How severe is CVE-2019-9874?

CVE-2019-9874 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2019-9874 being actively exploited?

Yes. CVE-2019-9874 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-2019-9874?

CVE-2019-9874 primarily affects Sitecore Cms. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2019-9874?

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-2019-9874 have an EU (EUVD) identifier?

Yes. CVE-2019-9874 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2019-19230. It is also flagged as exploited in the EUVD (since 2025-03-26).

When was CVE-2019-9874 published?

CVE-2019-9874 was published on 2019-05-31 and last updated on 2026-06-17.

CVE-2019-9874

CVE-2019-9874 is a critical-severity vulnerability in Sitecore Cms with a CVSS 3.x base score of 9.8. 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: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 84% (100th percentile)
Actively exploited: Yes — listed in CISA KEV (added 2025-03-26)
EU (EUVD) id: EUVD-2019-19230
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 Sitecore.Security.AntiCSRF (aka anti CSRF) module in Sitecore CMS 7.0 to 7.2 and Sitecore XP 7.5 to 8.2 allows an unauthenticated attacker to execute arbitrary code by sending a serialized .NET object in the HTTP POST parameter __CSRFTOKEN.

Frequently asked questions

What is CVE-2019-9874?: Deserialization of Untrusted Data in the Sitecore.Security.AntiCSRF (aka anti CSRF) module in Sitecore CMS 7.0 to 7.2 and Sitecore XP 7.5 to 8.2 allows an unauthenticated attacker to execute arbitrary code by sending a serialized .NET object in the HTTP POST parameter __CSRFTOKEN.
How severe is CVE-2019-9874?: CVE-2019-9874 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2019-9874 being actively exploited?: Yes. CVE-2019-9874 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-2019-9874?: CVE-2019-9874 primarily affects Sitecore Cms. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2019-9874?: 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-2019-9874 have an EU (EUVD) identifier?: Yes. CVE-2019-9874 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2019-19230. It is also flagged as exploited in the EUVD (since 2025-03-26).
When was CVE-2019-9874 published?: CVE-2019-9874 was published on 2019-05-31 and last updated on 2026-06-17.

References

Affected products (2)

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

More vulnerabilities in Sitecore Cms

CVE-2019-9875 — High (CVSS 8.8): Deserialization of Untrusted Data in the anti CSRF module in Sitecore through 9.1 allows an authenticated attacker to…
CVE-2019-11198 — Medium (CVSS 6.1): Multiple cross-site scripting (XSS) vulnerabilities in Sitecore CMS 9.0.1 and earlier allow remote attackers to inject…
CVE-2017-11439 — Medium (CVSS 5.4): In Sitecore 8.2, there is reflected XSS in the shell/Applications/Tools/Run Program parameter.
CVE-2017-11440 — Medium (CVSS 4.9): In Sitecore 8.2, there is absolute path traversal via the shell/Applications/Layouts/IDE.aspx fi parameter and the…
CVE-2014-100004 — Medium (CVSS 4.3): Cross-site scripting (XSS) vulnerability in Sitecore CMS before 7.0 Update-4 (rev. 140120) allows remote attackers to…
CVE-2009-2163 — Medium (CVSS 4.3): Cross-site scripting (XSS) vulnerability in login/default.aspx in Sitecore CMS before 6.0.2 Update-1 090507 allows…

All CVEs affecting Sitecore Cms →

Other CWE-502 (Deserialization of Untrusted Data) vulnerabilities

CVE-2026-41104 — Critical (CVSS 10.0): Deserialization of untrusted data in Microsoft Planetary Computer Pro allows an unauthorized attacker to disclose…
CVE-2026-43633 — Critical (CVSS 10.0): HestiaCP versions 1.9.0 through 1.9.4 contain a deserialization vulnerability in the web terminal component caused by a…
CVE-2026-33819 — Critical (CVSS 10.0): Deserialization of untrusted data in Microsoft Bing allows an unauthorized attacker to execute code over a network.
CVE-2026-20131 — Critical (CVSS 10.0): A vulnerability in the web-based management interface of Cisco Secure Firewall Management Center (FMC) Software could…
CVE-2026-25632 — Critical (CVSS 10.0): EPyT-Flow is a Python package designed for the easy generation of hydraulic and water quality scenario data of water…
CVE-2025-14931 — Critical (CVSS 10.0): Hugging Face smolagents Remote Python Executor Deserialization of Untrusted Data Remote Code Execution Vulnerability.…

Browse all CWE-502 (Deserialization of Untrusted Data) vulnerabilities →