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TI-2026-77639 Aliases CVE-2026-91647GHSA-5rhh-mrxc-whjm

Improper access control in Oracle Essbase enables takeover

Priority LOW 37CWE-284Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
High
Impact type
Security bypass
Confidentiality · integrity · availability
High · High · High
Fix status
No fix listed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-284.

Summary

The supported version 21.8.3.0.0 of Oracle Essbase is affected. Improper access control (CWE-284) lets an unauthenticated attacker with network access over TCP take over Oracle Essbase, although the attack is difficult to carry out.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

Description from the CNA

Vulnerability in Oracle Essbase (component: Security). The supported version that is affected is 21.8.3.0.0. Difficult to exploit vulnerability allows unauthenticated attacker with network access via TCP to compromise Oracle Essbase. Successful attacks of this vulnerability can result in takeover of Oracle Essbase. CVSS 3.1 Base Score 8.1 (Confidentiality, Integrity and Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H).

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00329 26th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
OracleOracle Essbase21.8.3.0.0—No fix listedCNA
  • Oracle Essbase VendorOracle Affected 21.8.3.0.0 Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:oracle:essbase:21.8.3.0.0:*:*:*:*:*:*:*21.8.3.0.0VulnerableOracle
  • cpe:2.3:a:oracle:essbase:21.8.3.0.0:*:*:*:*:*:*:* Versions 21.8.3.0.0 Vulnerable ·Oracle

Remediation

The sources list no fixed version for Oracle Essbase.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Advisory ·

    Oracle Essbase — oracle.com/security-alerts/cpuoct2026.html

    36 records Highest priority Priority MEDIUM 7 MEDIUM, 29 LOW

    Other records, highest priority first

    • TI-2026-77657 Missing authentication in Oracle Essbase allows remote takeoverPriority MEDIUM 49
    • TI-2026-77636 Improper access control in Oracle Essbase allows remote compromisePriority MEDIUM 45
    • TI-2026-77655 Improper access control in Oracle Essbase allows takeoverPriority MEDIUM 43
    Show all 36 records → Advisory →

Timeline

  1. 2026-10-21 Threatist record created from CVE-2026-91647
  2. 2026-10-21 Alias added: GHSA-5rhh-mrxc-whjm
  3. 2026-10-22 Priority changed: MEDIUM → LOW
  4. 2026-10-23 CISA SSVC decision points changed
  5. 2026-10-23 Weakness changed · CISA ADP
  6. 2026-10-23 CISA SSVC decision points changed

References

Advisory 1

  • TI-2021-02645 SM2 Decryption Buffer Overflow CVSS 3.1CRITICAL 9.8
  • TI-2021-05762 Use after free in https://github.com/curl/curl CVSS 3.1HIGH 8.1
  • TI-2020-06702 Uncontrolled recursion in https://github.com/curl/curl CVSS 3.1HIGH 7.5
  • TI-2021-02413 NULL pointer deref in signature_algorithms processing CVSS 3.1MEDIUM 5.9
  • TI-2021-05758 Exposure of resource to wrong sphere in https://github.com/curl/curl CVSS 3.1MEDIUM 5.3
  • TI-2021-05737 Information disclosure in https://github.com/curl/curl CVSS 3.1MEDIUM 5.3
See all 60 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences