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CVE-2021-39184

Sandboxed renderers can obtain thumbnails of arbitrary files through the nativeImage API

HIGH
8.6
CVSS Score
Published: October 12, 2021 at 07:05 PM UTC
Updated: June 17, 2026 at 04:03 AM UTC
2 products affected across 2 vendorsElectronElectron

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Severity
HIGH8.6
Exploit prediction
EPSS 1%

Description

Electron is a framework for writing cross-platform desktop applications using JavaScript, HTML and CSS. A vulnerability in versions prior to 11.5.0, 12.1.0, and 13.3.0 allows a sandboxed renderer to request a "thumbnail" image of an arbitrary file on the user's system. The thumbnail can potentially include significant parts of the original file, including textual data in many cases. Versions 15.0.0-alpha.10, 14.0.0, 13.3.0, 12.1.0, and 11.5.0 all contain a fix for the vulnerability. Two workarounds aside from upgrading are available. One may make the vulnerability significantly more difficult for an attacker to exploit by enabling `contextIsolation` in one's app. One may also disable the functionality of the `createThumbnailFromPath` API if one does not need it.

Affected

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

Electron· Electronjsnpm
95%
10.1.0 ≤ v < 11.5.012.0.0 ≤ v < 12.1.013.0.0 ≤ v < 13.3.014.0.0 beta114.0.0 beta1014.0.0 beta1114.0.0 beta1214.0.0 beta1314.0.0 beta1414.0.0 beta1514.0.0 beta1614.0.0 beta1714.0.0 beta1814.0.0 beta1914.0.0 beta214.0.0 beta2014.0.0 beta2114.0.0 beta2214.0.0 beta2314.0.0 beta2414.0.0 beta2514.0.0 beta314.0.0 beta414.0.0 beta514.0.0 beta614.0.0 beta714.0.0 beta814.0.0 beta915.0.0 alpha115.0.0 alpha215.0.0 alpha315.0.0 alpha415.0.0 alpha515.0.0 alpha615.0.0 alpha715.0.0 alpha815.0.0 alpha9
Affected range stops below 11.5.0, so it looks safe — our inference, not a vendor statement
Affected range stops below 12.1.0, so it looks safe — our inference, not a vendor statement
Affected range stops below 13.3.0, so it looks safe — our inference, not a vendor statement
Electron· Electron
60%
v < 11.5.0v < 12.1.0v < 13.3.0
Affected range stops below 11.5.0, so it looks safe — our inference, not a vendor statement
Affected range stops below 12.1.0, so it looks safe — our inference, not a vendor statement
Affected range stops below 13.3.0, 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 (2)

x_refsource_MISCThird Party Advisory
Source: [email protected]
https://github.com/electron/electron/pull/30728
x_refsource_CONFIRMMitigationThird Party Advisory
Source: [email protected]
https://github.com/electron/electron/security/advisories/GHSA-mpjm-v997-c4h4

CVSS

8.6HIGH[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
CHANGED
Confidentiality
HIGH
Integrity
NONE
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-668CWE-862

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