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Python EUVDEUVD-2026-49778

| CVE-2026-62427 HIGH
Improper Access Control (CWE-284)
2026-07-28 security@xen.org GHSA-92vf-cq3f-7mp6
Authentication Bypass Python Suse
8.8
CVSS 3.1 · Vendor: xen
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Vulnerability Assessment

Weakness
CWE
CWE-284
OWASP Top 10:2025
A01:2025 - Broken Access Control
ASVS 5.0
V8 - Authorization Access control enforcement
MITRE ATT&CK

1 technique across 1 tactic: Defense Evasion

The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up.

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This Week Schedule remediation this week. Why: HIGH severity (CVSS 7.0-8.9).
Patch available 0.2% exploitation probability (EPSS)

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AnalysisAIv1 – Jul 28, 2026

Privilege escalation in Xen hypervisor due to lock acquisition unfairness in platform operations allows authenticated control-domain users to bypass XSM/Flask permission checks. An attacker with low-privileged authenticated access can exploit the race condition to execute privileged operations, potentially gaining full control of the system. The vulnerability carries a CVSS 8.8 rating but has no known active exploitation or public exploit code.

Affects your stack

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  • Exploit and PoC references, threat intelligence from 22 sources
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Severity by source

Vendor (xen) PRIMARY 8.8 HIGH
AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
SUSE 5.9 MEDIUM
AV:L/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:H

Primary rating from Vendor (xen).

CVSS VectorVendor: xen

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

4
Severity Changed
Jul 28, 2026 - 16:22 NVD
MEDIUM HIGH
CVSS changed
Jul 28, 2026 - 16:22 NVD
5.5 (MEDIUM) 8.8 (HIGH)
CVE Published
Jul 28, 2026 - 13:19 cve.org
UNKNOWN (no severity yet)
CVE Published
Jul 28, 2026 - 13:19 cve.org
HIGH 8.8

DescriptionCVE.org

[This CNA information record relates to multiple CVEs; the text explains which aspects/vulnerabilities correspond to which CVE.]

To manage the system, sysctl and platform operations are used by the control domain or a possible Xenstore domain. Some of these operations may not be executed in parallel, so a system-wide lock each is used. The way those locks are acquired is, however, not providing any fairness. Furthermore, with XSM/Flask in use, the lock acquire will, for some operations, occur ahead of any permission checking.

The sysctl issue is CVE-2026-62426.

The platform-op issue is CVE-2026-62427.

Articles & Coverage 2

News 11 New Python Vulnerabilities - 0 Critical, 11 High Jul 29, 2026 News 11 New Python Vulnerabilities - 0 Critical, 11 High Jul 28, 2026

Threat Intelligence Overview

EPSS Score
0.2%
Top 84% exploitable
Data Quality
4 sources
Confidence: Medium
EUVD NVD CVE.org EPSS Vulnrichment Vendor VulDB

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue
Severity HIGH
CISA KEV No
Public POC No
EPSS 0.2%
Patch available Yes
Active threat No
Deciding rule
HIGH severity (CVSS 7.0-8.9)
What every action level means
Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.
Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.
This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.
This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.
Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived
Scheduled
Exploitation
None
System Exposure· derived
Open
Automatable
No
Human Impact· derived
Medium
Technical Impact
Total

Priority Score

44
Low Medium High Critical
KEV: 0
EPSS: 0
CVSS: +44
PoC: 0
Weaponized: 0
Threat intel: 0
Gov advisory: 0

Attack Technique

Authentication Bypass CRITICAL

Authentication bypass attacks exploit flaws in the verification mechanisms that control access to systems and applications.

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Same weakness CWE-284 – Improper Access Control

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Same technique Authentication Bypass

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Vendor StatusVendor

SUSE

Severity: Moderate
Product Status
SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS Fixed
SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS Fixed
SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS Fixed
SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS Fixed
SUSE Linux Enterprise Micro 5.3 Fixed

References

Advisories & patches
ADVISORY https://nvd.nist.gov/vuln/detail/CVE-2026-62427 ADVISORY https://seclists.org/oss-sec/2026/q3/303 ADVISORY https://vuldb.com/vuln/383865 ADVISORY https://www.suse.com/support/update/SUSE-SU-2026:3409/ ADVISORY https://www.suse.com/support/update/SUSE-SU-2026:3423/ ADVISORY https://www.suse.com/support/update/SUSE-SU-2026:3451/ ADVISORY https://www.suse.com/support/update/SUSE-SU-2026:3462/ REF https://xenbits.xenproject.org/xsa/advisory-499.html

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