PatchSiren

PatchSiren cyber security CVE debrief

CVE-2019-9874 Sitecore CVE debrief

CVE-2019-9874 is a Sitecore CMS and Experience Platform (XP) deserialization vulnerability that CISA has included in the Known Exploited Vulnerabilities catalog. For defenders, the key takeaway is not the technical detail alone, but the operational urgency: CISA has assigned a remediation due date of 2025-04-16 and directs organizations to apply vendor mitigations or discontinue use of the product if mitigations are not available.

Vendor
Sitecore
Product
CMS and Experience Platform (XP)
CVSS
Unknown
CISA KEV
Listed
Original CVE published
2025-03-26
Original CVE updated
2025-03-26
Advisory published
2025-03-26
Advisory updated
2025-03-26

Who should care

Security teams, Sitecore administrators, vulnerability management owners, and application/platform teams responsible for Sitecore CMS or Experience Platform (XP), especially where instances are internet-facing or support business-critical content workflows.

Technical summary

The supplied record identifies the issue as a deserialization vulnerability in Sitecore CMS and Experience Platform (XP). CISA’s KEV entry indicates the vulnerability is known to be exploited and points defenders to vendor instructions for mitigation. No exploit mechanics or severity score are provided in the supplied corpus, so the safest interpretation is to treat this as an actively exploited application-layer weakness requiring immediate remediation planning.

Defensive priority

High — the vulnerability is listed in CISA’s KEV catalog, with a remediation due date of 2025-04-16.

Recommended defensive actions

  • Identify all deployments of Sitecore CMS and Experience Platform (XP) across production, staging, and externally reachable environments.
  • Apply mitigations per the vendor instructions referenced by CISA as soon as possible.
  • If mitigations are unavailable or cannot be validated, discontinue use of the product as CISA advises.
  • Track remediation against the CISA KEV due date of 2025-04-16 and escalate overdue assets.
  • Use the official CVE and NVD references to confirm asset inventory, ownership, and remediation status for CVE-2019-9874.

Evidence notes

The supplied CISA KEV source item names the issue as a Sitecore CMS and Experience Platform (XP) deserialization vulnerability, marks it as KEV-listed, and provides dateAdded 2025-03-26 with dueDate 2025-04-16. CISA’s notes reference vendor instructions and the NVD entry. The official CVE and NVD links are included in the supplied resource set for canonical reference; no additional technical detail or exploit guidance was used.

Sources and references

Verified primary and authoritative sources

  • CVE-2019-9874 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2019-9874

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2019-9874 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2019-9874

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

  • CISA Known Exploited Vulnerabilities catalog

    Publisher, destination, and source semantics verified

    URL: https://www.cisa.gov/known-exploited-vulnerabilities-catalog

    Cybersecurity and Infrastructure Security Agency - Official CISA catalog of vulnerabilities known to be exploited in the wild.

Supplemental references

  • Source item URL

    Unverified legacy reference

    URL: https://www.cisa.gov/sites/default/files/feeds/known_exploited_vulnerabilities.json

    cisa_kev

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.