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CVE-2025-1018

Fullscreen notification is not displayed when fullscreen is re-requested

MEDIUM
5.3
CVSS Score
Published: February 4, 2025 at 01:58 PM UTC
Updated: October 5, 2026 at 03:10 PM UTC
2 products affected across 1 vendorFirefoxThunderbird

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Severity
MEDIUM5.3
Exploit prediction
EPSS 0.4%
SSVC
No known exploit

Description

The fullscreen notification is prematurely hidden when fullscreen is re-requested quickly by the user. This could have been leveraged to perform a potential spoofing attack. This vulnerability affects Firefox < 135 and Thunderbird < 135.

Affected

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

Firefox· Mozilla
95%
v < 135.0
Vendor states this is fixed in 135 (unaffected)
Affected range stops below 135.0, so it looks safe — our inference, not a vendor statement
Thunderbird· Mozilla
95%
131.0 ≤ v < 135.0
Vendor states this is fixed in 135 (unaffected)
Affected range stops below 135.0, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

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

Patch and advisory references

References (3)

Permissions Required
Source: [email protected]
https://bugzilla.mozilla.org/show_bug.cgi?id=1910818
Vendor Advisory
Source: [email protected]
https://www.mozilla.org/security/advisories/mfsa2025-07/
Vendor Advisory
Source: [email protected]
https://www.mozilla.org/security/advisories/mfsa2025-11/

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

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

CVSS

5.3MEDIUM[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
LOW
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-1021

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