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TI-2026-71560 Aliases CVE-2026-103418GHSA-7fw9-g4rg-xvqv

Universal XSS via the HTML language attribute in Translation Services

Priority MEDIUM 40CWE-79Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Required
Attack complexity
Low
Impact type
Cross-site scripting
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA. Impact type from CWE-79.

Summary

Firefox for iOS directly interpolated the page's HTML language attribute into translation JavaScript, which is a cross-site scripting flaw (CWE-79). An unauthenticated remote attacker can make attacker-controlled markup execute code in Firefox's privileged content world, bypassing the page's Content Security Policy, if a user interacts with a crafted page and uses Translation Services.

Written with Claude Haiku 5.5 from the sources below · 2026-10-27

Description from the CNA

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00301 23rd percentileScored 2026-11-07
Fix Fixed Firefox for iOS (Mozilla): 157.1

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
MozillaFirefox for iOS—157.1Patch availableCNA
  • Firefox for iOS VendorMozilla Affected — Fixed in 157.1 Patch available CNA

Remediation

Mozilla fixed this in Firefox for iOS 157.1. Update Firefox for iOS to version 157.1 or later.

Written with Claude Haiku 5.5 from the sources below · 2026-10-27

  • Fix · CNA Firefox for iOS (Mozilla) Fixed in 157.1

Timeline

  1. 2026-10-13 Threatist record created from CVE-2026-103418
  2. 2026-10-13 Alias added: GHSA-7fw9-g4rg-xvqv
  3. 2026-10-13 CVSS score added · CISA ADP
  4. 2026-10-13 Weakness changed · CISA ADP
  5. 2026-10-13 CISA SSVC decision points changed
  6. 2026-10-14 CISA SSVC decision points changed
  7. 2026-10-14 Priority changed: LOW → MEDIUM

References

Other 2

  • TI-2024-08981 Use after free in Mozilla Firefox KEVCVSS 3.1CRITICAL 9.8
  • TI-2022-09832 Use after free in Mozilla Firefox KEVCVSS 3.1CRITICAL 9.6
  • TI-2019-08769 Improper input validation in Mozilla Firefox ESR KEVCVSS 3.1CRITICAL 10.0
  • TI-2010-03577 Mozilla Firefox 3.5.x through 3.5.14 and 3.6.x through 3.6.11, Thunderbird 3.1.6 before… KEVCVSS 3.1CRITICAL 9.8
  • TI-2023-04799 Out-of-bounds write in Google Chrome KEVCVSS 3.1HIGH 8.8
  • TI-2023-04477 Out-of-bounds write in Google Chrome KEVCVSS 3.1HIGH 8.8
See all 4204 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences