Security Bulletin
Summary
IBM i is vulnerable to multiple vulnerabillities [CVE-2026-16694, CVE-2026-17101, CVE-2026-17099, CVE-2026-16904, CVE-2026-17095, CVE-2026-17094, CVE-2026-17268, CVE-2026-17266, CVE-2026-17276, CVE-2026-18099, CVE-2026-18098, CVE-2026-18235, CVE-2026-18713, CVE-2026-18683, CVE-2026-18250, CVE-2026-18106, CVE-2026-18144, CVE-2026-18148, CVE-2026-18150, CVE-2026-18246, CVE-2026-18847, CVE-2026-66010] in Navigator for i as described in the vulnerability details section.
Vulnerability Details
CVEID: CVE-2026-17266
DESCRIPTION: IBM i could allow a remote authenticated attacker to obtain sensitive information due to improper limitation of a pathname to a restricted directory.
CWE: CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
CVSS Source: IBM
CVSS Base score: 6.5
CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N)
CVEID: CVE-2026-18235
DESCRIPTION: IBM i could allow a remote authenticated attacker to execute arbitrary Control Language commands due to insufficient input validation.
CWE: CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
CVSS Source: IBM
CVSS Base score: 8.3
CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:L)
CVEID: CVE-2026-17268
DESCRIPTION: IBM i could allow a remote authenticated attacker to bypass security restrictions due to improper validation of a session token.
CWE: CWE-294: Authentication Bypass by Capture-replay
CVSS Source: IBM
CVSS Base score: 6.8
CVSS Vector: (CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N)
CVEID: CVE-2026-17276
DESCRIPTION: IBM i could allow a remote authenticated attacker to escalate privileges due to improper authorization in the handling of high-authority threads.
CWE: CWE-269: Improper Privilege Management
CVSS Source: IBM
CVSS Base score: 9.6
CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N)
CVEID: CVE-2026-18250
DESCRIPTION: IBM i could allow a remote authenticated attacker to obtain sensitive information and bypass security restrictions due to a race condition.
CWE: CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
CVSS Source: IBM
CVSS Base score: 6.3
CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L)
CVEID: CVE-2026-18713
DESCRIPTION: IBM i is vulnerable to privilege escalation via Navigator for i. An authenticated user could elevate privileges to a root user to execute commands.
CWE: CWE-269: Improper Privilege Management
CVSS Source: IBM
CVSS Base score: 8.8
CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H)
CVEID: CVE-2026-16904
DESCRIPTION: IBM i could allow a remote authenticated attacker to execute arbitrary commands due to improper privilege management during monitor owner reassignment.
CWE: CWE-269: Improper Privilege Management
CVSS Source: IBM
CVSS Base score: 8.1
CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N)
CVEID: CVE-2026-18148
DESCRIPTION: IBM i could allow a remote authenticated attacker to inject arbitrary content into Navigator log files due to improper output neutralization for logs.
CWE: CWE-117: Improper Output Neutralization for Logs
CVSS Source: IBM
CVSS Base score: 4.3
CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N)
CVEID: CVE-2026-18847
DESCRIPTION: IBM i could allow a remote unauthenticated attacker to harvest credentials due to spoofing of Navigator for i.
CWE: CWE-346: Origin Validation Error
CVSS Source: IBM
CVSS Base score: 8.8
CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H)
CVEID: CVE-2026-16694
DESCRIPTION: IBM i is vulnerable to stored cross-site scripting. This vulnerability allows an authenticated user to embed arbitrary JavaScript code in the Web UI thus altering the intended functionality potentially leading to credentials disclosure within a trusted session.
CWE: CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVSS Source: IBM
CVSS Base score: 6.4
CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N)
CVEID: CVE-2026-17094
DESCRIPTION: IBM i could allow a remote authenticated attacker to obtain sensitive information and manipulate files due to a path traversal vulnerability.
CWE: CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
CVSS Source: IBM
CVSS Base score: 4.3
CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N)
CVEID: CVE-2026-17095
DESCRIPTION: IBM i could allow a remote authenticated attacker to bypass security restrictions due to unsafe reflection.
CWE: CWE-915: Improperly Controlled Modification of Dynamically-Determined Object Attributes
CVSS Source: IBM
CVSS Base score: 8.3
CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:L)
CVEID: CVE-2026-18246
DESCRIPTION: IBM i could allow a remote authenticated attacker to bypass security restrictions due to an interpretation conflict in the multipart parser.
CWE: CWE-436: Interpretation Conflict
CVSS Source: IBM
CVSS Base score: 3
CVSS Vector: (CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:N/I:L/A:N)
CVEID: CVE-2026-18106
DESCRIPTION: IBM i could allow a remote authenticated attacker to obtain sensitive information due to improper validation of user-supplied path input.
CWE: CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
CVSS Source: IBM
CVSS Base score: 4.3
CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N)
CVEID: CVE-2026-66010
DESCRIPTION: DOMPurify before 3.4.12 fails to execute afterSanitizeElements hook for custom elements allowed via CUSTOM_ELEMENT_HANDLING.tagNameCheck, allowing attributes to bypass application security policies. Attackers can preserve sensitive attributes on custom elements that later re-inject them into innerHTML sinks, creating second-order XSS gadgets.
CWE: CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVSS Source: disclosure@vulncheck.com
CVSS Base score: 6.1
CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N)
CVEID: CVE-2026-18144
DESCRIPTION: IBM i could allow a remote authenticated attacker to bypass security restrictions due to improper authorization.
CWE: CWE-285: Improper Authorization
CVSS Source: IBM
CVSS Base score: 4.3
CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N)
CVEID: CVE-2026-18099
DESCRIPTION: IBM i could allow a remote authenticated attacker to execute arbitrary script code due to improper neutralization of user-controlled input.
CWE: CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVSS Source: IBM
CVSS Base score: 8.9
CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:L)
CVEID: CVE-2026-18150
DESCRIPTION: IBM i could allow a remote authenticated attacker to obtain sensitive information due to a race condition.
CWE: CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
CVSS Source: IBM
CVSS Base score: 4.3
CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N)
CVEID: CVE-2026-18098
DESCRIPTION: IBM i could allow a remote authenticated attacker to obtain sensitive information and compromise system integrity due to an XML injection flaw.
CWE: CWE-346: Origin Validation Error
CVSS Source: IBM
CVSS Base score: 8.1
CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N)
CVEID: CVE-2026-18683
DESCRIPTION: IBM i is vulnerable to privilege escalation via Navigator for i. An authenticated user could elevate privileges to a root user to execute commands.
CWE: CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
CVSS Source: IBM
CVSS Base score: 8.8
CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H)
CVEID: CVE-2026-17099
DESCRIPTION: IBM i could allow a remote attacker to obtain sensitive information due to improper authentication.
CWE: CWE-287: Improper Authentication
CVSS Source: IBM
CVSS Base score: 7.3
CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L)
CVEID: CVE-2026-17101
DESCRIPTION: IBM i could allow a remote attacker to execute arbitrary code or obtain sensitive information due to improper authentication.
CWE: CWE-287: Improper Authentication
CVSS Source: IBM
CVSS Base score: 8.3
CVSS Vector: (CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H)
Affected Products and Versions
| Affected Product(s) | Version(s) |
| IBM i | 7.6 |
| IBM i | 7.5 |
| IBM i | 7.4 |
| IBM i | 7.3 |
Remediation/Fixes
IBM strongly recommends addressing the vulnerability now.
| IBM i Release | 5770-SS1 Option 3 PTF Number(s) | PTF Download Link(s) |
| 7.6 | SJ10887 | https://www.ibm.com/mysupport/s/fix-information?legacy=SJ10887 |
| 7.5 | SJ10888 | https://www.ibm.com/mysupport/s/fix-information?legacy=SJ10888 |
| 7.4 | SJ10890 | https://www.ibm.com/mysupport/s/fix-information?legacy=SJ10890 |
| 7.3 | SJ10891 | https://www.ibm.com/mysupport/s/fix-information?legacy=SJ10891 |
IBM recommends users running unsupported versions of affected products upgrade to a supported and fixed version of affected products.
Workarounds and Mitigations
None
Get Notified about Future Security Bulletins
References
Acknowledgement
Change History
11 Aug 2026: Initial Publication
*The CVSS Environment Score is customer environment specific and will ultimately impact the Overall CVSS Score. Customers can evaluate the impact of this vulnerability in their environments by accessing the links in the Reference section of this Security Bulletin.
Disclaimer
According to the Forum of Incident Response and Security Teams (FIRST), the Common Vulnerability Scoring System (CVSS) is an "industry open standard designed to convey vulnerability severity and help to determine urgency and priority of response." IBM PROVIDES THE CVSS SCORES ""AS IS"" WITHOUT WARRANTY OF ANY KIND, INCLUDING THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. CUSTOMERS ARE RESPONSIBLE FOR ASSESSING THE IMPACT OF ANY ACTUAL OR POTENTIAL SECURITY VULNERABILITY. In addition to other efforts to address potential vulnerabilities, IBM periodically updates the record of components contained in our product offerings. As part of that effort, if IBM identifies previously unidentified packages in a product/service inventory, we address relevant vulnerabilities regardless of CVE date. Inclusion of an older CVEID does not demonstrate that the referenced product has been used by IBM since that date, nor that IBM was aware of a vulnerability as of that date. We are making clients aware of relevant vulnerabilities as we become aware of them. "Affected Products and Versions" referenced in IBM Security Bulletins are intended to be only products and versions that are supported by IBM and have not passed their end-of-support or warranty date. Thus, failure to reference unsupported or extended-support products and versions in this Security Bulletin does not constitute a determination by IBM that they are unaffected by the vulnerability. Reference to one or more unsupported versions in this Security Bulletin shall not create an obligation for IBM to provide fixes for any unsupported or extended-support products or versions.
Document Location
Worldwide
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Document Information
Modified date:
11 August 2026
Initial Publish date:
11 August 2026
UID
ibm17283292