CVE-2026-15634 json
IBM WebSphere Application Server and IBM WebSphere Application Server - Liberty Request Smuggling
published 2026-09-14 55 d ago modified 2026-10-22 17 d ago also EUVD-2026-78060
- cvss
- 6.5
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.4%
- EPSS 0.4% chance of exploitation in 30 days, percentile 30%
- public exploits
- 0
- none known
Summary
IBM WebSphere Application Server 8.5 and 9.0, and IBM WebSphere Application Server - Liberty 17.0.0.3 through 26.0.0.8 are vulnerable to HTTP request smuggling, caused by improper parsing of the HTTP transfer-encoding request header. By sending a specially crafted HTTP transfer-encoding request header, an attacker could exploit this vulnerability to poison the web cache, bypass web application firewall protection, and conduct XSS attacks.
Patch / fix
- ibm.com/support/pages/node/7286610 advisory
- ibm.com/support/pages/node/7286611 advisory
CISA SSVC
- Exploitation
- none
- Automatable
- yes
- Technical impact
- partial
- Assessed
- 54 d ago
Exploit prediction
0.37% chance of exploitation in the next 30 days, higher than 30% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 6.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N |
Affected products
- IBM WebSphere Application Server
- IBM WebSphere Application Server - Liberty
Classification
- Weakness
-
- CWE-444 Inconsistent Interpretation of HTTP Requests
References
-
ibm.com
/support/pages/node/7286610
vendor-advisory, patch
-
ibm.com
/support/pages/node/7286611
vendor-advisory, patch
Sources
- CVE List CVE-2026-15634
- NVD CVE-2026-15634
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