CVE-2026-6327Network attack vector

Authenticated log falsification via unneutralized special elements

Published Sep 23, 2026 · Updated Sep 23, 2026

Log injection in IBM Concert 1.0.0 through 3.0.0 allows remote authenticated users to falsify log messages through crafted input. IBM has not identified the input field or logging call; affected code writes attacker-controlled special elements to log files without neutralizing them. Low-privileged network access is required, and forged entries can compromise log integrity without exposing data or interrupting service.

CVSS severity4.3
Medium
EPSS probability0.17%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Log injection in IBM Concert 1.0.0 through 3.0.0 allows remote authenticated users to falsify log messages through crafted input. IBM has not identified the input field or logging call; affected code writes attacker-controlled special elements to log files without neutralizing them. Low-privileged network access is required, and forged entries can compromise log integrity without exposing data or interrupting service.

The record

CVE
CVE-2026-6327
Published
Sep 23, 2026
Updated
Sep 23, 2026
Vendor
IBM
Product
Concert
Classifications
CWE-117
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 23, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 23, 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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1.0.0 <=3.0.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

IBM · Concertversion=1.0.0 <=3.0.0

Published CVSS scores

4.3IBMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/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.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-117Improper Output Neutralization for Logs

Public exploit references

No public exploit references are available in this record.

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Technologies

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