CVE-2023-28161Public exploitNetwork attack vector

Device access via shared local-file permission key

Published Jun 2, 2023 · Updated Jan 9, 2025

Permission isolation failure in Site Permissions in Mozilla Firefox before 111 allows attackers to access granted devices through local files. SitePermissions keyed temporary allows by the shared file:// prePath, so every file URL loaded in one tab inherited the same grant. Exploitation requires a user to grant a one-time permission to one local document and then open an attacker-controlled local file in that tab, exposing only the granted capability.

CVSS severity8.8
High
EPSS probability0.62%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Permission isolation failure in Site Permissions in Mozilla Firefox before 111 allows attackers to access granted devices through local files. SitePermissions keyed temporary allows by the shared file:// prePath, so every file URL loaded in one tab inherited the same grant. Exploitation requires a user to grant a one-time permission to one local document and then open an attacker-controlled local file in that tab, exposing only the granted capability.

The record

CVE
CVE-2023-28161
Published
Jun 2, 2023
Updated
Jan 9, 2025
Vendor
Mozilla
Product
Firefox
Classifications
CWE-281, T1204.002
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 2, 2023CVE publishedPublication date reported by the CVE source.
  2. Jan 9, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=unspecified <111

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Mozilla · Firefoxversion=unspecified <111

Published CVSS scores

8.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

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-281Improper Preservation of Permissions
T1204.002User Execution: Malicious File

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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