CVE-2026-11541

HIGH
Published Jun 30, 2026 Modified Jul 2, 2026 CWE-444

Description

IBM WebSphere Application Server 9.0, and 8.5 and IBM WebSphere Application Server - Liberty 17.0.0.3 through 26.0.0.6 are affected by an HTTP request smuggling vulnerability.

CVSS v3.1 Score

7.4
HIGH
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

EPSS — Exploit Prediction

0.0042
Probability of exploitation
0.34%
Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-444 CWE-444

Affected Products

Vendor Product
ibm websphere_application_server
ibm websphere_application_server
ibm websphere_application_server

References

Frequently Asked Questions

What is CVE-2026-11541? +
IBM WebSphere Application Server 9.0, and 8.5 and IBM WebSphere Application Server - Liberty 17.0.0.3 through 26.0.0.6 are affected by an HTTP request smuggling vulnerability. It has a CVSS v3.1 base score of 7.4 (HIGH).
How severe is CVE-2026-11541? +
CVE-2026-11541 has a CVSS v3.1 score of 7.4 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching. The EPSS score is 0.0042, placing it in the 0th percentile for exploitation probability.
What products are affected by CVE-2026-11541? +
CVE-2026-11541 affects products from ibm, specifically: websphere_application_server. Check the affected products table above for specific version ranges.
How do I check if I'm vulnerable to CVE-2026-11541? +
You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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