CVE-2025-9180Public exploitNetwork attack vector

Cross-site image disclosure via missing write-only propagation

Published Aug 19, 2025 · Updated Apr 13, 2026

Same-origin policy bypass in Mozilla Firefox and Thunderbird allows remote attackers to read cross-site images through crafted web content. An OffscreenCanvas bitmaprenderer marks only the offscreen canvas as write-only after receiving a cross-origin ImageBitmap, while HTMLCanvasElement readback checks the unmarked canvas element. Exploitation requires crafted web content to run in a victim's browser; it exposes exact image pixels, including personalized images, while Thunderbird mail reading disables scripting.

CVSS severity8.1
High
EPSS probability0.25%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Same-origin policy bypass in Mozilla Firefox and Thunderbird allows remote attackers to read cross-site images through crafted web content. An OffscreenCanvas bitmaprenderer marks only the offscreen canvas as write-only after receiving a cross-origin ImageBitmap, while HTMLCanvasElement readback checks the unmarked canvas element. Exploitation requires crafted web content to run in a victim's browser; it exposes exact image pixels, including personalized images, while Thunderbird mail reading disables scripting.

The record

CVE
CVE-2025-9180
Published
Aug 19, 2025
Updated
Apr 13, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-346, T1189
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 19, 2025CVE publishedPublication date reported by the CVE source.
  2. Apr 13, 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

6.5Amazon LinuxCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
8.1CISA ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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 exploitPublished

Weakness, pattern, technique

CWE-346Origin Validation Error
T1189Drive-by Compromise

Public exploit references

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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