CVE-2019-9875
Sitecore CMS and Experience Platform (XP) Deserialization Vulnerability
- High 8.8
- Exploited: added to CISA KEV 26 Mar 2025
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.
Key facts
- Published
- 31 May 2019
- Last changed
- 21 Oct 2025
- Assigned by
- mitre
- KEV added
- 26 Mar 2025
- KEV fix due
- 16 Apr 2025
- EPSS
- 25.436% likely to be exploited in the next 30 days, higher than 97.978% of CVEs (scores for 15 Nov 2026)
- SSVC (CISA)
- Exploitation: active; Automatable: no; Technical impact: total
Severity scores
Each score is shown as its source gave it. They are not averaged or merged.
- 8.8CVSS 3.1, Highfrom CISA (ADP container)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
What to do
- Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.CISA KEV required action
Historical context and remediation
This reference retains the original CVE publication date. A recent record update does not mean a new attack occurred.
No separately sourced impact summary is available on this page yet. Consult the description, version data and dated exploitation evidence.
Version statuses below come from the CNA. An “unaffected” version is not necessarily a currently supported release or proof of a patch date. EPSS is a dated risk estimate, not a count of historical attacks.
Affected products
| Vendor | Product | Versions |
|---|---|---|
| n/a | n/a |
|
Timeline
- 31 May 2019 Published
- 26 Mar 2025 CVE-2019-9875 added to CISA KEV
- 26 Mar 2025 Added to the CISA KEV catalogue