CVE-2026-74970Network attack vector

Cross-origin data access via site-isolation failure

Published Aug 18, 2026 · Updated Aug 18, 2026

Graphics site-isolation failure in Firefox and Thunderbird allows remote attackers to read or alter cross-origin data through crafted content. Mozilla identifies the Graphics component but has not disclosed the faulty code path or the origin-validation operation that fails. User interaction is required; affected releases include Firefox before 154, Firefox ESR before 153.1, Thunderbird before 154, and the Thunderbird 153 branch before 153.1, with no service interruption.

CVSS severity5.4
Medium
EPSS probability0.14%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Graphics site-isolation failure in Firefox and Thunderbird allows remote attackers to read or alter cross-origin data through crafted content. Mozilla identifies the Graphics component but has not disclosed the faulty code path or the origin-validation operation that fails. User interaction is required; affected releases include Firefox before 154, Firefox ESR before 153.1, Thunderbird before 154, and the Thunderbird 153 branch before 153.1, with no service interruption.

The record

CVE
CVE-2026-74970
Published
Aug 18, 2026
Updated
Aug 18, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-346
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 18, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 18, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

5.4CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-346Origin Validation Error

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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