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CVE-2025-27426

Firefox Mobile iOS Full Address Bar Spoof Using Server-Side Redirect to internal error page

MEDIUM
5.4
CVSS Score
Published: March 4, 2025 at 01:31 PM UTC
Updated: June 17, 2026 at 09:03 AM UTC
1 product affected across 1 vendorFirefox· also runs on 1 platform

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Severity
MEDIUM5.4
Exploit prediction
EPSS 0.2%
SSVC
No known exploit

Description

Malicious websites utilizing a server-side redirect to an internal error page could result in a spoofed website URL This vulnerability affects Firefox for iOS < 136.

Affected

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

Firefox· Mozilla
95%
v < 136.0
Vendor states this is fixed in 136 (unaffected)
Affected range stops below 136.0, so it looks safe — our inference, not a vendor statement
apple-iphone-os (environment)

Runs on — not affected

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

Remediation

No guide yet

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

Patch and advisory references

References (2)

Issue Tracking
Source: [email protected]
https://bugzilla.mozilla.org/show_bug.cgi?id=1933079
Vendor Advisory
Source: [email protected]
https://www.mozilla.org/security/advisories/mfsa2025-13/

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

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

CVSS

5.4MEDIUMCISA-ADP
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality
LOW
Integrity
LOW
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-601

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