CVE-2019-9875
Deserialization of Untrusted Data in the anti CSRF module in Sitecore through 9.1 allows an authenticated attacker to execute arbitrary…
- 8.8HighCVSS base score
- 25.4%Exploitation in 30 daysEPSS · top 2.0% of all CVEs
- YesKnown exploitedin CISA's KEV since 26 Mar 2025
- YesPublic exploitsa reference or SSVC says so
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.
Exploited in the wild
CISA lists this vulnerability in its Known Exploited Vulnerabilities catalog as Sitecore CMS and Experience Platform (XP) Deserialization Vulnerability.
- Added
- 26 Mar 2025
- Fix due (US federal)
- 16 Apr 2025
- Used by ransomware
- Not known
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
ENISA's EU Vulnerability Database lists it as exploited, from CISA's KEV, since 26 Mar 2025.
Public exploit
An exploit or proof of concept is public: anyone can try it against an unpatched system. CISA's SSVC rates its exploitation: it is being exploited.
Timeline
ID reserved
By mitre
- 2 months later
· 2 months later
Published
- 6 years later
· 6 years later
Added to CISA KEV
Known exploited in the wild
- 7 months later
· 7 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| CISA-ADPADP (enrichment) | 3.1 | High8.8 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| NVDNVD · Analyzed | 3.1 | High8.8 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 25.4% · top 2.0% of all CVEs (11 Nov 2026)
- CISA SSVC
- Exploitation: active · Automatable: no · Technical impact: total
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 8.8.
Affected products
n/a
- affected n/a
References
References4
- https://dev.sitecore.net/Downloads.aspx (opens in a new tab)x_refsource_MISCx_transferred
- https://www.synacktiv.com/blog.html (opens in a new tab)x_refsource_MISCx_transferred
- https://www.synacktiv.com/ressources/advisories/Sitecore_CSRF_deserialize_RCE.pdf (opens in a new tab)x_refsource_MISCx_transferred
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2019-9875 (opens in a new tab)government-resource
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- CISA KEV catalog (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2019-19231 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2019-9875)Record last updated .