What is CVE-2025-27909?

CVE-2025-27909 is a medium-severity vulnerability in Ibm Concert, classified under Permissive Cross-domain Policy with Untrusted Domains. CVSS score: 5.4/10. Published 2025-08-18.

How severe is CVE-2025-27909?

Medium severity. CVSS v3 base score is 5.4 out of 10.

Is CVE-2025-27909 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Vulnerability in Ibm Concert

CVE-2025-27909

IBM Concert Software 1.0.0 through 1.1.0 uses cross-origin resource sharing (CORS) which could allow an attacker to carry out privileged actions as the domain name is not being limited to only trusted domains.

EPSS: 0.002 (11.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N.

Affected products

Ibm Concert
Ibm Concert Software — versions 1.0.0

Weakness classification (CWE)

Public proof-of-concept exploits

fkie-cad/nvd-json-data-feeds

References

psirt@us.ibm.com (vendor-advisory, patch, Vendor Advisory)

Frequently asked questions

What is CVE-2025-27909?: CVE-2025-27909 is a medium-severity vulnerability in Ibm Concert, classified under Permissive Cross-domain Policy with Untrusted Domains. CVSS score: 5.4/10. Published 2025-08-18.
How severe is CVE-2025-27909?: Medium severity. CVSS v3 base score is 5.4 out of 10.
Is CVE-2025-27909 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.