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CVE-2025-11720

Spoofing risk in Android custom tabs

HIGH

8.1

CVSS Score

Published: October 14, 2025 at 12:27 PM UTC

Updated: October 8, 2026 at 12:10 PM UTC

1 product affected across 1 vendorFirefox· also runs on 1 platform

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Severity

HIGH8.1

Exploit prediction

EPSS 0.3%

SSVC

No known exploit

Description

The Firefox and Firefox Focus UI for the Android custom tab feature only showed the "site" that was loaded, not the full hostname. User supplied content hosted on a subdomain of a site could have been used to fool a user into thinking it was content from a different subdomain of that site. This vulnerability affects Firefox < 144.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Firefox · Mozilla

95%

v < 144.0*

Vendor states this is fixed in 144 (unaffected)

Affected range stops below 144.0, so it looks safe — our inference, not a vendor statement

google-android (environment)

Runs on — not affected

The affected product only carries this flaw when running on these platforms. The platforms themselves are not vulnerable.

Android · Google

95%

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

https://www.mozilla.org/security/advisories/mfsa2025-81/

References (3)

Issue TrackingPermissions Required

Source: cverecord

https://bugzilla.mozilla.org/show_bug.cgi?id=1979534

Issue TrackingPermissions Required

Source: cverecord

https://bugzilla.mozilla.org/show_bug.cgi?id=1984370

Vendor Advisory

Source: cverecord

https://www.mozilla.org/security/advisories/mfsa2025-81/

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

8.1HIGHCISA-ADP

Attack Vector: NETWORK
Complexity: LOW
Privileges: NONE
User Interaction: REQUIRED
Scope: UNCHANGED
Confidentiality: HIGH
Integrity: HIGH
Availability: NONE

Vector?

Quick Info

StatusMODIFIED

CWE

CWE-451

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