Dash apps vulnerable to Cross-site Scripting
Versions of the package dash-core-components before 2.13.0; versions of the package dash-core-components before 2.0.0; versions of the package dash before 2.15.0; versions of the package dash-html-components before 2.0.0; versions of the package dash-html-components before 2.0.16 are vulnerable to Cross-site Scripting (XSS) when the href of the a tag is controlled by an adversary. An authenticated attacker who stores a view that exploits this vulnerability could steal the data that's visible to another user who opens that view - not just the data already included on the page, but they could also, in theory, make additional requests and access other data accessible to this user. In some cases, they could also steal the access tokens of that user, which would allow the attacker to act as that user, including viewing other apps and resources hosted on the same server.
Note:
This is only exploitable in Dash apps that include some mechanism to store user input to be reloaded by a different user.
Affected software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| npm package | dash-core-components | < 2.13.0 | 2.13.0 |
| npm package | dash-html-components | < 2.0.16 | 2.0.16 |
| Python (PyPI) | dash | < 2.15.0 | 2.15.0 |
| Python (PyPI) | dash-core-components | < 2.0.0 | 2.0.0 |
| Python (PyPI) | dash-html-components | < 2.0.0 | 2.0.0 |
References
- https://nvd.nist.gov/vuln/detail/CVE-2024-21485
- https://github.com/plotly/dash/issues/2729
- https://github.com/plotly/dash/pull/2732
- https://github.com/plotly/dash/commit/9920073c9a8619ae8f90fcec1924f2f3a4332a8c
- https://github.com/advisories/GHSA-547x-748v-vp6p
- https://github.com/plotly/dash
- https://github.com/plotly/dash/releases/tag/v2.15.0
- https://github.com/pypa/advisory-database/tree/main/vulns/dash-core-components/PYSEC-2026-219.yaml
- https://github.com/pypa/advisory-database/tree/main/vulns/dash-html-components/PYSEC-2026-220.yaml
- https://github.com/pypa/advisory-database/tree/main/vulns/dash/PYSEC-2024-35.yaml
- https://security.snyk.io/vuln/SNYK-JS-DASHCORECOMPONENTS-6183084
- https://security.snyk.io/vuln/SNYK-JS-DASHHTMLCOMPONENTS-6226337
- https://security.snyk.io/vuln/SNYK-PYTHON-DASH-6226335
- https://security.snyk.io/vuln/SNYK-PYTHON-DASHCORECOMPONENTS-6226334
- https://security.snyk.io/vuln/SNYK-PYTHON-DASHHTMLCOMPONENTS-6226336
- CVSS vector
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:L/A:N- Weakness (CWE)
CWE-79- Platform
- npm, Python (PyPI)
- Package
dash-core-components, dash-html-components, dash- Disclosed
- 02.02.2024
- Updated
- 11.10.2026 14:18
Sources and licenses
OSV / GitHub Advisory Database - PYSEC-2024-35 - PyPA Advisory Database; CC BY 4.0
OSV / GitHub Advisory Database - PYSEC-2026-219 - PyPA Advisory Database; CC BY 4.0
OSV / GitHub Advisory Database - PYSEC-2026-220 - PyPA Advisory Database; CC BY 4.0
OSV / GitHub Advisory Database - GHSA-547x-748v-vp6p - CC BY 4.0
Vulnerability history: dash-html-components
All published vulnerabilities of this package (npm package), newest first. Shows whether this is a one-off slip or a package that needs watching.
This is the only known vulnerability of this package.
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