CVE-2026-91638CWE-284broken-access-control

CVE-2026-91638

Critical · published October 21, 2026

CVSS v3.1
9.9
EPSS
0%
Percentile
31.8
In the wild
Unconfirmed
What it is

Vulnerability in Oracle Essbase (component: Security). The supported version that is affected is 21.8.3.0.0. Easily exploitable vulnerability allows low privileged attacker with network access via HTTP to compromise Oracle Essbase. While the vulnerability is in Oracle Essbase, attacks may significantly impact additional products (scope change). Successful attacks of this vulnerability can result in takeover of Oracle Essbase. CVSS 3.1 Base Score 9.9 (Confidentiality, Integrity and Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H).

The record
Technical detail
CVSS v3.1
9.9 · CRITICAL
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.00389 · 31.8th percentile
Weakness
CWE-284 · Improper Access Control
Published
2026-10-21T02:21Z
Affected products (1)
ProductVersionsFixed in
oracle/essbaseall versions—
References (1)
https://www.oracle.com/security-alerts/cpuoct2026.html · [email protected]
EPSS history
Timeline
  • 22 OCT 03:36Z
    EPSS moved — → 0%
    epss
  • 20 OCT 21:26Z
    Vulnerability in Oracle Essbase (component: Security)
    cvelistv5
  • 20 OCT 21:26Z
    Vulnerability in Oracle Essbase (component: Security)
    cvelistv5