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CVE-2026-9311

CRITICAL 9

Published 2026-06-01 · Last modified 2026-06-02

IBM WebSphere Application Server 9.0, and 8.5 is vulnerable to remote code execution caused by the bypass of security controls.

ELEVATED IMPACT

Severe if exploited (CVSS 9), but no known exploitation and low modeled probability. Patch on a normal cadence.

Exploitation likelihood

0.5%chance of exploitation in 30 days · 38th percentile

○ In CISA KEV ○ Public exploit / PoC

Impact if exploited

9CVSS 3.1 · CRITICAL

  • ConfidentialityHigh
  • IntegrityHigh
  • AvailabilityHigh

What an attacker needs

  • ✓Access: Reachable over the network — no local access needed
  • ✓Privileges: No account or privileges required
  • ✓User interaction: No user interaction needed
  • ⚠Complexity: Needs a race window or specific setup

✓ lowers the bar for an attacker · ⚠ raises it

Affected

Vendors Ibm

Products Websphere Application Server

Weakness (CWE)

  • CWE-94: Code injection

CVSS vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H

References

Patches & mitigations

Sources: NVD · CVE.org · EPSS