How severe is CVE-2019-9875?

CVE-2019-9875 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2019-9875 being actively exploited?

Yes. CVE-2019-9875 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2025-03-26, which means active exploitation has been confirmed. It should be prioritised for remediation.

What products are affected by CVE-2019-9875?

CVE-2019-9875 affects Sitecore Cms. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2019-9875?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Because this CVE is known to be actively exploited, treat remediation as urgent — CISA KEV typically sets a short remediation deadline.

Does CVE-2019-9875 have an EU (EUVD) identifier?

Yes. CVE-2019-9875 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2019-19231. It is also flagged as exploited in the EUVD (since 2025-03-26).

When was CVE-2019-9875 published?

CVE-2019-9875 was published on 2019-05-31 and last updated on 2026-06-17.

CVE-2019-9875

CVE-2019-9875 is a high-severity vulnerability in Sitecore Cms with a CVSS 3.x base score of 8.8. It is listed in CISA's Known Exploited Vulnerabilities (KEV) catalog, confirming it has been exploited in the wild (added 2025-03-26). The underlying weakness is classified as CWE-502.

Key facts

Severity: High (CVSS 3.x base score 8.8)
CVSS v2: 6.5
EPSS exploit prediction: 14% (96th percentile)
Actively exploited: Yes — listed in CISA KEV (added 2025-03-26)
EU (EUVD) id: EUVD-2019-19231
EU exploitation: Flagged exploited in the ENISA EU Vulnerability Database (since 2025-03-26)
Weakness: CWE-502
Affected product: Sitecore Cms
Published: 2019-05-31
Last modified: 2026-06-17

Description

Deserialization of Untrusted Data in the anti CSRF module in Sitecore through 9.1 allows an authenticated attacker to execute arbitrary code by sending a serialized .NET object in an HTTP POST parameter.

Frequently asked questions

What is CVE-2019-9875?: Deserialization of Untrusted Data in the anti CSRF module in Sitecore through 9.1 allows an authenticated attacker to execute arbitrary code by sending a serialized .NET object in an HTTP POST parameter.
How severe is CVE-2019-9875?: CVE-2019-9875 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2019-9875 being actively exploited?: Yes. CVE-2019-9875 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2025-03-26, which means active exploitation has been confirmed. It should be prioritised for remediation.
What products are affected by CVE-2019-9875?: CVE-2019-9875 affects Sitecore Cms. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2019-9875?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Because this CVE is known to be actively exploited, treat remediation as urgent — CISA KEV typically sets a short remediation deadline.
Does CVE-2019-9875 have an EU (EUVD) identifier?: Yes. CVE-2019-9875 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2019-19231. It is also flagged as exploited in the EUVD (since 2025-03-26).
When was CVE-2019-9875 published?: CVE-2019-9875 was published on 2019-05-31 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:sitecore:cms:*:*:*:*:*:*:*:*

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