Enterprise Linux 9Fixed in: firefox-flatpak-container
redhatno patchvia redhat_api
Product: Red Hat Enterprise Linux 9Fixed in: thunderbird-flatpak-container

Vendor Advisories (1)

redhatCVE-2025-4083Important

firefox: thunderbird: Process isolation bypass using "javascript:" URI links in cross-origin frames

Apr 29, 2025

References

lists.debian.org / debian-lts-announce/2025/05/msg00024.html
bugzilla.mozilla.org / show_bug.cgi
Permissions Required
mozilla.org / security/advisories/mfsa2025-28
Vendor Advisory
mozilla.org / security/advisories/mfsa2025-29
Vendor Advisory
mozilla.org / security/advisories/mfsa2025-30
Vendor Advisory
mozilla.org / security/advisories/mfsa2025-31
Vendor Advisory
mozilla.org / security/advisories/mfsa2025-32
Vendor Advisory