CVE-2025-3033Public exploit

Local file disclosure via shortcut dereferencing

Published Apr 1, 2025 · Updated Apr 13, 2026

Link following in Firefox and Thunderbird before 137 allows attackers to upload a local file after a user selects a malicious Windows .url shortcut. The Windows file-open dialog dereferences the shortcut because it is invoked without FOS_NODEREFERENCELINKS, substituting the linked file for the selected shortcut. The attack requires local shortcut selection and exposes only the substituted file; Mozilla reports no effect on other operating systems.

CVSS severity7.7
High
EPSS probability0.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Link following in Firefox and Thunderbird before 137 allows attackers to upload a local file after a user selects a malicious Windows .url shortcut. The Windows file-open dialog dereferences the shortcut because it is invoked without FOS_NODEREFERENCELINKS, substituting the linked file for the selected shortcut. The attack requires local shortcut selection and exposes only the substituted file; Mozilla reports no effect on other operating systems.

The record

CVE
CVE-2025-3033
Published
Apr 1, 2025
Updated
Apr 13, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-59, T1204.002
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 1, 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 vectorlocal
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

4.4Amazon LinuxCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
7.7CanonicalCVSS:3.1/AV:L/AC:L/PR:N/UI:N/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-59Improper Link Resolution Before File Access ('Link Following')
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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