How severe is CVE-2026-2311?

CVE-2026-2311 has a CVSS 3.x base score of 6.4, rated medium severity. It is exploitable over network with high attack complexity, requires high privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-2311 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (10th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-2311?

CVE-2026-2311 primarily affects Ibm I. In total, 5 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2026-2311?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-2311 have an EU (EUVD) identifier?

Yes. CVE-2026-2311 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-26440.

When was CVE-2026-2311 published?

CVE-2026-2311 was published on 2026-04-30 and last updated on 2026-06-17.

CVE-2026-2311

CVE-2026-2311 is a medium-severity vulnerability in Ibm I with a CVSS 3.x base score of 6.4. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-284.

Key facts

Severity: Medium (CVSS 3.x base score 6.4)
EPSS exploit prediction: 0% (10th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-26440
Weakness: CWE-284
Affected product: Ibm I
Published: 2026-04-30
Last modified: 2026-06-17

Description

IBM i 7.6, 7.5, 7.4, 7.3, and 7.2 s vulnerable to privilege escalation caused by an invalid IBM i Web Administration GUI authorization check. A malicious actor could cause user-controlled code to run with administrator privilege.

Frequently asked questions

What is CVE-2026-2311?: IBM i 7.6, 7.5, 7.4, 7.3, and 7.2 s vulnerable to privilege escalation caused by an invalid IBM i Web Administration GUI authorization check. A malicious actor could cause user-controlled code to run with administrator privilege.
How severe is CVE-2026-2311?: CVE-2026-2311 has a CVSS 3.x base score of 6.4, rated medium severity. It is exploitable over network with high attack complexity, requires high privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-2311 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (10th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-2311?: CVE-2026-2311 primarily affects Ibm I. In total, 5 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2026-2311?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-2311 have an EU (EUVD) identifier?: Yes. CVE-2026-2311 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-26440.
When was CVE-2026-2311 published?: CVE-2026-2311 was published on 2026-04-30 and last updated on 2026-06-17.

References

https://www.ibm.com/support/pages/node/7269560

Affected products (5)

cpe:2.3:o:ibm:i:7.2:*:*:*:*:*:*:*
cpe:2.3:o:ibm:i:7.3:*:*:*:*:*:*:*
cpe:2.3:o:ibm:i:7.4:*:*:*:*:*:*:*
cpe:2.3:o:ibm:i:7.5:*:*:*:*:*:*:*
cpe:2.3:o:ibm:i:7.6:*:*:*:*:*:*:*

More vulnerabilities in Ibm I

CVE-2026-7870 — High (CVSS 8.8): IBM i 7.6, 7.5, 7.4, and 7.3 could allow a user to gain elevated privileges due to an unqualified library call. A…
CVE-2025-36367 — High (CVSS 8.8): IBM i 7.6, 7.5, 7.4, 7.3, and 7.2 is vulnerable to privilege escalation caused by an invalid IBM i SQL services…
CVE-2025-36004 — High (CVSS 8.8): IBM i 7.2, 7.3, 7.4, and 7.5 could allow a user to gain elevated privileges due to an unqualified library call in IBM…
CVE-2022-22495 — High (CVSS 8.8): IBM i 7.3, 7.4, and 7.5 is vulnerable to SQL injection. A remote attacker could send specially crafted SQL statements,…
CVE-2023-30990 — High (CVSS 8.6): IBM i 7.2, 7.3, 7.4, and 7.5 could allow a remote attacker to execute CL commands as QUSER, caused by an exploitation…
CVE-2025-33108 — High (CVSS 8.5): IBM Backup, Recovery and Media Services for i 7.4 and 7.5 could allow a user with the capability to compile or restore…

All CVEs affecting Ibm I →

Other CWE-284 (Improper Access Control) vulnerabilities

CVE-2026-50746 — Critical (CVSS 10.0): A malicious actor with access to the network could exploit an Improper Access Control vulnerability found in UniFi…
CVE-2026-46978 — Critical (CVSS 10.0): Vulnerability in the Oracle Solaris product of Oracle Systems (component: Remote Administration Daemon). The…
CVE-2026-35308 — Critical (CVSS 10.0): Vulnerability in the Oracle Coherence product of Oracle Fusion Middleware (component: Centralized Third Party Jars).…
CVE-2026-35307 — Critical (CVSS 10.0): Vulnerability in the Oracle Coherence product of Oracle Fusion Middleware (component: Core). Supported versions that…
CVE-2026-46695 — Critical (CVSS 10.0): Boxlite is a sandbox service that allows users to create lightweight virtual machines (Boxes) and launch OCI containers…
CVE-2026-46840 — Critical (CVSS 10.0): Vulnerability in Oracle REST Data Services (component: Backend-as-a-Service). Supported versions that are affected are…

Browse all CWE-284 (Improper Access Control) vulnerabilities →