Critical severity · published Aug 18, 2025
CVE-2025-27909
IBM Concert Software cross-origin resource sharing
9.8
CVSS
0.2%
EPSS
No
On KEV
Description
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 12% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
CS
Concert Software · IBM
1.0.0 through 1.1.0 · source: vendor
CO
Concert · Ibm
1.0.0 before 2.0.0 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-27909
CVE.org
https://www.cve.org/CVERecord?id=CVE-2025-27909
Vendor Advisory
https://www.ibm.com/support/pages/node/7242354
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