What is the CVSS score of EUVD-2026-55252?

EUVD-2026-55252 has a CVSS 3.1 base score of 9.8 (Critical). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 0.2%.

Which versions of Apache Ranger are affected by EUVD-2026-55252?

Apache Ranger, which serves as the central authorization engine for Hadoop-ecosystem data access, contains a critical privilege escalation flaw affecting all versions 2.8.0 and earlier.

How to fix or mitigate EUVD-2026-55252?

Within 24 hours: Inventory all Apache Ranger instances and their versions; restrict network access to Ranger administrative interfaces to allow only trusted administrative networks. Within 7 days: Implement WAF or network-layer rules to detect and block URL parameters matching known exploitation patterns; enforce multi-factor authentication for all Ranger console access; review and audit recent administrative actions in Ranger logs for suspicious URL parameter manipulation. Within 30 days: Establish direct contact with Apache security team for patch status and timeline; evaluate air-gapping or read-only operational modes for non-critical Ranger deployments; prepare change management and rollback procedures for the emergency patch once released.

Apache Ranger EUVD-2026-55252

| CVE-2026-40920 CRITICAL

Improper Privilege Management (CWE-269)

2026-08-10 apache

GHSA-8q3p-j6v6-5x63

Privilege Escalation Apache Apache Ranger Apache Software Foundation

9.8

CVSS 3.1 · Vendor: apache

Severity by source

Vendor (apache) PRIMARY

9.8 HIGH

AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

vuln.today AI

8.8 HIGH

Network-reachable web parameter with low complexity, but 'privilege escalation' implies an existing low-privilege account (PR:L rather than the vendor's PR:N); full compromise of the policy engine yields High C/I/A.

3.1 AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

4.0 AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Primary rating from Vendor (apache).

CVSS VectorVendor: apache

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

Analysis Updated

Aug 12, 2026 - 16:31 vuln.today

v2 (cvss_changed)

Re-analysis Queued

Aug 12, 2026 - 16:22 vuln.today

cvss_changed

CVSS changed

Aug 12, 2026 - 16:22 NVD

9.8 (CRITICAL)

Analysis Generated

Aug 10, 2026 - 11:02 vuln.today

CVE Published

Aug 10, 2026 - 10:25 cve.org

HIGH

DescriptionCVE.org

Privilege Escalation via URL Parameter is reported in Apache Ranger versions <= 2.8.0.

Users are recommended to upgrade to version 2.9.0, which fixes this issue.

Articles & Coverage 1

News 8 New Apache Vulnerabilities - 8 High Severity, No Public Exploits Aug 11, 2026

AnalysisAI

Privilege escalation in Apache Ranger versions 2.8.0 and earlier allows an attacker to elevate their effective permissions by manipulating a URL parameter, undermining the very access-control layer Ranger is meant to enforce across Hadoop-ecosystem services. Apache rates it CVSS 9.8 with a network, low-complexity, no-privilege vector, though the 'privilege escalation' framing implies a pre-existing foothold that is worth verifying. There is no public exploit identified at time of analysis, and the EPSS score is low (0.19%, 9th percentile), indicating no observed mass-exploitation activity yet.

Technical ContextAI

Apache Ranger is a centralized authorization, auditing, and data-governance framework for the Hadoop ecosystem, brokering fine-grained access policies for services such as HDFS, Hive, HBase, Kafka, YARN, and Solr. The flaw is classified CWE-269 (Improper Privilege Management), meaning the application fails to correctly enforce the boundary between privilege levels - here through a URL parameter that influences the authorization decision. Because Ranger is itself the policy-decision point for an entire data platform, a weakness in its own privilege handling can cascade into unauthorized access across every downstream service it governs. The single affected CPE is cpe:2.3:a:apache_software_foundation:apache_ranger, confirming the scope is the Ranger product itself rather than a bundled dependency.

RemediationAI

Apply the primary fix by upgrading to Apache Ranger 2.9.0, which the vendor confirms resolves the issue; this is the recommended and only vendor-endorsed remediation. Consult the Apache advisory at https://lists.apache.org/thread/zh92fob9gqp196rvz3x9t0d2fnq9g27d before upgrading. Where an immediate upgrade is not feasible, compensating controls should focus on constraining reachability of the Ranger admin/policy interface: restrict network access to the Ranger Admin UI and REST endpoints to trusted management networks or a bastion (reducing the AV:N exposure, at the cost of breaking any legitimate broad access), place the interface behind an authenticating reverse proxy or WAF that can normalize and inspect URL parameters (which may cause false positives on legitimate policy-management traffic), and tighten and audit existing Ranger user roles so that any escalation starts from the lowest-possible baseline. Increase audit logging and monitor for anomalous privilege changes or policy edits until the patch is deployed. Because the exact vulnerable URL parameter is not disclosed in the available data, treat these controls as risk-reduction rather than a guaranteed block, and prioritize the 2.9.0 upgrade.