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Apache Traffic Server EUVDEUVD-2026-50167

| CVE-2026-41920 HIGH
Improper Access Control (CWE-284)
2026-07-29 apache GHSA-cjg7-6cv5-8fpp
Apache Authentication Bypass Apache Traffic Server
7.0
CVSS 4.0 · Vendor: apache
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Severity by source

Vendor (apache) PRIMARY
7.0 MEDIUM
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
vuln.today AI
8.7 HIGH

Network-reachable and unauthenticated (AV:N/PR:N), but the attack requirement raises complexity (AC:H); the bypass affects fronted backends, so scope changes (S:C) with high C/I and no availability impact.

3.1 AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N
4.0 AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N

Primary rating from Vendor (apache).

CVSS VectorVendor: apache

CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
X

Lifecycle Timeline

6
Analysis Updated
Jul 29, 2026 - 08:34 vuln.today
v2 (cvss_changed)
Re-analysis Queued
Jul 29, 2026 - 08:22 vuln.today
cvss_changed
Severity Changed
Jul 29, 2026 - 08:22 NVD
MEDIUM HIGH
CVSS changed
Jul 29, 2026 - 08:22 NVD
9.3 (MEDIUM) 7.0 (HIGH)
Analysis Generated
Jul 29, 2026 - 08:18 vuln.today
CVE Published
Jul 29, 2026 - 07:18 cve.org
MEDIUM 9.3

DescriptionCVE.org

Improper Access Control vulnerability in Apache Traffic Server.

This issue affects Apache Traffic Server: from 9.0.0 through 9.1.14, from 10.0.0 through 10.1.3.

Users are recommended to upgrade to version 9.1.15 or 10.1.4, which fixes the issue.

AnalysisAI

Access control bypass in Apache Traffic Server versions 9.0.0 through 9.1.14 and 10.0.0 through 10.1.3 lets remote unauthenticated attackers subvert authorization enforcement at the proxy, tagged by Apache as an authentication bypass (CWE-284). Because Traffic Server acts as a caching/reverse proxy, the flaw's impact lands on backend systems it fronts rather than on the proxy process itself. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Reach exposed ATS proxy over network
Delivery
Send crafted request triggering access-control flaw
Exploit
Bypass authorization enforcement
Execution
Reach protected backend resource
Impact
Expose or alter downstream data
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Vulnerability AssessmentAI

Exploitation Exploitation requires network access to a running Apache Traffic Server instance (9.0.0-9.1.14 or 10.0.0-10.1.3) and, per the CVSS 4.0 attack requirement (AT:P), a specific server-side condition outside the attacker's control that must hold for the access-control bypass to succeed; the supplied advisory reference does not enumerate that exact condition, so it must be confirmed from the Apache thread (https://lists.apache.org/thread/5prl9glcm9g2swnq9hqxvnokylm1gr6d). … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 base score of 7.0 (High) reflects a network-reachable (AV:N), low-complexity (AC:L), unauthenticated (PR:N), no-user-interaction (UI:N) issue, tempered by an attack requirement (AT:P) indicating some non-attacker-controlled condition must hold for exploitation. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker who can reach an exposed Apache Traffic Server instance sends crafted requests that exploit the improper access-control check, causing the proxy to grant access it should have denied and forward or expose requests to protected backend resources. Given AV:N/AC:L/PR:N, the request path requires no authentication or user interaction, though the AT:P attack requirement means a specific server-side condition must be present. …
Remediation Vendor-released patch: upgrade to Apache Traffic Server 9.1.15 (for the 9.x line) or 10.1.4 (for the 10.x line), as specified in the Apache advisory at https://lists.apache.org/thread/5prl9glcm9g2swnq9hqxvnokylm1gr6d. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours, identify all deployments of Apache Traffic Server versions 9.0.0-9.1.14 and 10.0.0-10.1.3 across your infrastructure and enable detailed request logging to establish baseline traffic patterns. …

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Threat intelligence, references, and detailed analysis are available after sign-in.

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EUVD-2026-50167 vulnerability details – vuln.today
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