CVE-2025-65073Public exploitNetwork attack vector

Unauthenticated account access via reusable AWS signatures

Published Nov 17, 2025 · Updated Nov 17, 2025

Incorrect authorization in OpenStack Keystone before 26.0.1, 27.0.0, and 28.0.0 allows remote attackers to obtain Keystone authorization. The EC2 and S3 token APIs validate an AWS signature without establishing that it was intended for that Keystone request, so a presigned S3 URL signature is reusable. Unauthenticated endpoint reachability and a valid signature are required; EC2 can issue a fully scoped token, while S3 discloses accepted scope.

CVSS severity7.5
High
EPSS probability0.23%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Incorrect authorization in OpenStack Keystone before 26.0.1, 27.0.0, and 28.0.0 allows remote attackers to obtain Keystone authorization. The EC2 and S3 token APIs validate an AWS signature without establishing that it was intended for that Keystone request, so a presigned S3 URL signature is reusable. Unauthenticated endpoint reachability and a valid signature are required; EC2 can issue a fully scoped token, while S3 discloses accepted scope.

The record

CVE
CVE-2025-65073
Published
Nov 17, 2025
Updated
Nov 17, 2025
Vendor
OpenStack
Product
Keystone
Classifications
CWE-863, T1528, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 17, 2025CVE publishedPublication date reported by the CVE source.
  2. Nov 17, 2025Record 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=0 <26.0.1
  2. Affected versionversion=27.0.0
  3. Affected versionversion=28.0.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

OpenStack · Keystoneversion=0 <26.0.1; version=27.0.0; version=28.0.0

Published CVSS scores

7.5MITRECVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-863Incorrect Authorization
T1528Steal Application Access Token
T1190Exploit Public-Facing Application

Public exploit references

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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