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

High severity GitHub Reviewed Published Feb 21, 2025 in ryansolid/dom-expressions • Updated Feb 25, 2025

Package

npm dom-expressions (npm)

Affected versions

< 0.39.5

Patched versions

0.39.5

Description

Note

This advisory was originally emailed to community@solidjs.com 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

@ryansolid ryansolid published to ryansolid/dom-expressions Feb 21, 2025
Published by the National Vulnerability Database Feb 21, 2025
Published to the GitHub Advisory Database Feb 25, 2025
Reviewed Feb 25, 2025
Last updated Feb 25, 2025

Severity

High

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
Low

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

EPSS score

Exploit Prediction Scoring System (EPSS)

This score estimates the probability of this vulnerability being exploited within the next 30 days. Data provided by FIRST.
(12th percentile)

Weaknesses

CVE ID

CVE-2025-27108

GHSA ID

GHSA-hw62-58pr-7wc5

Source code

Credits

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