🛡️ CVE-2021-34435 — mini-browser

🟠 CVSS 8.0 — High ✅ No Known Exploit CWE-346 OSV
8.0
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

Remote code execution in Eclipse Theia

In Eclipse Theia 0.3.9 to 1.8.1, the "mini-browser" extension allows a user to preview HTML files in an iframe inside the IDE. But with the way it is made it is possible for a previewed HTML file to trigger an RCE. This exploit only happens if a user previews a malicious file.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs no privileges on the target. A user must be tricked into taking some action. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality high, integrity high, availability high.

Weakness class

CVE-2021-34435 is classified as CWE-346: Origin Validation Error. The origin of a message or request is not verified properly, so one source can pose as another.

Affected software

CVE-2021-34435 is recorded against 1 package.

  • @theia/mini-browser

Timeline and source

Published on 2 September 2021 and last revised on 8 November 2023. No public exploit is currently recorded for this entry. Record sourced from OSV.

References

nvd.nist.gov (Advisory)
github.com (Web)
github.com (Web)
bugs.eclipse.org (Web)
github.com (Package)

Details

Severity HIGH
CVSS Score 8.0
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CWE CWE-346
Public Exploit ✅ No
Source OSV
Published 2021-09-02
Updated 2026-08-12
Modified 2023-11-08
Fix URL N/A

Affected Packages

Software From version Fixed in
@theia/mini-browser — —

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