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Vulnerabilities

Vulnerability · CVE-2026-3303

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 l…

Published Oct 19, 2026 · catalog updated Nov 3, 2026 · the affected product

Last checked Nov 3, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2026-3303. EPSS is 0.22%. Act only if a listed version of the affected product is installed.

Gaps on this record

  • No plain product name is stored. The page cannot tell you which product to check.
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.

Same product and reporting

Severity
Low3.7
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.22%
Remediation
Version ranges on file
Affected products
cpe ibm/concert

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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe ibm/concert>= 1.0.0, <= 3.0.0

How to fix CVE-2026-3303

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-3303. EPSS is 0.22%. Act only if a listed version of the affected product is installed.

Which versions are affected?

Compare what you have installed with >= 1.0.0, <= 3.0.0. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-942: Permissive Cross-domain Policy with Untrusted Domains. EPSS 0.22%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Oct 19, 2026 · NIST NVD

    Detected

    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.

  2. Oct 20, 2026 · NIST NVD

    Updated

    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.

  3. Nov 3, 2026 · NIST NVD

    Updated

    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.

Sources

  • CVE.orgVulnerability recordCVE-2026-3303

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-3303

    30-day exploitation probability 0.22%

    first.org
  • NIST NVDVulnerability recordCVE-2026-3303

    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.

    nvd.nist.gov

References

Freshness

Last verified in this catalog Nov 3, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • NIST NVDNov 3, 2026
  • FIRST EPSSOct 31, 2026
  • CVE.orgOct 21, 2026