How severe is CVE-2026-35300?

CVE-2026-35300 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-35300 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (45th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-35300?

CVE-2026-35300 primarily affects Oracle Weblogic Server. In total, 4 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2026-35300?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

Does CVE-2026-35300 have an EU (EUVD) identifier?

Yes. CVE-2026-35300 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-37426.

When was CVE-2026-35300 published?

CVE-2026-35300 was published on 2026-06-17 and last updated on 2026-06-18.

CVE-2026-35300

CVE-2026-35300 is a critical-severity vulnerability in Oracle Weblogic Server with a CVSS 3.x base score of 9.8. 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-502.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
EPSS exploit prediction: 1% (45th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-37426
Weakness: CWE-502
Affected product: Oracle Weblogic Server
Published: 2026-06-17
Last modified: 2026-06-18

Description

Vulnerability in the WebLogic Server product of Oracle Fusion Middleware (component: Core). Supported versions that are affected are 12.2.1.4.0, 14.1.1.0.0, 14.1.2.0.0 and 15.1.1.0.0. Easily exploitable vulnerability allows unauthenticated attacker with network access via TCP to compromise WebLogic Server. Successful attacks of this vulnerability can result in takeover of WebLogic Server. CVSS 3.1 Base Score 9.8 (Confidentiality, Integrity and Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H).

Frequently asked questions

What is CVE-2026-35300?: Vulnerability in the WebLogic Server product of Oracle Fusion Middleware (component: Core). Supported versions that are affected are 12.2.1.4.0, 14.1.1.0.0, 14.1.2.0.0 and 15.1.1.0.0. Easily exploitable vulnerability allows unauthenticated attacker with network access via TCP to compromise WebLogic Server. Successful attacks of this vulnerability can result in takeover of WebLogic Server. CVSS 3.1 Base Score 9.8 (Confidentiality, Integrity and Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H).
How severe is CVE-2026-35300?: CVE-2026-35300 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-35300 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (45th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-35300?: CVE-2026-35300 primarily affects Oracle Weblogic Server. In total, 4 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2026-35300?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2026-35300 have an EU (EUVD) identifier?: Yes. CVE-2026-35300 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-37426.
When was CVE-2026-35300 published?: CVE-2026-35300 was published on 2026-06-17 and last updated on 2026-06-18.

References

https://www.oracle.com/security-alerts/cspujun2026.html

Affected products (4)

cpe:2.3:a:oracle:weblogic_server:12.2.1.4.0:*:*:*:*:*:*:*
cpe:2.3:a:oracle:weblogic_server:14.1.1.0.0:*:*:*:*:*:*:*
cpe:2.3:a:oracle:weblogic_server:14.1.2.0.0:*:*:*:*:*:*:*
cpe:2.3:a:oracle:weblogic_server:15.1.1.0.0:*:*:*:*:*:*:*

More vulnerabilities in Oracle Weblogic Server

CVE-2026-35301 — Critical (CVSS 10.0): Vulnerability in the WebLogic Server product of Oracle Fusion Middleware (component: Console). Supported versions that…
CVE-2026-35292 — Critical (CVSS 10.0): Vulnerability in the WebLogic Server product of Oracle Fusion Middleware (component: Console). Supported versions that…
CVE-2017-10137 — Critical (CVSS 10.0): Vulnerability in the Oracle WebLogic Server component of Oracle Fusion Middleware (subcomponent: JNDI). Supported…
CVE-2010-0073 — Critical (CVSS 10.0): Unspecified vulnerability in the WebLogic Server in Oracle WebLogic Server 7.0 SP7, 8.1 SP6, 9.0, 9.1, 9.2 MP3, 10.0…
CVE-2008-3257 — Critical (CVSS 10.0): Stack-based buffer overflow in the Apache Connector (mod_wl) in Oracle WebLogic Server (formerly BEA WebLogic Server)…
CVE-2026-60702 — Critical (CVSS 9.9): Vulnerability in the Oracle WebLogic Server product of Oracle Fusion Middleware (component: Core). Supported versions…

All CVEs affecting Oracle Weblogic Server →

Other CWE-502 (Deserialization of Untrusted Data) vulnerabilities

CVE-2026-69836 — Critical (CVSS 10.0): Deserialization of untrusted data in Microsoft Entra ID allows an unauthorized attacker to execute code over a network.
CVE-2026-17061 — Critical (CVSS 10.0): A Deserialization of Untrusted Data vulnerability affecting SIMULIA Execution Engine from Release 2023 through Release…
CVE-2026-11756 — Critical (CVSS 10.0): A Deserialization of Untrusted Data vulnerability affecting Station Launcher App in 3DEXPERIENCE platform from Release…
CVE-2026-41104 — Critical (CVSS 10.0): Deserialization of untrusted data in Microsoft Planetary Computer Pro allows an unauthorized attacker to disclose…
CVE-2026-43633 — Critical (CVSS 10.0): HestiaCP versions 1.9.0 through 1.9.4 contain a deserialization vulnerability in the web terminal component caused by a…
CVE-2026-33819 — Critical (CVSS 10.0): Deserialization of untrusted data in Microsoft Bing allows an unauthorized attacker to execute code over a network.

Browse all CWE-502 (Deserialization of Untrusted Data) vulnerabilities →