Quick answers
- Is CVE-2026-15661 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-15661 being exploited in the wild.
- How severe is CVE-2026-15661?
- Medium severity, with a CVSS score of 5.3, published 19 October 2026.
- Which products and versions are affected?
- IBM Concert 1.0 through 3.0.0.
- Is there a fix for CVE-2026-15661?
- No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
- How is CVE-2026-15661 attacked?
- It is attacked over the network, in a hosted service.
- Am I affected by CVE-2026-15661?
- Check whether you run IBM Concert at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
The vulnerability is a log injection flaw caused by improper neutralization of special elements before writing to log files. It affects IBM Concert versions 1.0 through 3.0.0 and requires network access with no authentication. An attacker can inject arbitrary data into logs, potentially enabling log tampering, evasion of security monitoring, or malicious activity concealment.
Affected products
- IBM Concert 1.0 through 3.0.0
Timeline
- 2026-10-19: disclosed