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VulnerabilityPublished Updated

CVE-2026-35300: Oracle WebLogic Server · Deserialization of Untrusted Data

Affects Oracle WebLogic ServerSource CVE Database V5

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Not known to be exploited · CVSS 9.8 Critical.

Data as of 30 Oct 2026, 20:25 UTC

CVSS 3.1 base score
9.8Critical
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.5% chance of exploitation in 30 days – higher than 46% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 16 Jun 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 30 Oct 2026.

What to do

Affected software

ProductAffectedFixed in
Oracle CorporationWebLogic ServerAffected
  • 12.2.1.4.0 – 15.1.1.0.0
4 affected builds
Fixed in–
Mavencom.oracle.weblogic/weblogic-serverpkg:maven/com.oracle.weblogic/weblogic-serverOther threatsAffected
  • 12.2.1.4.0 – 15.1.1.0.0
4 affected builds
Fixed in–

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

Oracle has released a Critical Security Patch Update in June 2026 that addresses this vulnerability. Customers should apply the provided security patches as soon as possible to remediate the issue. Until patches are applied, risk can be partially mitigated by blocking network protocols required for the attack and by removing unnecessary privileges from users who do not require them. However, these mitigations may impact application functionality. Oracle strongly recommends staying on actively supported versions and applying security patches without delay. Patch status is not explicitly stated in the advisory but is implied by the availability of the Critical Security Patch Update.

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).

References

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