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CVE-2023-28163

MEDIUM
6.5
CVSS Score
Published: June 2, 2023 at 12:00 AM UTC
Updated: October 23, 2026 at 11:10 PM UTC
3 products affected across 1 vendorFirefoxThunderbirdFirefox ESR

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Severity
MEDIUM6.5
Exploit prediction
EPSS 0.8%
SSVC
PoC

Description

When downloading files through the Save As dialog on Windows with suggested filenames containing environment variable names, Windows would have resolved those in the context of the current user. <br>*This bug only affects Firefox on Windows. Other versions of Firefox are unaffected.*. This vulnerability affects Firefox < 111, Firefox ESR < 102.9, and Thunderbird < 102.9.

Affected

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

Firefox· Mozilla
95%
v < 111.0
Affected range stops below 111, so it looks safe — our inference, not a vendor statement
Affected range stops below 111.0, so it looks safe — our inference, not a vendor statement
Firefox ESR· Mozilla
95%
v < 102.9
Affected range stops below 102.9, so it looks safe — our inference, not a vendor statement
Thunderbird· Mozilla
95%
v < 102.9
Affected range stops below 102.9, so it looks safe — our inference, not a vendor statement

References (4)

Issue TrackingPermissions RequiredVendor Advisory
Source: [email protected]
https://bugzilla.mozilla.org/show_bug.cgi?id=1817768
Vendor Advisory
Source: [email protected]
https://www.mozilla.org/security/advisories/mfsa2023-09/
Vendor Advisory
Source: [email protected]
https://www.mozilla.org/security/advisories/mfsa2023-10/
Vendor Advisory
Source: [email protected]
https://www.mozilla.org/security/advisories/mfsa2023-11/

SSVC — Action Prioritization

SSVCPoCNot automatablePartial impact

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

CVSS

6.5MEDIUMCISA-ADP
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality
NONE
Integrity
HIGH
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
NVD-CWE-noinfoCWE-22

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