CVE-2026-11549: IBM WebSphere Application Server and WebSphere Application Server Liberty are affected by a virtual
Source GCVE Database
Not known to be exploited · CVSS 6.5 Medium.
Data as of 2 Nov 2026, 22:58 UTC
Thin evidence
One scorer or none| CNA (ibm) | CVSS 3.1 | 6.5 |
|---|
- EPSS
- 0.3% chance of exploitation in 30 days – higher than 25% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:NExploitation evidence
Disclosed: evidence found.
CVE published 18 Sep 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 2 Nov 2026.
What to do
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| IBMWebSphere Application Server | Affected
| Fixed in– |
| IBMWebSphere Application Server - Liberty | Affected
| Fixed in– |
AI-suggested
Until an official fix is available, organizations should monitor IBM's security advisories for updates and consider implementing compensating controls if possible to restrict unauthorized access.
Description
IBM WebSphere Application Server and WebSphere Application Server Liberty contain a virtual host bypass vulnerability (CVE-2026-11549) that allows unauthorized access by circumventing virtual host restrictions. The vulnerability has a CVSS v3.1 base score of 6.5, indicating medium severity. No patch or remediation information is currently available, and no exploits are known to be active in the wild.