CVE-2026-92015 json
Privilege escalation in the WebExtensions component
published 2026-09-15 54 d ago modified 2026-10-06 33 d ago also EUVD-2026-78478
- cvss
- 8.8
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.3%
- EPSS 0.3% chance of exploitation in 30 days, percentile 17%
- public exploits
- 0
- none known
Summary
Privilege escalation in the WebExtensions component. This vulnerability was fixed in Firefox 156, Firefox ESR 115.41, Firefox ESR 140.16, Firefox ESR 153.3, Thunderbird 156, Thunderbird 140.16, and Thunderbird 153.3.
Patch / fix
- mozilla firefox 115.41.0, 140.16.0, 153.3.0, 156.0.0
- mozilla thunderbird 140.16.0, 153.3.0, 156.0
- firefox-esr Debian 12 140.16.0esr-1~deb12u1
- firefox-esr Debian 13 140.16.0esr-1~deb13u1
- firefox-esr Debian 14 140.16.0esr-1
- thunderbird Debian 12 1:140.16.0esr-1~deb12u1
- thunderbird Debian 13 1:140.16.0esr-1~deb13u1
- thunderbird Debian 14 1:153.3.0esr-1
debian advisories DEBIAN-CVE-2026-92015
- thunderbird RHEL 8 140.16.0-1.el8_10
- thunderbird RHEL 10.2 140.16.0-1.el10_2
- firefox RHEL 8 140.16.0-1.el8_10
- thunderbird RHEL 9 140.16.0-1.el9_8
- firefox RHEL 9 140.16.0-1.el9_8
- firefox-x11 RHEL 9 140.16.0-1.el9_8
- firefox RHEL 10.2 140.16.0-1.el10_2
- firefox RHEL 7 ELS 140.16.0-1.el7_9
red hat advisories RHSA-2026:83496RHSA-2026:83077RHSA-2026:83076RHSA-2026:82818RHSA-2026:82817RHSA-2026:82779
- MozillaThunderbird SLE Workstation Extension 15 SP7, SLE Module for Package Hub 15 SP7 153.4.0-150400.13.6.1
- MozillaFirefox SLES for SAP applications 16.0, SLES 16.0 153.3.0-160000.1.1
- MozillaFirefox SLES for SAP 15 SP6, SLES for SAP 15 SP5, SLES for SAP 15 SP4 +8 more 153.3.0-150400.157.8.1
- MozillaFirefox SLES LTSS Extended Security 12 SP5, SLES 12 SP5-LTSS 153.3.0-118.8.1
suse advisories SUSE-SU-2026:4627-1SUSE-SU-2026:23918-1SUSE-SU-2026:4264-1SUSE-SU-2026:4247-1
- MozillaFirefox openSUSE Leap 16.0 153.3.0-160000.1.1
- MozillaFirefox openSUSE Tumbleweed 156.0-1.1
- MozillaThunderbird openSUSE Tumbleweed 140.16.0-1.1
- firefox-esr openSUSE Tumbleweed 153.3.0-1.1
opensuse advisories openSUSE-SU-2026:21951-1openSUSE-SU-2026:11826-1openSUSE-SU-2026:11827-1openSUSE-SU-2026:11796-1
- thunderbird AlmaLinux 8 140.16.0-1.el8_10.alma.1
- thunderbird AlmaLinux 10 140.16.0-1.el10_2.alma.1
- firefox AlmaLinux 8 140.16.0-1.el8_10.alma.1
- thunderbird AlmaLinux 9 140.16.0-1.el9_8.alma.1
- firefox AlmaLinux 10 140.16.0-1.el10_2
- firefox AlmaLinux 9 140.16.0-1.el9_8.alma.1
- firefox-x11 AlmaLinux 9 140.16.0-1.el9_8.alma.1
almalinux advisories ALSA-2026:73971ALSA-2026:73130ALSA-2026:71652ALSA-2026:70642ALSA-2026:69461ALSA-2026:69462
- thunderbird Rocky Linux 8 140.16.0-1.el8_10
- thunderbird Rocky Linux 10 140.16.0-1.el10_2
- firefox Rocky Linux 8 140.16.0-1.el8_10
- thunderbird Rocky Linux 9 140.16.0-1.el9_8
- firefox Rocky Linux 9 140.16.0-1.el9_8
- firefox Rocky Linux 10 140.16.0-1.el10_2
rocky linux advisories RLSA-2026:73971RLSA-2026:73130RLSA-2026:71652RLSA-2026:70642RLSA-2026:69462RLSA-2026:69461
Vendor advisories
What the vendors themselves say about their products: affected, fixed or not affected, and what to do.
red hat product security vex CVE-2026-92015 updated cvss 7.5
firefox: thunderbird: Privilege escalation in the WebExtensions component
-
Red Hat Enterprise Linux 6 firefox, thunderbird Red Hat Enterprise Linux 7 thunderbirdaffected: no fix planned “Out of support scope”
-
Red Hat Enterprise Linux 10 rhel10/firefox-flatpak, rhel10/thunderbird-flatpakaffected: no fix available
-
Red Hat Enterprise Linux AppStream (v. 8) firefox 140.16.0-1.el8_10, thunderbird 140.16.0-1.el8_10fixed: vendor fix RHSA-2026:71652
-
Red Hat Enterprise Linux AppStream (v. 9) firefox 140.16.0-1.el9_8, firefox-x11 140.16.0-1.el9_8, thunderbird 140.16.0-1.el9_8fixed: vendor fix RHSA-2026:69462
-
Red Hat Enterprise Linux AppStream (v. 10) firefox 140.16.0-1.el10_2, thunderbird 140.16.0-1.el10_2fixed: vendor fix RHSA-2026:69461
-
Red Hat Enterprise Linux AppStream AUS (v.8.4) firefox 140.16.0-1.el8_4, thunderbird 140.16.0-1.el8_4fixed: vendor fix RHSA-2026:82779
-
Red Hat Enterprise Linux AppStream AUS (v.8.6) firefox 140.16.0-1.el8_6, thunderbird 140.16.0-1.el8_6fixed: vendor fix RHSA-2026:83076
-
Red Hat Enterprise Linux AppStream E4S (v.8.8) firefox 140.16.0-1.el8_8, thunderbird 140.16.0-1.el8_8fixed: vendor fix RHSA-2026:82720
show 8 moreshow fewer
-
Red Hat Enterprise Linux AppStream E4S (v.9.2) firefox 140.16.0-1.el9_2, firefox-x11 140.16.0-1.el9_2, thunderbird 140.16.0-1.el9_2fixed: vendor fix RHSA-2026:82780
-
Red Hat Enterprise Linux AppStream E4S (v.9.4) firefox 140.16.0-1.el9_4, firefox-x11 140.16.0-1.el9_4, thunderbird 140.16.0-1.el9_4fixed: vendor fix RHSA-2026:83077
-
Red Hat Enterprise Linux AppStream EUS (v. 10.0) firefox 140.16.0-1.el10_0, thunderbird 140.16.0-1.el10_0fixed: vendor fix RHSA-2026:82818
-
Red Hat Enterprise Linux AppStream EUS (v.9.6) firefox 140.16.0-1.el9_6, firefox-x11 140.16.0-1.el9_6, thunderbird 140.16.0-1.el9_6fixed: vendor fix RHSA-2026:82817
-
Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4) firefox 140.16.0-1.el8_4, thunderbird 140.16.0-1.el8_4fixed: vendor fix RHSA-2026:82779
-
Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.6) firefox 140.16.0-1.el8_6, thunderbird 140.16.0-1.el8_6fixed: vendor fix RHSA-2026:83076
-
Red Hat Enterprise Linux AppStream TUS (v.8.8) firefox 140.16.0-1.el8_8, thunderbird 140.16.0-1.el8_8fixed: vendor fix RHSA-2026:82720
-
Red Hat Enterprise Linux Server (v. 7 ELS) firefox 140.16.0-1.el7_9fixed: vendor fix RHSA-2026:83496
Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- total
- Assessed
- 55 d ago
Exploit prediction
0.26% chance of exploitation in the next 30 days, higher than 17% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CISA ADP | 3.1 | 8.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H |
| CNA | 3.1 | 8.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H |
Affected products
- Mozilla Firefox
- Mozilla Thunderbird
Classification
- Weakness
-
- CWE-269 Improper Privilege Management
References
-
mozilla.org
/security/advisories/mfsa2026-90/
vendor-advisory
-
mozilla.org
/security/advisories/mfsa2026-91/
vendor-advisory
-
mozilla.org
/security/advisories/mfsa2026-92/
vendor-advisory
-
mozilla.org
/security/advisories/mfsa2026-93/
vendor-advisory
-
mozilla.org
/security/advisories/mfsa2026-94/
vendor-advisory
-
mozilla.org
/security/advisories/mfsa2026-95/
vendor-advisory
-
mozilla.org
/security/advisories/mfsa2026-96/
vendor-advisory
-
bugzilla.mozilla.org
/show_bug.cgi?id=2060235
permissions-required
Sources
- CVE List CVE-2026-92015
- NVD CVE-2026-92015
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