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MongoDB PHP Driver EUVDEUVD-2026-67209

| CVE-2026-81525 HIGH
Improper Neutralization of Special Elements in Data Query Logic (CWE-943)
2026-08-27 mongodb
PHP Information Disclosure Nosql Injection Php Driver
8.6
CVSS 4.0 · Vendor: mongodb
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Severity by source

Vendor (mongodb) PRIMARY
8.6 HIGH
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
vuln.today AI
8.1 HIGH

Network-reachable via application input with low complexity; PR:L because attacker must control input to namespace construction; scope unchanged as redirection stays within the same MongoDB instance with no availability impact.

3.1 AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
4.0 AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

Primary rating from Vendor (mongodb).

CVSS VectorVendor: mongodb

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
X

Lifecycle Timeline

4
Patch available
Aug 27, 2026 - 22:03 EUVD
Source Code Evidence Fetched
Aug 27, 2026 - 20:44 vuln.today
Analysis Generated
Aug 27, 2026 - 20:44 vuln.today
CVE Published
Aug 27, 2026 - 18:32 cve.org
HIGH 8.6

DescriptionCVE.org

The MongoDB client library for PHP does not sufficiently sanitize special elements in application-supplied namespace identifiers before using them to construct the target namespace for database operations. An application that incorporates untrusted text into these identifiers may have operations silently directed at a different storage location than the one the application intended.

AnalysisAI

Namespace injection in the MongoDB PHP Library allows attackers with application-level access to silently redirect database operations to unintended collections or databases by supplying identifiers containing '.' or NUL byte characters. Applications using the MongoDB PHP Library before 2.4.1 or the MongoDB PHP Driver before 1.21.7 that incorporate untrusted text into namespace identifiers are affected, with high confidentiality and integrity risk confirmed by the CVSS 4.0 score of 8.6. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Obtain application-level access
Delivery
Supply crafted string containing '.' or NUL byte
Exploit
Application passes input to PHP library namespace construction
Execution
Library fails to sanitize and constructs unintended namespace
Persist
MongoDB operation silently targets wrong collection
Impact
Read or write unauthorized collection data
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Vulnerability AssessmentAI

Exploitation Exploitation requires that the target PHP application incorporates untrusted or user-supplied text directly into MongoDB database or collection name strings passed to the PHP library, without prior rejection of '.' or NUL byte characters. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N) yields a score of 8.6, driven by network accessibility, low attack complexity, and high confidentiality and integrity impact against the vulnerable system. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker with low-level access to a web application - such as an authenticated tenant user - submits a crafted record identifier or category name containing a '.' character into a field that the PHP application uses to construct a MongoDB collection name. The MongoDB PHP Library, without sanitization, incorporates the '.' into the namespace string and silently directs the query or write to an adjacent collection, potentially exposing documents belonging to other tenants or application modules. …
Remediation Upgrade the MongoDB PHP Library to version 2.4.1 or later using Composer: 'composer require mongodb/mongodb:2.4.1', as confirmed by the vendor release at https://github.com/mongodb/mongo-php-library/releases/tag/2.4.1. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours, inventory all applications and services using MongoDB PHP Library < 2.4.1 or MongoDB PHP Driver < 1.21.7, and identify which accept variable input for database or collection names. …

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EUVD-2026-67209 vulnerability details – vuln.today
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