CVE-2026-13773

IBM WebSphere Extreme Scale 8.6.1.0 through 8.6.1.6 Approximately 50 generated CORBA stub classes in WebSphere eXtreme Scale's ogclient.jar call ORB.string_to_object() on an attacker-controlled IOR string during Java deserialization, turning any unfiltered ObjectInputStream sink in WAS into outbound IIOP SSRF to an attacker-chosen host; when chained with the IBM ORB's getUserException class-instantiation flaw (WAS-26), this SSRF escalates to remote code execution on the calling JVM.

CVSS v3 6.0 MEDIUM

6.0^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 1.8 / Impact : 3.7

Attack Vector NETWORK

Attack Complexity HIGH

Privileges Required LOW

User Interaction NONE

Confidentiality Impact LOW

Integrity Impact LOW

Availability Impact LOW

Scope CHANGED

References

Link	Resource
https://www.ibm.com/support/pages/node/7278594	Vendor Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:ibm:websphere_extreme_scale:*:*:*:*:*:*:*:*

History

02 Jul 2026, 18:26

Type	Values Removed	Values Added
References	~~() https://www.ibm.com/support/pages/node/7278594 -~~	() https://www.ibm.com/support/pages/node/7278594 - Vendor Advisory
CPE		cpe:2.3:a:ibm:websphere_extreme_scale::::::::
First Time		Ibm Ibm websphere Extreme Scale

30 Jun 2026, 20:17

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-06-30 20:17

Updated : 2026-07-02 18:26

NVD link : CVE-2026-13773

Mitre link : CVE-2026-13773

CVE.ORG link : CVE-2026-13773

JSON object : View

Products Affected

ibm

websphere_extreme_scale

CWE

CWE-918

Server-Side Request Forgery (SSRF)

{"id": "CVE-2026-13773", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-13773", "role": "CISA Coordinator", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "version": "2.0.3", "timestamp": "2026-06-30T19:37:43.519923Z"}}], "cvssMetricV31": [{"type": "Secondary", "source": "psirt@us.ibm.com", "cvssData": {"scope": "CHANGED", "version": "3.1", "baseScore": 6.0, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:L/A:L", "integrityImpact": "LOW", "userInteraction": "NONE", "attackComplexity": "HIGH", "availabilityImpact": "LOW", "privilegesRequired": "LOW", "confidentialityImpact": "LOW"}, "impactScore": 3.7, "exploitabilityScore": 1.8}, {"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "CHANGED", "version": "3.1", "baseScore": 10.0, "attackVector": "NETWORK", "baseSeverity": "CRITICAL", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}, "impactScore": 6.0, "exploitabilityScore": 3.9}]}, "affected": [{"source": "psirt@us.ibm.com", "affectedData": [{"cpes": ["cpe:2.3:a:ibm:websphere_extreme_scale:8.6.1.0:*:*:*:*:*:*:*", "cpe:2.3:a:ibm:websphere_extreme_scale:8.6.1.6:*:*:*:*:*:*:*"], "vendor": "IBM", "product": "WebSphere Extreme Scale", "versions": [{"status": "affected", "version": "8.6.1.0", "versionType": "semver", "lessThanOrEqual": "8.6.1.6"}]}]}], "published": "2026-06-30T20:17:29.227", "references": [{"url": "https://www.ibm.com/support/pages/node/7278594", "tags": ["Vendor Advisory"], "source": "psirt@us.ibm.com"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Primary", "source": "psirt@us.ibm.com", "description": [{"lang": "en", "value": "CWE-918"}]}], "descriptions": [{"lang": "en", "value": "IBM WebSphere Extreme Scale 8.6.1.0 through 8.6.1.6 Approximately 50 generated CORBA stub classes in WebSphere eXtreme Scale's ogclient.jar call ORB.string_to_object() on an attacker-controlled IOR string during Java deserialization, turning any unfiltered ObjectInputStream sink in WAS into outbound IIOP SSRF to an attacker-chosen host; when chained with the IBM ORB's getUserException class-instantiation flaw (WAS-26), this SSRF escalates to remote code execution on the calling JVM."}], "lastModified": "2026-07-02T18:26:29.023", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:ibm:websphere_extreme_scale:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "80E8BE43-5CF8-4B93-8443-BC6D57872BA6", "versionEndIncluding": "8.6.1.6", "versionStartIncluding": "8.6.1.0"}], "operator": "OR"}]}], "sourceIdentifier": "psirt@us.ibm.com"}