CVE-2026-8400: ibm websphere_application_server Unsafe Reflection
CVSS: 9.8v3.1CriticalAnalyzed
Published 05-08-2026Last modified 06-08-2026
Vulnerability summary
CVE-2026-8400 is a critical (CVSS 9.8) Unsafe Reflection vulnerability in ibm websphere_application_server. EPSS estimates a 0.48% chance of exploitation in the next 30 days, higher than 40.1% of scored vulnerabilities.
CVSS score
9.8/10
010
Critical · v3.1 (NVD)EPSS score
0.48%
0%100%
Low · +0.21 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Advisory lineage
Upstream 0 · Downstream 5 · Related 4Timeline
- 05-08-2026PublishedVulnerability first disclosed.
- 06-08-2026Last modifiedVulnerability information updated.
Description
IBM WebSphere Application Server 8.5, and 9.0 and IBM WebSphere Application Server - Liberty Continuous delivery has a flaw in the ORB component in IBM SDK, Java Technology Edition, may allow a malicious IIOP server to induce loading and instantation of arbitrary classes.
CVSS metrics
2 scores · 2 sources · 1 versionCritical 9.8Preferred score · NVD (NIST)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HSources2 sources · 8.1–9.8
- CVE.orgCNA8.1HighCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:HDiffers
EPSS trend
Probability
0.48%
Chance of exploitation in the next 30 days
Percentile
40%
Versus all other CVEs
30-day change
+0.21 pp
From 0.27% on 18-09-2026
18-09-202618-10-2026
EPSS score0.48%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Ibm2 products
- websphere_application_server8.5 | 9.0 | na | 8.5.0.0 | 9.0.0.0
- websphere application server - libertyContinuous delivery
1 vendor · 2 products