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CVE-2026-103417

Saved credentials can be autofilled after cross-origin navigation

CVSS score

—

EPSS probability

—

Risk score

—

Published

3 h ago

OverviewPublic Exploits (0)NewsroomVulnerability Timeline
Patch status has not yet been verified

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Vulnerability description

CVE AI research

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DayBreach AI Explanation

Verified against sources

Security Bulletin for CVE-2026-103417

Sources read

1

Source agreement

Tam uyum

Evidence confidence

%55

Short explanation

Firefox for iOS contains a vulnerability that allows saved credentials to be autofilled after cross-origin navigation [S0]. This flaw occurs when cross-origin navigation happens while the saved-login UI is open [S0].

Why does it matter?

The failure to bind autofill to the originating page or reject it when the origin changes can lead to sensitive credentials being leaked to unintended pages [S0].

What should be done?

  • Follow vendor security advisories [S0].
  • Keep Firefox for iOS updated [S0].
Chain of evidence and sources2 verified claims

Firefox for iOS, kayıtlı oturum açma arayüzü açıkken çapraz kökenli gezinme gerçekleştiğinde kaydedilen kimlik bilgilerini otomatik doldurabilir [S0].

S0 · daybreach-canonicalS1 · cvelist

Otomatik doldurma özelliği orijinal sayfaya bağlı değildir ve kökeni değiştiğinde reddedilmez [S0].

S0 · daybreach-canonicalS1 · cvelist
Show the technical text from the sources

Firefox for iOS could autofill saved credentials into a new page if cross-origin navigation occurred while the saved-login UI was open. Autofill was not bound to the originating page or rejected when its origin changed. This vulnerability was fixed in Firefox for iOS 157.1.

Explanation produced with the local gemini-flash-lite-latest model. Numerical metrics and the KEV, patch and exploit statuses are not determined by AI.

IMPACT: Affected Products and Software

Affected Products

The following products are affected by CVE-2026-103417 vulnerability. Where our threat engine knows the exact affected versions, they are listed below.

IDVENDORPRODUCTACTION
1mozillaFirefox for iOS View
Total affected vendors: 1|Products: 1

RED HAT CSAF/VEX: Product Impact Check

Red Hat has not yet published a CSAF/VEX impact record for this CVE. This does not mean “not affected”.

SCORING: CVSS from Multiple Sources

CVSS Scores

The Common Vulnerability Scoring System is a standardised framework for assessing the severity of vulnerabilities in software and systems. We collect and display CVSS scores from several sources for each CVE.

SCOREVERSIONSEVERITYVECTORSOURCE
The sources have not yet published a verified CVSS metric.

Patch and Remediation Guide

Solution & Remediation Advisory

Patch status unknown

İncelenen resmî kaynaklarda yama durumu doğrulanamadı. Bu sonuç “yama yok” anlamına gelmez.

Confirm the affected product and version against the source evidence above.
Restrict access to internet-facing services and apply network segmentation.
Until a patch is confirmed, follow the vendor advisory; do not read an unknown status as “no patch”.
Monitor server logs and network endpoints for signs of anomalous execution.

Public exploit and active exploitation status

Verified exploit intelligence

No verified public PoC, exploit repository or Metasploit module has been found for this CVE yet.

Weakness Classification and Attack Patterns (CWE & CAPEC)

CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorises the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-103417 is associated with the following CWEs:

CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')CWE-20: Improper Input Validation

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-103417 weaknesses.

CAPEC-66: SQL InjectionCAPEC-126: Path TraversalCAPEC-28: OS Command Injection

Official Sources and Advisories

https://bugzilla.mozilla.org/show_bug.cgi?id=2068171vendor-advisoryhttps://www.mozilla.org/security/advisories/mfsa2026-105/vendor-advisory

Yama durumu bilinmiyor

İncelenen resmî kaynaklarda yama durumu doğrulanamadı. Bu sonuç “yama yok” anlamına gelmez.

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CVE-2026-103417 · Saved credentials can be autofilled after cross-origin navigation · DayBreach