Medium severity · published Mar 12, 2021
CVE-2021-28161
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
6.1
CVSS
0.7%
EPSS
No
On KEV
Description
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 vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.7% · higher than 53% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
TH
Theia · Eclipse
through 1.8.0 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-28161
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-28161
Exploit
https://github.com/eclipse-theia/theia/issues/8794
More from Theia
9.8
CVE-2021-34436
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
9.6
CVE-2020-27224
In Eclipse Theia versions up to and including 1.2.0, the Markdown Preview (@theia/preview), can be exploited to execute arbitrary code
8.8
CVE-2026-60009
In Eclipse Theia versions up to and including 1.73.1, the `@theia/filesystem` backend binds `POST /file-upload` in every filesystem-enabled deployment
8.8
CVE-2026-44691
In Eclipse Theia versions prior to 1.69.0, custom task definitions in workspace files (e.g
8.8
CVE-2026-46580
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…