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GHSA-hw62-58pr-7wc5

DOM Expressions has a Cross-Site Scripting (XSS) vulnerability due to improper use of string.replace

Source: GitHub Advisory Database (reviewed) High CVE-2025-27108

Packages

EcosystemPackageAffectedFixed in
npm dom-expressions < 0.39.5 0.39.5

Details

As written in the advisory (Markdown source, shown as plain text).

> [!NOTE] > This advisory was originally emailed to [email protected] by @nsysean. To sum it up, the use of javascript's `.replace()` opens up to potential XSS vulnerabilities with the special replacement patterns beginning with `$`. Particularly, when the attributes of `Meta` tag from solid-meta are user-defined, attackers can utilise the special replacement patterns, either `$'` or `$\`` to achieve XSS. The solid-meta package has this issue since it uses `useAffect` and context providers, which injects the used assets in the html header. "dom-expressions" uses `.replace()` to insert the assets, which is vulnerable to the special replacement patterns listed above. This effectively means that if the attributes of an asset tag contained user-controlled data, it would be vulnerable to XSS. For instance, there might be meta tags for the open graph protocol in a user profile page, but if attackers set the user query to some payload abusing `.replace()`, then they could execute arbitrary javascript in the victim's web browser. Moreover, it could be stored and cause more problems.

References

External links from the advisory. They lead to third-party sites.