CVE-2026-118492
Eclipse Langium langium-sprotty Cross-Site Scripting Vulnerability
Description
In Eclipse Langium versions 3.0.0 and later, the langium-sprotty package does not HTML-escape diagnostic messages before rendering them in the default hover popup provided by `addHoverPopupHandler`. If a Langium grammar allows cross-reference text to contain HTML markup (such as through a STRING terminal), an unresolved cross-reference produces a diagnostic message that includes the literal ref text. When a Sprotty diagram is opened for a malicious source file under these conditions, and a user hovers over the corresponding error marker, attacker-controlled JavaScript can execute in the browser or webview.
INFO
Published Date :
Nov. 9, 2026, 3:57 p.m.
Last Modified :
Nov. 9, 2026, 3:57 p.m.
Remotely Exploit :
No
Source :
eclipse
Affected Products
The following products are affected by CVE-2026-118492
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
No affected product recoded yet
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 4.0 | LOW | e51fbebd-6053-4e49-959f-1b94eeb69a2c |
Solution
- Update langium-sprotty to a version that fixes this issue.
- Sanitize diagnostic messages before rendering.
- Avoid allowing HTML in cross-reference text.
- Review security of terminal definitions.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-118492 vulnerability anywhere in the article.