CVE-2026-8957 json
Privilege escalation in the Enterprise Policies component
published 2026-05-19 5 mo ago modified 2026-10-14 25 d ago also EUVD-2026-30908
- cvss
- 8.8
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.4%
- EPSS 0.4% chance of exploitation in 30 days, percentile 32%
- public exploits
- 0
- none known
Summary
Privilege escalation in the Enterprise Policies component. This vulnerability was fixed in Firefox 151, Firefox ESR 140.11, Thunderbird 151, and Thunderbird 140.11.
Patch / fix
- mozilla firefox 140.11.0, 151.0.0
- mozilla thunderbird 140.11, 151.0.0
- firefox-esr Debian 12 140.11.0esr-1~deb12u1
- firefox-esr Debian 13 140.11.0esr-1~deb13u1
- firefox-esr Debian 14 140.11.0esr-1
- thunderbird Debian 12 1:140.11.0esr-1~deb12u1
- thunderbird Debian 13 1:140.11.0esr-1~deb13u1
- thunderbird Debian 14 1:140.11.0esr-1
debian advisories DEBIAN-CVE-2026-8957
- thunderbird RHEL 8 140.11.0-1.el8_10
- thunderbird RHEL 10.2 140.11.0-1.el10_2
- thunderbird RHEL 9 140.11.0-1.el9_8
- firefox RHEL 8 140.11.0-1.el8_10
- firefox RHEL 9 140.11.0-1.el9_8
- firefox-x11 RHEL 9 140.11.0-1.el9_8
- firefox RHEL 10.2 140.11.0-1.el10_2
- firefox enterprise linux eus 10.0 140.11.0-1.el10_0
red hat advisories RHSA-2026:27715RHSA-2026:26629RHSA-2026:26630RHSA-2026:26606RHSA-2026:26551RHSA-2026:26539
- MozillaThunderbird openSUSE Leap 16.0 140.12.0-bp160.1.1
- MozillaFirefox openSUSE Tumbleweed 151.0.1-1.1
- MozillaThunderbird openSUSE Tumbleweed 140.11.1-1.1
- firefox-esr openSUSE Tumbleweed 140.11.0-1.1
opensuse advisories openSUSE-SU-2026:21168-1openSUSE-SU-2026:10863-1openSUSE-SU-2026:10864-1openSUSE-SU-2026:10813-1
- thunderbird AlmaLinux 8 140.11.0-1.el8_10.alma.1
- thunderbird AlmaLinux 10 140.11.0-1.el10_2.alma.1
- firefox AlmaLinux 9 140.11.0-1.el9_8.alma.1
- firefox-x11 AlmaLinux 9 140.11.0-1.el9_8.alma.1
- firefox AlmaLinux 10 140.11.0-1.el10_2
- thunderbird AlmaLinux 9 140.11.0-1.el9_8.alma.1
- firefox AlmaLinux 8 140.11.0-1.el8_10.alma.1
almalinux advisories ALSA-2026:22643ALSA-2026:22325ALSA-2026:21378ALSA-2026:21380ALSA-2026:21381ALSA-2026:21382
- thunderbird Rocky Linux 8 140.11.0-1.el8_10
- thunderbird Rocky Linux 10 140.11.0-1.el10_2
- firefox Rocky Linux 10 140.11.0-1.el10_2
- firefox Rocky Linux 9 140.11.0-1.el9_8
- thunderbird Rocky Linux 9 140.11.0-1.el9_8
- firefox Rocky Linux 8 140.11.0-1.el8_10
rocky linux advisories RLSA-2026:22643RLSA-2026:22325RLSA-2026:21380RLSA-2026:21378RLSA-2026:21381RLSA-2026:21382
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-2026-8957 updated cvss 6.1
firefox: Privilege escalation in the Enterprise Policies 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 140.11.0-1.el8_10, thunderbird 140.11.0-1.el8_10fixed: vendor fix RHSA-2026:21382
-
Red Hat Enterprise Linux AppStream (v. 9) firefox 140.11.0-1.el9_8, firefox-x11 140.11.0-1.el9_8, thunderbird 140.11.0-1.el9_8fixed: vendor fix RHSA-2026:21378
-
Red Hat Enterprise Linux AppStream (v. 10) firefox 140.11.0-1.el10_2, thunderbird 140.11.0-1.el10_2fixed: vendor fix RHSA-2026:21380
-
Red Hat Enterprise Linux AppStream AUS (v.8.4) firefox 140.11.0-1.el8_4, thunderbird 140.11.0-1.el8_4fixed: vendor fix RHSA-2026:26629
-
Red Hat Enterprise Linux AppStream AUS (v.8.6) firefox 140.11.0-1.el8_6, thunderbird 140.11.0-1.el8_6fixed: vendor fix RHSA-2026:26606
-
Red Hat Enterprise Linux AppStream E4S (v.8.8) firefox 140.11.0-1.el8_8, thunderbird 140.11.0-1.el8_8fixed: vendor fix RHSA-2026:26630
show 8 moreshow fewer
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Red Hat Enterprise Linux AppStream E4S (v.9.2) firefox 140.11.0-1.el9_2, firefox-x11 140.11.0-1.el9_2, thunderbird 140.11.0-1.el9_2fixed: vendor fix RHSA-2026:26491
-
Red Hat Enterprise Linux AppStream E4S (v.9.4) firefox 140.11.0-1.el9_4, firefox-x11 140.11.0-1.el9_4, thunderbird 140.11.0-1.el9_4fixed: vendor fix RHSA-2026:26493
-
Red Hat Enterprise Linux AppStream EUS (v. 10.0) firefox 140.11.0-1.el10_0, thunderbird 140.11.0-1.el10_0fixed: vendor fix RHSA-2026:27715
-
Red Hat Enterprise Linux AppStream EUS (v.9.6) firefox 140.11.0-1.el9_6, firefox-x11 140.11.0-1.el9_6, thunderbird 140.11.0-1.el9_6fixed: vendor fix RHSA-2026:26492
-
Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4) firefox 140.11.0-1.el8_4, thunderbird 140.11.0-1.el8_4fixed: vendor fix RHSA-2026:26629
-
Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.6) firefox 140.11.0-1.el8_6, thunderbird 140.11.0-1.el8_6fixed: vendor fix RHSA-2026:26606
-
Red Hat Enterprise Linux AppStream TUS (v.8.8) firefox 140.11.0-1.el8_8, thunderbird 140.11.0-1.el8_8fixed: vendor fix RHSA-2026:26630
-
Red Hat Enterprise Linux Server (v. 7 ELS) firefox 140.11.0-1.el7_9fixed: vendor fix RHSA-2026:26551
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
- 5 mo ago
Exploit prediction
0.39% chance of exploitation in the next 30 days, higher than 32% 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/mfsa2026-46/
vendor-advisory
-
mozilla.org
/security/advisories/mfsa2026-48/
vendor-advisory
-
mozilla.org
/security/advisories/mfsa2026-50/
vendor-advisory
-
mozilla.org
/security/advisories/mfsa2026-51/
vendor-advisory
-
bugzilla.mozilla.org
/show_bug.cgi?id=2033850
permissions-required
Sources
- CVE List CVE-2026-8957
- NVD CVE-2026-8957
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