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Fencer Vulns
medium 6.1

CVE-2020-15307 json

Nozomi Guardian before 19.0.4 allows attackers to achieve stored XSS (in the web front end) by leveraging the ability to create a custom fi…

published 2020-06-30 6 y ago modified 2026-06-17 4 mo ago also EUVD-2020-7304

cvss
6.1
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.7%
EPSS 0.7% chance of exploitation in 30 days, percentile 52%
public exploits
0
none known

Summary

Nozomi Guardian before 19.0.4 allows attackers to achieve stored XSS (in the web front end) by leveraging the ability to create a custom field with a crafted field name.

Patch / fix

  • nozominetworks guardian 19.0.4

Exploit prediction

0.69% chance of exploitation in the next 30 days, higher than 52% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • www2.deloitte.com https://www2.deloitte.com/de/de/pages/risk/articles/nozomi-stored-xss.html?nc=1 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

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.