Critical severity · published Oct 12, 2026
CVE-2026-9191
Insufficient isolation of user-supplied code in Progress MarkLogic Server
9.6
CVSS
0.3%
EPSS
No
On KEV
Description
Progress MarkLogic Server 12.x releases before 12.1.0 and 11.x releases before 11.3.7 do not sufficiently isolate user-supplied code executed through certain REST and XDBC evaluation paths from HTTP request, response, and session state. An attacker able to execute code through an affected path could perform unauthorized actions or compromise an authenticated session.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
High
Integrity
High
Availability
High
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 20% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
MS
MarkLogic Server · Progress Software Corporation
11.0.0 before 11.3.7; 12.0.0 before 12.1.0 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-9191
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-9191
vendor-advisory
https://community.progress.com/s/article/Marklogic-Critical-Security-Alert-Bulletin-October-2026
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