What is CVE-2021-46660?

CVE-2021-46660 is a critical-severity vulnerability in Signiant Manager\+agents, classified under Improper Restriction of XML External Entity Reference (XXE). CVSS score: 9.8/10. Published 2022-01-30.

How severe is CVE-2021-46660?

Critical severity. CVSS v3 base score is 9.8 out of 10.

XXE in Signiant Manager\+agents

CVE-2021-46660

Signiant Manager+Agents before 15.1 allows XML External Entity (XXE) attacks.

Vulnerability class: XXE (XML External Entity)

Published 2022-01-30 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.012 (65.9th percentile), scored 2026-10-03.

Low probability of exploitation in the next 30 days, but still tracked. 66th percentile — 65.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.012 · newest: 0.012 · change: 0.000

Affected products

Signiant Manager\+agents

Weakness classification (CWE)

CWE-611 — Improper Restriction of XML External Entity Reference (XXE)

References

www.signiant.com/technology/security/ (Vendor Advisory)
help.signiant.com/flight-deck/general/release-notes-15-1 (Release Notes, Vendor Advisory)

Frequently asked questions

What is CVE-2021-46660?: CVE-2021-46660 is a critical-severity vulnerability in Signiant Manager\+agents, classified under Improper Restriction of XML External Entity Reference (XXE). CVSS score: 9.8/10. Published 2022-01-30.
How severe is CVE-2021-46660?: Critical severity. CVSS v3 base score is 9.8 out of 10.