Critical

Oracle REST Data Services Backend-as-a-Service Unauthenticated Remote Takeover

IdentifiersCVE-2026-46840CWE-306· Missing Authentication for…

CVE-2026-46840 is a critical vulnerability in the Backend-as-a-Service component of Oracle REST Data Services (ORDS). Oracle states that supported ORDS versions 24.2.0 through 26.1.0 are affected. The flaw is remotely exploitable by an unauthenticated attacker with network access to the exposed service over HTTPS and requires no user interaction. Oracle characterizes the issue as easily exploitable and indicates that successful exploitation can compromise ORDS completely, resulting in takeover of Oracle REST Data Services. Oracle also notes a scope change, meaning exploitation may significantly impact additional products or dependent systems beyond the directly vulnerable ORDS instance. The published CVSS v3.1 vector is AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H with a base score of 10.0. Specific vulnerable functions or code paths were not provided in the available content.

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ANALYST BRIEF

Impact, mitigation & remediation

What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.

Impact

What an attacker gets, and what they’ve been doing with it.

Successful exploitation can result in full takeover of Oracle REST Data Services, with high impact to confidentiality, integrity, and availability. Because Oracle indicates scope change, compromise may extend beyond the vulnerable ORDS component and significantly affect additional connected or dependent products and systems.

Mitigation

If you can’t patch tonight, do this now.

If immediate patching is not possible, reduce exposure of ORDS HTTPS endpoints to untrusted networks, restrict network access to trusted clients or administrative paths only, and increase monitoring for exploitation attempts and signs of compromise. Because Oracle notes that temporary mitigations are not long-term substitutes for patching, these measures should be treated only as interim risk reduction until the vendor fix is applied.

Remediation

Patch, then assume compromise.

Apply Oracle's May 2026 security update / Critical Security Patch Update for Oracle REST Data Services and upgrade from affected versions 24.2.0 through 26.1.0 to the vendor-fixed release identified by Oracle. Oracle explicitly recommends immediate deployment of the patch set on supported systems.

PUBLIC EXPLOITS

Exploits

No valid public exploits. Mallory filtered out 1 candidate as fakes, detection scripts, or README-only repos.

VALID 0 / 1 TOTALView more in app

All candidate exploits were filtered out by Mallory's validation.

EXPOSURE SURFACE

Affected products & vendors

Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.

VendorProductType

OracleRest Data Servicesapplication

Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.

ACTIVITY FEED

Recent activity

14 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.

14 SOURCESView more in app

cyber security newsNews

May 29, 2026

Oracle Critical Security Update - Patch for 35 new Vulnerabilities Across Products

A critical vulnerability in Oracle REST Data Services Backend-as-a-Service component affecting ORDS versions 24.2.0 to 26.1.0, remotely exploitable over HTTPS without credentials and rated CVSS 10.0.

security online infoNews

May 29, 2026

Oracle Security Patch Updates: Critical Vulnerabilities

A critical Oracle REST Data Services Backend-as-a-Service vulnerability with CVSS 10.0 that allows remote attackers to fully compromise the service and may impact additional products.

cvefeed high severityNews

May 28, 2026

CVE-2026-46840 - Vulnerability in Oracle REST Data Services (compon

A critical, easily exploitable unauthenticated network vulnerability in Oracle REST Data Services Backend-as-a-Service component that can lead to full compromise/takeover of Oracle REST Data Services, with scope change to additional products.

What this page doesn’t show

The version that knows your environment.

This page is what’s public. Mallory adds the parts that aren’t: which of your assets are affected, which adversaries are exploiting it right now, which detections to deploy, and what to do tonight.

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Exposure mapping

Query your assets running an affected version, and investigate the blast radius.

Threat actor evidence

Every observed campaign linking this CVE to a named adversary.

Associated malware

Malware families riding this exploit, with evidence and IOCs.

Detection signatures

YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.

Vendor-by-vendor mapping

Cross-references every affected SKU, including bundled OEM variants.

Social activity9

Community discussion across Reddit, Mastodon, and other social sources.

EXTERNAL REFERENCES

MITRE CVE

cve.org · CVE-2026-46840

NVD

nvd.nist.gov/vuln/detail/CVE-2026-46840

MITRE CWE · CWE-306

Missing Authentication for Critical Function

Vendor Advisory

oracle.com/security-alerts/cspumay2026.html