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📦
📦 npm
Not in CISA KEV
HIGH severity

CVE-2023-41049 — @dcl/single-sign-on-client

HIGHFix: decentraland/single-sign-on-client@bd20ea9

CVE-2023-41049 is a high-severity (CVSS 7.5) Cross-site Scripting (XSS) vulnerability in @dcl/single-sign-on-client. A fix is available for @dcl/single-sign-on-client — see the affected versions and patch details below.

Improper Neutralization of Script in Attributes in @dcl/single-sign-on-client

Also known asGHSA-vp4f-wxgw-7x8x
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
None indexed
Exploitation data as of Oct 21, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Exploitation Status

No confirmed exploitation observed yet

  • CISA assesses this as automatable — exploitation doesn’t require manual, per-target effort, which raises the odds of mass scanning and opportunistic attacks.
  • CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.

Exploitation and automatability from CISA’s SSVC triage for CVE-2023-41049.

EPSS Exploitation Probability

via FIRST.org ↗
0.5%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs39th percentile — riskier than 39% of all scored CVEsHighest risk
0.00%0.32%0.64%0.96%0.3%0.5%Apr 26Aug 26Oct 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

1 pkg affected

How broadly this vulnerability is actually deployed: weekly install volume shows current usage, and reverse-dependency count shows how many other packages break if it stays unpatched.

3other npm packages depend on this — each one inherits the vulnerability until it's patched upstream
@dcl/single-sign-on-clientnpm
834downloads / week

Description

@dcl/single-sign-on-client is an open source npm library which deals with single sign on authentication flows. Improper input validation in the init function allows arbitrary javascript to be executed using the javascript: prefix. This vulnerability has been patched on version 0.1.0. Users are advised to upgrade. Users unable to upgrade should limit untrusted user input to the init function.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
📦npm@dcl/single-sign-on-clientall versions0.1.0npm install @dcl/single-sign-on-client@0.1.0

Affected Products

1 product · 1 configurations
Application
single sign on clientdecentraland
< 0.1.0
range

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for @dcl/single-sign-on-client, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update @dcl/single-sign-on-client to 0.1.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2023-41049 is resolved across your whole dependency graph.

  3. Workarounds

    Escape or sanitise the affected output on the server side rather than relying on client-side filtering, and add a Content-Security-Policy that blocks inline script execution so injected markup cannot run even if it reaches the page.

Frequently Asked Questions

@dcl/single-sign-on-client is an open source npm library which deals with single sign on authentication flows. Improper input validation in the `init` function allows arbitrary javascript to be executed using the `javascript:` prefix. This vulnerability has been patched on version `0.1.0`. Users are advised to upgrade. Users unable to upgrade should limit untrusted user input to the `init` function.
O3 Security · Impact-Aware SCA

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CVE-2023-41049: @dcl/single-sign-on-client — Fixed in 0.1.0