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Exploited (KEV)1In CISA KEV
CVSS critical78CVSS 9.0–10.0
CVSS high203CVSS 7.0–8.9

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15 records in Theia · all components

TI-2026-12294 CVE-2026-14574 · GHSA-5f8h-2xph-wwxv

Prototype pollution in Eclipse Theia

Priority MEDIUM 59

In Eclipse Theia versions 0.7.0 and up until including 1.73.1, the `PreferenceUtils.merge` function in `@theia/core` recursively merges preference values without rejecting prototype-related keys (`__proto__`, `constructo…

CVSS 4.0MEDIUM 5.7 Local No auth User interaction EPSS 0.00395 Published 2026-08-05 Fixed in 1.74.0 CWE-1321
TI-2021-13470 CVE-2021-34436 · GHSA-8gpx-73gc-wq7c

Path traversal in Eclipse Theia

Priority MEDIUM 46

In Eclipse Theia 0.1.1 to 0.2.0, it is possible to exploit the default build to obtain remote code execution (and XXE) via the theia-xml-extension.

CVSS 3.1CRITICAL 9.8 Network No auth No interaction EPSS 0.02223 Published 2021-09-02 No fix listed CWE-22
TI-2020-16550 CVE-2020-27224 · GHSA-gcm9-cc3r-c6vj

Cross-site scripting in Eclipse Theia

Priority MEDIUM 46

In Eclipse Theia versions up to and including 1.2.0, the Markdown Preview (@theia/preview), can be exploited to execute arbitrary code.

CVSS 3.1CRITICAL 9.6 Network No auth User interaction EPSS 0.02593 Published 2021-02-24 Fixed in 1.3.0 CWE-79
TI-2026-10807 CVE-2026-12609 · GHSA-34gw-v4cc-pv7c

Path traversal in Eclipse Theia

Priority MEDIUM 42

In Eclipse Theia versions 1.66.0 and up until including 1.73.1, the `@theia/plugin-ext` backend exposes the `/hostedPlugin/:pluginId/:path(*)` HTTP endpoint, which resolves the requested file path with `path.resolve(loca…

CVSS 3.1HIGH 7.5 Network No auth No interaction EPSS 0.01644 Published 2026-08-05 Fixed in 1.74.0 CWE-22
TI-2026-44283 CVE-2026-61891 · GHSA-xrrm-6636-87r2

Information disclosure in Eclipse Theia

Priority MEDIUM 40

In Eclipse Theia versions up to and including 1.73.1, the `@theia/filesystem` backend exposes HTTP file-download endpoints (`GET /file`, `GET /files/`, `PUT /files/`) that convert a client-supplied URI directly to a file…

CVSS 3.1HIGH 7.5 Network No auth No interaction EPSS 0.00533 Published 2026-08-05 Fixed in 1.74.0 CWE-200
TI-2026-42788 CVE-2026-60009 · GHSA-2mw2-h8hj-xpjg

Path traversal in Eclipse Theia

Priority MEDIUM 40

In Eclipse Theia versions up to and including 1.73.1, the `@theia/filesystem` backend binds `POST /file-upload` in every filesystem-enabled deployment.

CVSS 3.1HIGH 8.8 Network No auth User interaction EPSS 0.00444 Published 2026-08-05 Fixed in 1.74.0 CWE-22
Priority LOW 39

In Eclipse Theia versions prior to 1.71.0, files matching the pattern .prompts/*.prompttemplate in a workspace were automatically loaded and could override or extend the AI agent's system prompts.

CVSS 4.0HIGH 8.4 Local No auth User interaction EPSS 0.00507 Published 2026-06-18 Fixed in 1.71.0 CWE-1427
TI-2021-13469 CVE-2021-34435 · GHSA-v9w2-v7j9-rjpr

Origin validation error in Eclipse Theia

Priority LOW 39

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.

CVSS 3.1HIGH 8.8 Network No auth User interaction EPSS 0.00595 Published 2021-09-01 Fixed in 1.9.0 CWE-942
Priority LOW 36

In Eclipse Theia versions 0.3.9 through 0.15.0, one of the default pre-packaged Theia extensions is "Mini-Browser", published as "@theia/mini-browser" on npmjs.com.

CVSS 3.1HIGH 8.1 Network No auth User interaction EPSS 0.00601 Published 2020-03-10 Fixed in 0.16.0 CWE-345
TI-2021-09390 CVE-2021-28161 · GHSA-cwg9-c9cr-p5fq

Cross-site scripting in Eclipse Theia

Priority LOW 28

In Eclipse Theia versions up to and including 1.8.0, in the debug console there is no HTML escaping, so arbitrary Javascript code can be injected.

CVSS 3.1MEDIUM 6.1 Network No auth User interaction EPSS 0.00708 Published 2021-03-12 Fixed in 1.8.1 CWE-79
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