CVE-2019-9875 (GCVE-0-2019-9875)

Vulnerability from cvelistv5 – Published: 2019-05-31 20:34 – Updated: 2025-10-21 23:45
VLAI CISA Previdian
Summary
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.
SSVC
Exploitation: active Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-03-26 20:22 UTC
CWE
  • n/a
  • CWE-502 - Deserialization of Untrusted Data
Assigner
mitre CNA under the mitre root
CNA scorecard E 29/100 over 2157 records in the last 180 days details
CISA
Known Exploited Vulnerability - GCVE BCP-07 Compliant

Vulnerability ID: CVE-2019-9875

Status: Confirmed

Status Updated: 2025-03-26 00:00 UTC

Exploited: Yes


Timestamps
First Seen: 2025-03-26
Asserted: 2025-03-26

Scope
Notes: Sitecore CMS and Experience Platform (XP) Deserialization Vulnerability | Affected: Sitecore / CMS and Experience Platform (XP) | Description: Sitecore CMS and Experience Platform (XP) contain a deserialization vulnerability in the Sitecore.Security.AntiCSRF module that allows an authenticated attacker to execute arbitrary code by sending a serialized .NET object in the HTTP POST parameter __CSRFTOKEN. | Required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. | Due date: 2025-04-16 | Known ransomware campaign use (KEV): Unknown | Notes (KEV): https://support.sitecore.com/kb?id=kb_article_view&sysparm_article=KB0038556 ; https://nvd.nist.gov/vuln/detail/CVE-2019-9875

Evidence

Type: Vendor Report

Signal: Successful Exploitation

Confidence: 80%

Source: cisa-kev


Details
Cwes CWE-502
Feed CISA Known Exploited Vulnerabilities Catalog
Product CMS and Experience Platform (XP)
Due Date 2025-04-16
Date Added 2025-03-26
Vendorproject Sitecore
Vulnerabilityname Sitecore CMS and Experience Platform (XP) Deserialization Vulnerability
Knownransomwarecampaignuse Unknown

References

Created: 2026-02-02 13:24 UTC | Updated: 2026-11-04 13:01 UTC
Previdian
Known Exploited Vulnerability - GCVE BCP-07 Compliant

Vulnerability ID: CVE-2019-9875

Status: Confirmed

Status Updated: 2025-03-26 00:00 UTC

Exploited: Yes


Timestamps
First Seen: 2025-03-26
Asserted: 2025-03-26

Scope
Notes: KEVIntel entry: Deserialization of Untrusted Data in the anti CSRF module in Sitecore through 9.1 allows an authenticated attacker to execute arbitrary code by... | Affected: Sitecore / Sitecore CMS | CVSS: 8.8 (HIGH) | Used in malware: unknown | Not yet in CISA KEV: False

Evidence

Type: Public Report

Signal: Successful Exploitation

Confidence: 70%

Source: kevintel


Details
Feed KEVIntel (kevintel.com)
Title Deserialization of Untrusted Data in the anti CSRF module in Sitecore through 9.1 allows an authenticated attacker to execute arbitrary code by...
Vendor Sitecore
Product Sitecore CMS
Added Date 2025-03-26T00:00:00.000Z
Cvss Score 8.8
Epss Score None
Cvss Severity HIGH
Epss Percentile None
Used In Malware unknown
Ahead Of Cisa Kev None
Not Yet In Cisa Kev False

References

Created: 2026-06-23 11:14 UTC | Updated: 2026-06-23 11:14 UTC
Show details on NVD website

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            "data_version": "4.0",
            "description": {
              "description_data": [
                {
                  "lang": "eng",
                  "value": "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."
                }
              ]
            },
            "problemtype": {
              "problemtype_data": [
                {
                  "description": [
                    {
                      "lang": "eng",
                      "value": "n/a"
                    }
                  ]
                }
              ]
            },
            "references": {
              "reference_data": [
                {
                  "name": "https://dev.sitecore.net/Downloads.aspx",
                  "refsource": "MISC",
                  "url": "https://dev.sitecore.net/Downloads.aspx"
                },
                {
                  "name": "https://www.synacktiv.com/blog.html",
                  "refsource": "MISC",
                  "url": "https://www.synacktiv.com/blog.html"
                },
                {
                  "name": "https://www.synacktiv.com/ressources/advisories/Sitecore_CSRF_deserialize_RCE.pdf",
                  "refsource": "MISC",
                  "url": "https://www.synacktiv.com/ressources/advisories/Sitecore_CSRF_deserialize_RCE.pdf"
                }
              ]
            }
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca",
        "assignerShortName": "mitre",
        "cveId": "CVE-2019-9875",
        "datePublished": "2019-05-31T20:34:46.000Z",
        "dateReserved": "2019-03-19T00:00:00.000Z",
        "dateUpdated": "2025-10-21T23:45:35.858Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}



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Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.

Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

JSON
How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

Events included in the timeline

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    Related by attack behaviour

    Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.