November 14, 2026

CVE Watchtower

CVE-2026-41920Apache Software Foundation Apache Traffic Server Improper Access Control

NVD

Vulnerability Summary

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.
Severity Level
CRITICAL(9.3)
Published Date
Jul 29, 2026
Last Modified
Jul 29, 2026
Exploitation Status
No confirmed exploitation yet
EPSS Score (30-Day)
0.31%Probability
Root Weakness (CWE)
CWE-284: Improper Access Control ↗
The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor.
CVSS v4.0 Base Metrics — Score 7.0 (HIGH)
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
Attack VectorNetwork
Attack ComplexityLow
Attack RequirementsPresent
Privileges RequiredNone
User InteractionNone
Confidentiality (Vulnerable System)None
Integrity (Vulnerable System)None
Availability (Vulnerable System)None
Confidentiality (Subsequent System)High
Integrity (Subsequent System)High
Availability (Subsequent System)None
Show CVSS v3.x metrics (score 9.3)
CVSS v3.1 Base Metrics — Score 9.3 (CRITICAL)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:H/A:N
Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredNone
User InteractionNone
ScopeChanged
ConfidentialityLow
IntegrityHigh
AvailabilityNone

Affected & Patched Versions

Affected Versions
  • Apache Software Foundation Apache Traffic Server >= 9.0.0 and <= 9.1.14
  • Apache Software Foundation Apache Traffic Server >= 10.0.0 and <= 10.1.3
Patched Versions
  • Apache Software Foundation Apache Traffic Server 9.1.14
  • Apache Software Foundation Apache Traffic Server 10.1.3

What to do

Plan remediation soon. No exploitation is confirmed yet, but the severity is critical.

  1. Check whether you run Apache Software Foundation Apache Traffic Server and which version.
  2. Update to a patched version listed above, then confirm the new version.

Timeline

  • Jul 29, 2026Published
  • Jul 29, 2026Record last modified

Score, severity and exploitation changes are tracked from the day Watchtower started logging them.

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Related Coverage

More Apache Software Foundation Apache Traffic Server CVEs

External References

Data last checked: Nov 14, 2026 02:13 UTC