CVE-2024-9397Network attack vector

Directory access via undelayed upload permission prompt

Published Oct 1, 2024 · Updated Mar 2, 2026

Clickjacking in Mozilla Firefox before 131, Firefox ESR before 128.3, and Thunderbird before 131 allows remote attackers to gain directory access. The directory-upload permission prompt accepts an immediate click because its user interface lacks the activation delay that prevents a newly exposed control from receiving a disguised click. A user must visit attacker-controlled web content and interact with the overlaid prompt; successful exploitation grants the site permission to upload files from the chosen directory.

CVSS severity6.1
Medium
EPSS probability0.37%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Clickjacking in Mozilla Firefox before 131, Firefox ESR before 128.3, and Thunderbird before 131 allows remote attackers to gain directory access. The directory-upload permission prompt accepts an immediate click because its user interface lacks the activation delay that prevents a newly exposed control from receiving a disguised click. A user must visit attacker-controlled web content and interact with the overlaid prompt; successful exploitation grants the site permission to upload files from the chosen directory.

The record

CVE
CVE-2024-9397
Published
Oct 1, 2024
Updated
Mar 2, 2026
Vendor
Mozilla
Product
Firefox
Classifications
CWE-1021, T1189
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 1, 2024CVE publishedPublication date reported by the CVE source.
  2. Mar 2, 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?

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

  1. Affected versionversion=unspecified <131

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Mozilla · Firefoxversion=unspecified <131
Mozilla · Thunderbirdversion=unspecified <128.3; version=unspecified <131
Mozilla · Firefox ESRversion=unspecified <128.3

Published CVSS scores

6.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
6.1CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/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.

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

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-1021Improper Restriction of Rendered UI Layers or Frames
T1189Drive-by Compromise

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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