What is CVE-2026-9191?

CVE-2026-9191 is a critical-severity vulnerability in Progress Software Corporation Marklogic Server, classified under Origin Validation Error. CVSS score: 9.6/10. Published 2026-10-12.

How severe is CVE-2026-9191?

Critical severity. CVSS v3 base score is 9.6 out of 10.

Vulnerability in Progress Software Corporation Marklogic Server

CVE-2026-9191

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.

Published 2026-10-12.

CVSS v3 metric

CVSS v3 base score 9.6 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Progress Software Corporation Marklogic Server

Weakness classification (CWE)

CWE-346 — Origin Validation Error

References

community.progress.com/s/article/Marklogic-Critical-Security-Alert-Bulletin-Oct… (vendor-advisory)

Frequently asked questions

What is CVE-2026-9191?: CVE-2026-9191 is a critical-severity vulnerability in Progress Software Corporation Marklogic Server, classified under Origin Validation Error. CVSS score: 9.6/10. Published 2026-10-12.
How severe is CVE-2026-9191?: Critical severity. CVSS v3 base score is 9.6 out of 10.