CVE-2026-12249Network attack vector

Trust store poisoning via plaintext CA certificate fetch

Published Jun 22, 2026 · Updated Jun 22, 2026

Trust store poisoning in Canonical ADSys 0.13.0 through 0.16.2 allows man-in-the-middle attackers to intercept TLS traffic. The cert_enroll function in gp_cert_auto_enroll_ext.py fetches the AD CS root certificate over plaintext HTTP and installs the returned certificate in the system trust store. Exploitation requires network position between the Ubuntu host and its configured AD CS CA during auto-enrollment; the rogue root enables persistent decryption or alteration of TLS connections using the operating system trust store.

CVSS severity8.3
High
EPSS probability0.14%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Trust store poisoning in Canonical ADSys 0.13.0 through 0.16.2 allows man-in-the-middle attackers to intercept TLS traffic. The cert_enroll function in gp_cert_auto_enroll_ext.py fetches the AD CS root certificate over plaintext HTTP and installs the returned certificate in the system trust store. Exploitation requires network position between the Ubuntu host and its configured AD CS CA during auto-enrollment; the rogue root enables persistent decryption or alteration of TLS connections using the operating system trust store.

The record

CVE
CVE-2026-12249
Published
Jun 22, 2026
Updated
Jun 22, 2026
Vendor
Canonical
Product
Ubuntu 22.04 LTS
Classifications
CWE-348, T1553.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 22, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 22, 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?

Affected versions are unavailable in this record. Check the vendor advisory for version and patch details.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Canonical · Ubuntu 22.04 LTSAffected versions are unavailable in this record.
Canonical · Ubuntu 24.04 LTSAffected versions are unavailable in this record.
Canonical · ADSysversion=0.13.0 <0.16.3

Published CVSS scores

8.3CanonicalCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H

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-348Use of Less Trusted Source
T1553.004Subvert Trust Controls: Install Root Certificate

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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