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Fencer Intel
medium 6.1

CVE-2021-31674 json

Cyclos 4 PRO 4.14.7 and before does not validate user input at error inform, which allows remote unauthenticated attacker to execute javasc…

published 4y ago modified 4mo ago also EUVD-2021-18560

cvss
6.1
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
3.9%
EPSS 3.9% chance of exploitation in 30 days, percentile 90%
public exploits
1
Exploit-DB

Summary

Cyclos 4 PRO 4.14.7 and before does not validate user input at error inform, which allows remote unauthenticated attacker to execute javascript code via undefine enum constant.

Is CVE-2021-31674 in your stack? 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-50908)

Exploit prediction

3.95% chance of exploitation in the next 30 days, higher than 90% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

  • EDB-50908 Cyclos 4.14.7 - DOM Based Cross-Site Scripting (XSS) webapps, 2022-05-11
  • tf1t.gitbook.io https://tf1t.gitbook.io/mycve/cylos/cyclos-4.14.7-dom-based-cross-site-scripting-in-undefined-enum-cve-2021-31674 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 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.