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Fencer Vulns
medium 6.1

CVE-2020-23992 json

Cross Site Scripting (XSS) in Nagios XI 5.7.1 allows remote attackers to run arbitrary code via returnUrl parameter in a crafted GET reques…

published 2023-08-22 3 y ago modified 2026-06-17 4 mo ago also EUVD-2020-16728

cvss
6.1
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
2.5%
EPSS 2.5% chance of exploitation in 30 days, percentile 84%
public exploits
0
none known

Summary

Cross Site Scripting (XSS) in Nagios XI 5.7.1 allows remote attackers to run arbitrary code via returnUrl parameter in a crafted GET request.

CISA SSVC

Exploitation
Proof of concept is public
Automatable
no
Technical impact
partial
Assessed
2 y ago

Exploit prediction

2.45% chance of exploitation in the next 30 days, higher than 84% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/EmreOvunc/Nagios-XI-Reflected-XSS 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

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.