CVE-2026-81525 (GCVE-0-2026-81525)
Vulnerability from cvelistv5 – Published: 2026-08-27 18:32 – Updated: 2026-08-27 20:42
VLAI
EPSS
VEX
Title
Cross-tenant database retargeting via dot/NUL injection in namespace strings in the PHP Driver
Summary
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.
Severity
CWE
- CWE-943 - Improper Neutralization of Special Elements in Data Query Logic
Assigner
References
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| MongoDB | PHP Library |
Affected:
0 , < 1.21.4
(semver)
Affected: 2.0.0 , < 2.4.1 (semver) |
guessed | |
| MongoDB | PHP Extension |
Affected:
0 , < 1.21.6
(semver)
Affected: 2.0.0 , < 2.4.1 (semver) |
guessed |
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"product": "PHP Library",
"vendor": "MongoDB",
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"version": "0",
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},
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"status": "affected",
"version": "2.0.0",
"versionType": "semver"
}
]
},
{
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"versions": [
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"lessThan": "1.21.6",
"status": "affected",
"version": "0",
"versionType": "semver"
},
{
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"version": "2.0.0",
"versionType": "semver"
}
]
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}
],
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}
],
"metrics": [
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"cvssV4_0": {
"Automatable": "NOT_DEFINED",
"Recovery": "NOT_DEFINED",
"Safety": "NOT_DEFINED",
"attackComplexity": "LOW",
"attackRequirements": "NONE",
"attackVector": "NETWORK",
"baseScore": 8.6,
"baseSeverity": "HIGH",
"exploitMaturity": "NOT_DEFINED",
"privilegesRequired": "LOW",
"providerUrgency": "NOT_DEFINED",
"subAvailabilityImpact": "NONE",
"subConfidentialityImpact": "NONE",
"subIntegrityImpact": "NONE",
"userInteraction": "NONE",
"valueDensity": "NOT_DEFINED",
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"baseScore": 8.1,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N",
"version": "3.1"
},
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"value": "GENERAL"
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],
"problemTypes": [
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"descriptions": [
{
"cweId": "CWE-943",
"description": "CWE-943: Improper Neutralization of Special Elements in Data Query Logic",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-27T20:42:01.763Z",
"orgId": "a39b4221-9bd0-4244-95fc-f3e2e07f1deb",
"shortName": "mongodb"
},
"references": [
{
"url": "https://jira.mongodb.org/browse/PHPLIB-1927"
},
{
"url": "https://github.com/mongodb/mongo-php-library/releases/tag/1.21.4"
},
{
"url": "https://github.com/mongodb/mongo-php-library/releases/tag/2.4.1"
},
{
"url": "https://github.com/mongodb/mongo-php-driver/releases/tag/1.21.6"
},
{
"url": "https://github.com/mongodb/mongo-php-driver/releases/tag/2.4.1"
}
],
"source": {
"discovery": "INTERNAL"
},
"title": "Cross-tenant database retargeting via dot/NUL injection in namespace strings in the PHP Driver",
"x_generator": {
"engine": "Vulnogram 1.0.4"
}
}
},
"cveMetadata": {
"assignerOrgId": "a39b4221-9bd0-4244-95fc-f3e2e07f1deb",
"assignerShortName": "mongodb",
"cveId": "CVE-2026-81525",
"datePublished": "2026-08-27T18:32:26.493Z",
"dateReserved": "2026-08-26T22:14:05.297Z",
"dateUpdated": "2026-08-27T20:42:01.763Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"nvd": "{\"cve\":{\"id\":\"CVE-2026-81525\",\"sourceIdentifier\":\"cna@mongodb.com\",\"published\":\"2026-08-27T20:18:50.913\",\"lastModified\":\"2026-08-28T00:18:20.960\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"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.\"}],\"affected\":[{\"source\":\"cna@mongodb.com\",\"affectedData\":[{\"vendor\":\"MongoDB\",\"product\":\"PHP Library\",\"defaultStatus\":\"unaffected\",\"versions\":[{\"version\":\"0\",\"lessThan\":\"1.21.4\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"2.0.0\",\"lessThan\":\"2.4.1\",\"versionType\":\"semver\",\"status\":\"affected\"}]},{\"vendor\":\"MongoDB\",\"product\":\"PHP Extension\",\"defaultStatus\":\"unaffected\",\"versions\":[{\"version\":\"0\",\"lessThan\":\"1.21.6\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"2.0.0\",\"lessThan\":\"2.4.1\",\"versionType\":\"semver\",\"status\":\"affected\"}]}]}],\"metrics\":{\"cvssMetricV40\":[{\"source\":\"cna@mongodb.com\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"4.0\",\"vectorString\":\"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\",\"baseScore\":8.6,\"baseSeverity\":\"HIGH\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"attackRequirements\":\"NONE\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"vulnConfidentialityImpact\":\"HIGH\",\"vulnIntegrityImpact\":\"HIGH\",\"vulnAvailabilityImpact\":\"NONE\",\"subConfidentialityImpact\":\"NONE\",\"subIntegrityImpact\":\"NONE\",\"subAvailabilityImpact\":\"NONE\",\"exploitMaturity\":\"NOT_DEFINED\",\"confidentialityRequirement\":\"NOT_DEFINED\",\"integrityRequirement\":\"NOT_DEFINED\",\"availabilityRequirement\":\"NOT_DEFINED\",\"modifiedAttackVector\":\"NOT_DEFINED\",\"modifiedAttackComplexity\":\"NOT_DEFINED\",\"modifiedAttackRequirements\":\"NOT_DEFINED\",\"modifiedPrivilegesRequired\":\"NOT_DEFINED\",\"modifiedUserInteraction\":\"NOT_DEFINED\",\"modifiedVulnConfidentialityImpact\":\"NOT_DEFINED\",\"modifiedVulnIntegrityImpact\":\"NOT_DEFINED\",\"modifiedVulnAvailabilityImpact\":\"NOT_DEFINED\",\"modifiedSubConfidentialityImpact\":\"NOT_DEFINED\",\"modifiedSubIntegrityImpact\":\"NOT_DEFINED\",\"modifiedSubAvailabilityImpact\":\"NOT_DEFINED\",\"Safety\":\"NOT_DEFINED\",\"Automatable\":\"NOT_DEFINED\",\"Recovery\":\"NOT_DEFINED\",\"valueDensity\":\"NOT_DEFINED\",\"vulnerabilityResponseEffort\":\"NOT_DEFINED\",\"providerUrgency\":\"NOT_DEFINED\"}}],\"cvssMetricV31\":[{\"source\":\"cna@mongodb.com\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N\",\"baseScore\":8.1,\"baseSeverity\":\"HIGH\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"NONE\"},\"exploitabilityScore\":2.8,\"impactScore\":5.2}]},\"weaknesses\":[{\"source\":\"cna@mongodb.com\",\"type\":\"Secondary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-943\"}]}],\"references\":[{\"url\":\"https://github.com/mongodb/mongo-php-driver/releases/tag/1.21.6\",\"source\":\"cna@mongodb.com\"},{\"url\":\"https://github.com/mongodb/mongo-php-driver/releases/tag/2.4.1\",\"source\":\"cna@mongodb.com\"},{\"url\":\"https://github.com/mongodb/mongo-php-library/releases/tag/1.21.4\",\"source\":\"cna@mongodb.com\"},{\"url\":\"https://github.com/mongodb/mongo-php-library/releases/tag/2.4.1\",\"source\":\"cna@mongodb.com\"},{\"url\":\"https://jira.mongodb.org/browse/PHPLIB-1927\",\"source\":\"cna@mongodb.com\"}]}}"
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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