What is CVE-2020-8951?

CVE-2020-8951 is a medium-severity vulnerability in Fiserv Accurate Reconciliation, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2020-02-26.

How severe is CVE-2020-8951?

Medium severity. CVSS v3 base score is 5.4 out of 10.

XSS in Fiserv Accurate Reconciliation

CVE-2020-8951

Fiserv Accurate Reconciliation 2.19.0, fixed in 3.0.0 or higher, allows XSS via the Source or Destination field of the Configuration Manager (Configuration Parameter Translation) page.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2020-02-26 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.006 (48.6th percentile), scored 2026-10-02.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 49th percentile — 48.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000

Affected products

Fiserv Accurate Reconciliation — versions 2.19.0

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

github.com/eSecure-CVEs/CVEs/blob/master/CVE-2020-8951 (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2020-8951?: CVE-2020-8951 is a medium-severity vulnerability in Fiserv Accurate Reconciliation, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2020-02-26.
How severe is CVE-2020-8951?: Medium severity. CVSS v3 base score is 5.4 out of 10.