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| Vulnerability ID | VCID-tgrp-u3wm-s3cb |
| Aliases |
CVE-2021-34435
GHSA-v9w2-v7j9-rjpr |
| Summary | Exposure of Resource to Wrong Sphere In Eclipse Theia to, 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. |
| Status | Published |
| Exploitability | 0.5 |
| Weighted Severity | 8.0 |
| Risk | 4.0 |
| Affected and Fixed Packages | Package Details |
| System | Score | Found at |
|---|---|---|
| epss | 0.00123 | https://api.first.org/data/v1/epss?cve=CVE-2021-34435 |
| cvssv3.1 | 8.8 | https://bugs.eclipse.org/bugs/show_bug.cgi?id=568018 |
| generic_textual | HIGH | https://bugs.eclipse.org/bugs/show_bug.cgi?id=568018 |
| cvssv3.1 | 8.8 | https://github.com/eclipse-theia/theia |
| generic_textual | HIGH | https://github.com/eclipse-theia/theia |
| cvssv3.1 | 8.8 | https://github.com/eclipse-theia/theia/commit/0761dcf5fe3c14c27432683d42d2c526ad0cfbd5 |
| generic_textual | HIGH | https://github.com/eclipse-theia/theia/commit/0761dcf5fe3c14c27432683d42d2c526ad0cfbd5 |
| cvssv3.1 | 8.8 | https://github.com/eclipse-theia/theia/pull/8759 |
| generic_textual | HIGH | https://github.com/eclipse-theia/theia/pull/8759 |
| cvssv3.1 | 8.8 | https://nvd.nist.gov/vuln/detail/CVE-2021-34435 |
| generic_textual | HIGH | https://nvd.nist.gov/vuln/detail/CVE-2021-34435 |
| Attack Vector (AV) | Attack Complexity (AC) | Privileges Required (PR) | User Interaction (UI) | Scope (S) | Confidentiality Impact (C) | Integrity Impact (I) | Availability Impact (A) |
|---|---|---|---|---|---|---|---|
network adjacent_network local physical |
low high |
none low high |
none required |
unchanged changed |
high low none |
high low none |
high low none |
| Attack Vector (AV) | Attack Complexity (AC) | Privileges Required (PR) | User Interaction (UI) | Scope (S) | Confidentiality Impact (C) | Integrity Impact (I) | Availability Impact (A) |
|---|---|---|---|---|---|---|---|
network adjacent_network local physical |
low high |
none low high |
none required |
unchanged changed |
high low none |
high low none |
high low none |
| Attack Vector (AV) | Attack Complexity (AC) | Privileges Required (PR) | User Interaction (UI) | Scope (S) | Confidentiality Impact (C) | Integrity Impact (I) | Availability Impact (A) |
|---|---|---|---|---|---|---|---|
network adjacent_network local physical |
low high |
none low high |
none required |
unchanged changed |
high low none |
high low none |
high low none |
| Attack Vector (AV) | Attack Complexity (AC) | Privileges Required (PR) | User Interaction (UI) | Scope (S) | Confidentiality Impact (C) | Integrity Impact (I) | Availability Impact (A) |
|---|---|---|---|---|---|---|---|
network adjacent_network local physical |
low high |
none low high |
none required |
unchanged changed |
high low none |
high low none |
high low none |
| Attack Vector (AV) | Attack Complexity (AC) | Privileges Required (PR) | User Interaction (UI) | Scope (S) | Confidentiality Impact (C) | Integrity Impact (I) | Availability Impact (A) |
|---|---|---|---|---|---|---|---|
network adjacent_network local physical |
low high |
none low high |
none required |
unchanged changed |
high low none |
high low none |
high low none |
| Percentile | 0.30922 |
| EPSS Score | 0.00123 |
| Published At | June 4, 2026, 12:55 p.m. |
| Date | Actor | Action | Source | VulnerableCode Version |
|---|---|---|---|---|
| 2026-06-02T04:39:57.114568+00:00 | GitLab Importer | Import | https://gitlab.com/gitlab-org/advisories-community/-/blob/main/npm/@theia/mini-browser/CVE-2021-34435.yml | 38.6.0 |