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Fencer Intel
medium 6.1

CVE-2020-28249 json

Cross-site scripting in Joplin

published 6y ago modified 4mo ago also GHSA-q26w-wjj2-22vv , EUVD-2021-1156

cvss
6.1
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
3.1%
EPSS 3.1% chance of exploitation in 30 days, percentile 87%
public exploits
1
Exploit-DB

Summary

Joplin 1.2.6 for Desktop allows XSS via a LINK element in a note.

Patch / fix

  • npm joplin 1.3.11

Is CVE-2020-28249 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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Timeline

  1. Published
  2. First public exploit (EDB-49024)

Exploit prediction

3.06% chance of exploitation in the next 30 days, higher than 87% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

  • EDB-49024 Joplin 1.2.6 - 'link' Cross Site Scripting webapps, 2020-11-09
  • github.com https://github.com/fhlip0/JopinXSS referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.1 6.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
NVD 2.0 4.3 AV:N/AC:M/Au:N/C:N/I:P/A:N
GitHub 3.1 6.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Affected packages

ecosystem package affected fixed in
npm joplin
<1.3.11
1.3.11

Classification

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

References

Sources

Fencer Intel 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.