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Fencer Vulns
medium 6.5

CVE-2024-21485 json

Dash apps vulnerable to Cross-site Scripting

published 2024-02-02 2 y ago modified 2026-07-20 3 mo ago also GHSA-547x-748v-vp6p , PYSEC-2024-35 , PYSEC-2026-219 , PYSEC-2026-220 , EUVD-2024-0032

cvss
6.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
1.5%
EPSS 1.5% chance of exploitation in 30 days, percentile 74%
public exploits
0
none known, plus a Nuclei check

Summary

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.

Patch / fix

  • npm dash-core-components 2.13.0
  • pypi dash-html-components 2.0.0
  • pypi dash-core-components 2.0.0
  • pypi dash 2.13.0, 2.15.0
  • npm dash-html-components 2.0.16
  • n/a dash-core-components 2.0.0, 2.13.0
  • n/a dash 2.15.0
  • n/a dash-html-components 2.0.0, 2.0.16

CISA SSVC

Exploitation
Proof of concept is public
Automatable
no
Technical impact
partial
Assessed
18 mo ago

Exploit prediction

1.49% chance of exploitation in the next 30 days, higher than 74% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • Nuclei template Dash Framework - Cross-site Scripting nuclei detection template
  • security.snyk.io https://security.snyk.io/vuln/SNYK-JS-DASHCORECOMPONENTS-6183084 referenced PoC, tagged "exploit" by a source, unverified
  • security.snyk.io https://security.snyk.io/vuln/SNYK-PYTHON-DASHCORECOMPONENTS-6226334 referenced PoC, tagged "exploit" by a source, unverified
  • security.snyk.io https://security.snyk.io/vuln/SNYK-PYTHON-DASH-6226335 referenced PoC, tagged "exploit" by a source, unverified
  • security.snyk.io https://security.snyk.io/vuln/SNYK-PYTHON-DASHHTMLCOMPONENTS-6226336 referenced PoC, tagged "exploit" by a source, unverified
  • security.snyk.io https://security.snyk.io/vuln/SNYK-JS-DASHHTMLCOMPONENTS-6226337 referenced PoC, tagged "exploit" by a source, unverified
  • github.com https://github.com/plotly/dash/issues/2729 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 6.5 CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:L/A:N/E:P
CNA 3.1 6.5 CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:L/A:N
NVD 3.1 5.4 CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
GitHub 3.1 6.5 CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:L/A:N
OSV 3.1 5.4 CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

Affected packages

ecosystem package affected fixed in
npm dash-core-components
<2.13.0
2.13.0
pypi dash-html-components
<2.0.0
2.0.0
pypi dash-core-components
<2.0.0
2.0.0
pypi dash
<2.15.0
<2.13.0
>=2.14.0, <2.15.0
2.15.0
2.13.0
npm dash-html-components
<2.0.16
2.0.16

Affected products

  • n/a dash-core-components
  • n/a dash
  • n/a dash-html-components

Classification

Weakness
  • CWE-79 Improper Neutralization of Input During Web Page Generation

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.