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Fencer Vulns
high 8.1

CVE-2025-10534 json

Spoofing issue in the Site Permissions component

published 2025-09-16 13 mo ago modified 2026-10-18 21 d ago also EUVD-2025-29554

cvss
8.1
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 29%
public exploits
0
none known

Summary

Spoofing issue in the Site Permissions component. This vulnerability was fixed in Firefox 143 and Thunderbird 143.

Patch / fix

  • mozilla firefox 143
  • mozilla firefox_esr 143
  • mozilla thunderbird 143
  • mozilla thunderbird_esr 143
  • firefox-esr openSUSE Tumbleweed 153.0-1.1
  • MozillaFirefox openSUSE Tumbleweed 143.0-1.1

opensuse advisories openSUSE-SU-2026:11373-1openSUSE-SU-2025:15565-1

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-2025-10534 updated cvss 3.4

firefox: Spoofing issue in the Site Permissions component

  • Red Hat Enterprise Linux 9 firefox, firefox-x11, firefox 140.17.0-1.el10_2 Red Hat Enterprise Linux 10 firefox 140.17.0-1.el10_2
    affected: workaround, no fix available “Fix deferred”
  • Red Hat Enterprise Linux 6 firefox, firefox 140.17.0-1.el10_2 Red Hat Enterprise Linux 7 firefox, firefox 140.17.0-1.el10_2 Red Hat Enterprise Linux 8 firefox, firefox 140.17.0-1.el10_2 Red Hat Enterprise Linux 10 firefox-flatpak
    not affected: vulnerable code not present

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
13 mo ago

Exploit prediction

0.35% chance of exploitation in the next 30 days, higher than 29% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CISA ADP 3.1 8.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N
CNA 3.1 8.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N

Affected products

  • Mozilla Firefox
  • Mozilla Thunderbird

Classification

Weakness
  • CWE-79 Improper Neutralization of Input During Web Page Generation

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.