CVE-2026-103418CWE-79cross-site-scripting

CVE-2026-103418

High · published October 13, 2026

CVSS v3.1
8.8
EPSS
0%
Percentile
21.6
In the wild
Unconfirmed
What it is

Firefox for iOS directly interpolated the page’s HTML language attribute into translation JavaScript, allowing attacker-controlled markup to execute code in Firefox’s privileged content world and bypass the page’s Content Security Policy. This vulnerability was fixed in Firefox for iOS 157.1.

The record
Technical detail
CVSS v3.1
8.8 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.00301 · 21.6th percentile
Weakness
CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Published
2026-10-13T12:16Z
References (2)
https://bugzilla.mozilla.org/show_bug.cgi?id=2062109 · [email protected]https://www.mozilla.org/security/advisories/mfsa2026-105/ · [email protected]
EPSS history
Timeline
  • 14 OCT 03:27Z
    EPSS moved — → 0%
    epss
  • 13 OCT 07:19Z
    Universal XSS via the HTML language attribute in Translation Services
    cvelistv5
  • 13 OCT 07:19Z
    Universal XSS via the HTML language attribute in Translation Services
    cvelistv5