CVE-2026-3303 IBM Concert Software Permissive Cross-domain Security Policy
An attacker can perform privileged actions or access data due to overly permissive CORS settings in IBM Concert.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-3303?
CVE-2026-3303 is a low-severity vulnerability in IBM Concert, published on 19 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
IBM Concert 1.0 through 3.0.0 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.
Weakness: CWE-942
Which versions are affected by CVE-2026-3303?
How do I fix CVE-2026-3303?
No fix has been published for CVE-2026-3303 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-3303 being exploited?
There is no known exploitation of CVE-2026-3303 in the wild and no public exploit code.
Sources
Also known as GHSA-m52p-rqhq-p69f.