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CVE-2026-92030

Mitigation bypass in the DOM: Copy & Paste and Drag & Drop component

MEDIUM
5.4
CVSS Score
Published: September 15, 2026 at 12:33 PM UTC
Updated: October 6, 2026 at 02:50 PM UTC
2 products affected across 1 vendorFirefoxThunderbird

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

Description

Mitigation bypass in the DOM: Copy & Paste and Drag & Drop component. This vulnerability was fixed in Firefox 156, Firefox ESR 140.16, and Firefox ESR 153.3.

Affected

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

Firefox· Mozilla
95%
v < 140.16.0141.0 ≤ v < 153.3.0154.0.0 ≤ v < 156.0.0
Vendor states this is fixed in 140.16 (unaffected)
Affected range stops below 140.16.0, so it looks safe — our inference, not a vendor statement
Vendor states this is fixed in 153.3 (unaffected)
Affected range stops below 153.3.0, so it looks safe — our inference, not a vendor statement
Vendor states this is fixed in 156 (unaffected)
Affected range stops below 156.0.0, so it looks safe — our inference, not a vendor statement
Thunderbird· Mozilla
95%
v < 140.16.0141.0 ≤ v < 153.3.0154.0 ≤ v < 156.0
Vendor states this is fixed in 140.16 (unaffected)
Affected range stops below 140.16.0, so it looks safe — our inference, not a vendor statement
Vendor states this is fixed in 153.3 (unaffected)
Affected range stops below 153.3.0, so it looks safe — our inference, not a vendor statement
Vendor states this is fixed in 156 (unaffected)
Affected range stops below 156.0, so it looks safe — our inference, not a vendor statement

References (7)

Permissions Required
Source: cverecord
https://bugzilla.mozilla.org/show_bug.cgi?id=2058417
Vendor Advisory
Source: cverecord
https://www.mozilla.org/security/advisories/mfsa2026-90/
Vendor Advisory
Source: cverecord
https://www.mozilla.org/security/advisories/mfsa2026-92/
Vendor Advisory
Source: cverecord
https://www.mozilla.org/security/advisories/mfsa2026-93/
Vendor Advisory
Source: cverecord
https://www.mozilla.org/security/advisories/mfsa2026-95/
Vendor Advisory
Source: [email protected]
https://www.mozilla.org/security/advisories/mfsa2026-94/
Vendor Advisory
Source: cverecord
https://www.mozilla.org/security/advisories/mfsa2026-96/

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

StatusANALYZED
CWE
CWE-693

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