CVE-2023-4052

MEDIUM

6.5

CVSS Score

Published: August 1, 2023 at 02:59 PM UTC

Updated: October 23, 2026 at 11:10 PM UTC

3 products affected across 1 vendorFirefoxFirefox ESRThunderbird

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Severity

MEDIUM6.5

Exploit prediction

EPSS 0.7%

SSVC

No known exploit

Description

The Firefox updater created a directory writable by non-privileged users. When uninstalling Firefox, any files in that directory would be recursively deleted with the permissions of the uninstalling user account. This could be combined with creation of a junction (a form of symbolic link) to allow arbitrary file deletion controlled by the non-privileged user. *This bug only affects Firefox on Windows. Other operating systems are unaffected.* This vulnerability affects Firefox < 116, Firefox ESR < 115.1, and Thunderbird < 115.1.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Firefox · Mozilla

95%

v < 116.0

Affected range stops below 116, so it looks safe — our inference, not a vendor statement

Affected range stops below 116.0, so it looks safe — our inference, not a vendor statement

Firefox ESR · Mozilla

95%

v < 115.1

Affected range stops below 115.1, so it looks safe — our inference, not a vendor statement

Thunderbird · Mozilla

90%

v < 115.1

Affected range stops below 115.1, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (4)

Issue TrackingPermissions Required

Source: [email protected]

https://bugzilla.mozilla.org/show_bug.cgi?id=1824420

Vendor Advisory

Source: [email protected]

https://www.mozilla.org/security/advisories/mfsa2023-29/

Vendor Advisory

Source: [email protected]

https://www.mozilla.org/security/advisories/mfsa2023-31/

Source: [email protected]

https://www.mozilla.org/security/advisories/mfsa2023-33/

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

6.5MEDIUM[email protected]

Attack Vector: NETWORK
Complexity: LOW
Privileges: LOW
User Interaction: NONE
Scope: UNCHANGED
Confidentiality: NONE
Integrity: HIGH
Availability: NONE

Vector?

Quick Info

StatusMODIFIED

CWE

CWE-59

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