CVE-2026-0883

23

FAUCET Score

CVE-2026-0883 is an information disclosure vulnerability within the Networking component of Mozilla Firefox (versions prior to 147 and ESR prior to 140.7) and Thunderbird (versions prior to 147 and 140.7). This medium-severity vulnerability (CVSS 5.3) can be exploited remotely without user interaction, potentially leading to the leakage of sensitive information. While there is no evidence of active exploitation or public exploit code (Metasploit, Nuclei, ExploitDB), the vulnerability has garnered significant community discussion, with 10 mentions, indicating awareness among security researchers.

Impacted Technologies

Vendor	Product	Version(s)	CPE
		< 140.7.0CPE matchmatch criteria	cpe:2.3:a:mozilla:firefox:::::esr:::*
		< 147.0CPE matchmatch criteria	cpe:2.3:a:mozilla:firefox:::::-:::*
		< 140.7.0CPE matchmatch criteria	cpe:2.3:a:mozilla:thunderbird:::::esr:::*
		< 147.0CPE matchmatch criteria	cpe:2.3:a:mozilla:thunderbird:::::-:::*

CVSS Data

CVSS version used by this source: 3.1

5.3MEDIUM

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

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

LOW

Integrity Impact

NONE

Availability Impact

NONE

Exploitability Score

3.9

Impact Score

1.4

CvssVersion

3.1

Exploit Intelligence

EPSS Score

0.41%

Probability of exploitation in next 30 days

EPSS Percentile

33.6%

Percentile rank of EPSS score among Peer Group

As of 2026-07-27

Model: v2026.06.15

This CVE's current EPSS score of 0.0041 is in the 21st percentile among its peer group of 23,725 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

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

Remediation

Patch Available

Vendor Patches (36)

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 10Fixed in: firefox-0:140.7.0-1.el10_1

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 10Fixed in: thunderbird-0:140.7.0-1.el10_1

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 10.0 Extended Update SupportFixed in: firefox-0:140.7.0-1.el10_0

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 10.0 Extended Update SupportFixed in: thunderbird-0:140.7.0-1.el10_0

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 7 Extended Lifecycle SupportFixed in: firefox-0:140.7.0-1.el7_9

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 8Fixed in: firefox-0:140.7.0-1.el8_10

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 8Fixed in: thunderbird-0:140.7.0-1.el8_10

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 8.2 Advanced Update SupportFixed in: thunderbird-0:140.7.0-1.el8_2

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 8.2 Advanced Update SupportFixed in: firefox-0:140.7.0-1.el8_2

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update SupportFixed in: thunderbird-0:140.7.0-1.el8_4

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update SupportFixed in: firefox-0:140.7.0-1.el8_4

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-OnFixed in: thunderbird-0:140.7.0-1.el8_4

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-OnFixed in: firefox-0:140.7.0-1.el8_4

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update SupportFixed in: thunderbird-0:140.7.0-1.el8_6

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update SupportFixed in: firefox-0:140.7.0-1.el8_6

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 8.6 Telecommunications Update ServiceFixed in: thunderbird-0:140.7.0-1.el8_6

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 8.6 Telecommunications Update ServiceFixed in: firefox-0:140.7.0-1.el8_6

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 8.6 Update Services for SAP SolutionsFixed in: thunderbird-0:140.7.0-1.el8_6

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 8.6 Update Services for SAP SolutionsFixed in: firefox-0:140.7.0-1.el8_6

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 8.8 Telecommunications Update ServiceFixed in: thunderbird-0:140.7.0-1.el8_8

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 8.8 Telecommunications Update ServiceFixed in: firefox-0:140.7.0-1.el8_8

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 8.8 Update Services for SAP SolutionsFixed in: thunderbird-0:140.7.0-1.el8_8

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 8.8 Update Services for SAP SolutionsFixed in: firefox-0:140.7.0-1.el8_8

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 9Fixed in: firefox-0:140.7.0-1.el9_7

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 9Fixed in: thunderbird-0:140.7.0-1.el9_7

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 9.0 Update Services for SAP SolutionsFixed in: thunderbird-0:140.7.0-1.el9_0

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 9.0 Update Services for SAP SolutionsFixed in: firefox-0:140.7.0-1.el9_0

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 9.2 Update Services for SAP SolutionsFixed in: thunderbird-0:140.7.0-1.el9_2

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 9.2 Update Services for SAP SolutionsFixed in: firefox-0:140.7.0-1.el9_2

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 9.4 Extended Update SupportFixed in: thunderbird-0:140.7.0-1.el9_4

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 9.4 Extended Update SupportFixed in: firefox-0:140.7.0-1.el9_4

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 9.6 Extended Update SupportFixed in: thunderbird-0:140.7.0-2.el9_6

redhatpatch availablevia redhat_api

Product: Red Hat Enterprise Linux 9.6 Extended Update SupportFixed in: firefox-0:140.7.0-1.el9_6

mozillavendor investigatingvia nvd_reference

redhatno patchvia redhat_api

Product: Red Hat Enterprise Linux 10Fixed in: rhel10/firefox-flatpak

redhatno patchvia redhat_api

Product: Red Hat Enterprise Linux 10Fixed in: rhel10/thunderbird-flatpak

Vendor Advisories (1)

redhatCVE-2026-0883Moderate

firefox: thunderbird: Information disclosure in the Networking component

References

bugzilla.mozilla.org / show_bug.cgi

Permissions Required

mozilla.org / security/advisories/mfsa2026-01

Vendor Advisory

mozilla.org / security/advisories/mfsa2026-03

Vendor Advisory

mozilla.org / security/advisories/mfsa2026-04

Vendor Advisory

mozilla.org / security/advisories/mfsa2026-05

Vendor Advisory