CVE-2026-53561Network attack vector

Unauthenticated user impersonation via inverted signature check

Published Aug 25, 2026 · Updated Aug 26, 2026

Improper authentication in Apache Hive 4.0.0 through 4.2.0 allows remote attackers to impersonate any Hive user via a forged bearer token. HiveSamlAuthTokenGenerator.signatureMatches reverses MessageDigest.isEqual, accepting a mismatched signature while rejecting the matching signature. The flaw is reachable only when HiveServer2 uses HTTP transport with native SAML authentication, where access to /cliservice yields an authenticated session without Hive credentials or an IdP login.

CVSS severity7.4
High
EPSS probability0.27%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper authentication in Apache Hive 4.0.0 through 4.2.0 allows remote attackers to impersonate any Hive user via a forged bearer token. HiveSamlAuthTokenGenerator.signatureMatches reverses MessageDigest.isEqual, accepting a mismatched signature while rejecting the matching signature. The flaw is reachable only when HiveServer2 uses HTTP transport with native SAML authentication, where access to /cliservice yields an authenticated session without Hive credentials or an IdP login.

The record

CVE
CVE-2026-53561
Published
Aug 25, 2026
Updated
Aug 26, 2026
Vendor
The Apache Software Foundation
Product
Apache Hive
Classifications
CWE-345, CWE-305, CWE-287, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 26, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=4.0.0 <=4.2.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Apache Software Foundation · Apache Hiveversion=4.0.0 <=4.2.0

Published CVSS scores

7.4CISA-ADPCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-345Insufficient Verification of Data Authenticity
CWE-305Authentication Bypass by Primary Weakness
CWE-287Improper Authentication
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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