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Fencer Intel
high 7.7

CVE-2020-5241 json

XSS/Script injection vulnerability in matestack

published 6y ago modified last mo. also GHSA-3jqw-vv45-mjhh , EUVD-2020-0287

cvss
7.7
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.6%
EPSS 0.6% chance of exploitation in 30 days, percentile 50%
public exploits
0
none known

Summary

matestack-ui-core (RubyGem) before 0.7.4 is vulnerable to XSS/Script injection. This vulnerability is patched in version 0.7.4.

Patch / fix

  • rubygems matestack-ui-core 0.7.4
  • matestack ui-core 0.7.4

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Exploit prediction

0.63% chance of exploitation in the next 30 days, higher than 50% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

  • github.com https://github.com/matestack/matestack-ui-core/security/advisories/GHSA-3jqw-vv45-mjhh referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 7.7 CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/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
NVD 2.0 3.5 AV:N/AC:M/Au:S/C:N/I:P/A:N
GitHub 3.1 7.7 CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:N

Affected packages

ecosystem package affected fixed in
rubygems matestack-ui-core
<0.7.4
0.7.4

Affected products

  • matestack matestack-ui-core

Classification

Weakness
  • CWE-80 Improper Neutralization of Script-Related HTML Tags in a Web Page
  • 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.