CVE-2026-122053 (GCVE-0-2026-122053)
Vulnerability from cvelistv5 – Published: 2026-11-06 16:46 – Updated: 2026-11-06 20:39
VLAI
EPSS
VEX
Title
Symfony: ObjectNormalizer Dotted-Key Property-Path Traversal Bypasses #[Ignore] on Nested Objects
Summary
The Symfony Serializer component ObjectNormalizer treats any attribute name containing . (and, from Symfony 6.4, [) as a writable property path, allowing untrusted input to modify properties of nested objects and bypass their #[Ignore] metadata attribute in Symfony versions 5.4.41 prior to 5.4.56, 6.4.9 prior to 6.4.50, 7.0.9 prior to 7.1.0, 7.1.2 prior to 7.4.23, and 8.x prior to 8.1.11.
ObjectNormalizer::isAllowedAttribute() accepts such names, and setAttributeValue() hands the name straight to PropertyAccessor::setValue(), which parses it as a property path and traverses into the nested object. A payload key such as customer.admin writes to $order->customer->admin. The #[Ignore] metadata attribute is only consulted when the nested object is denormalized in its own right, never when it is reached through a path. #[Groups] restrictions are not bypassed: the path is only accepted when no groups are passed in the context, and then groups restrict nothing. When the root class carries neither #[Ignore] nor #[Groups], no allowlist applies and every key of the payload is let through. Because PropertyAccessor also resolves a path segment against public methods, a segment matching a public method name invokes that method with the attacker’s value.Applications that bind untrusted input to objects are affected, including controllers using #[MapRequestPayload] or #[MapQueryString], whose default normalizer is ObjectNormalizer. With OBJECT_TO_POPULATE, as used for partial updates, the traversal reaches an already hydrated entity graph, and the modified field may be persisted.
The fix accepts a property path only when the class metadata declares an attribute of that exact name. Declared paths keep working unchanged, and a path in the payload with no matching declaration is ignored.
Severity
6.5 (Medium)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-11-06 20:39 UTC
CWE
- CWE-915 - Improperly controlled modification of Dynamically-Determined object attributes
Assigner
Checkmarx
CNA
References
3 references
| URL | Tags |
|---|---|
| https://github.com/symfony/symfony/security/advis… | third-party-advisory |
| https://github.com/symfony/symfony/commit/fcaf87a… | patch |
| https://github.com/symfony/symfony/commit/9f73906… | patch |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| sensiolabs | symfony |
Affected:
5.4.41 , < 5.4.56
(git)
Affected: 6.4.9 , < 6.4.50 (git) Affected: 7.0.9 , < 7.1.0 (git) Affected: 7.1.2 , < 7.4.23 (git) Affected: 8.0.0 , < 8.1.11 (git) cpe:2.3:a:sensiolabs:symfony:*:*:*:*:*:*:*:* cpe:2.3:a:sensiolabs:symfony:*:*:*:*:*:*:*:* cpe:2.3:a:sensiolabs:symfony:*:*:*:*:*:*:*:* cpe:2.3:a:sensiolabs:symfony:*:*:*:*:*:*:*:* cpe:2.3:a:sensiolabs:symfony:*:*:*:*:*:*:*:* |
Date Public
2026-11-06 16:46
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"vulnConfidentialityImpact": "LOW",
"vulnIntegrityImpact": "LOW",
"vulnerabilityResponseEffort": "NOT_DEFINED"
},
"format": "CVSS",
"scenarios": [
{
"lang": "en",
"value": "GENERAL"
}
]
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-915",
"description": "CWE-915 Improperly controlled modification of Dynamically-Determined object attributes",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-11-06T16:51:02.357Z",
"orgId": "596c5446-0ce5-4ba2-aa66-48b3b757a647",
"shortName": "Checkmarx"
},
"references": [
{
"tags": [
"third-party-advisory"
],
"url": "https://github.com/symfony/symfony/security/advisories/GHSA-hqp2-7rr8-hf26"
},
{
"tags": [
"patch"
],
"url": "https://github.com/symfony/symfony/commit/fcaf87a93c7fa5b7fe9e9e8382d4ed0d0c52c67c"
},
{
"tags": [
"patch"
],
"url": "https://github.com/symfony/symfony/commit/9f7390678a255f7962fb1c81c42b26fa907d3437"
}
],
"source": {
"advisory": "GHSA-hqp2-7rr8-hf26",
"discovery": "UNKNOWN"
},
"title": "Symfony: ObjectNormalizer Dotted-Key Property-Path Traversal Bypasses #[Ignore] on Nested Objects",
"x_generator": {
"engine": "Vulnogram 1.0.5"
}
}
},
"cveMetadata": {
"assignerOrgId": "596c5446-0ce5-4ba2-aa66-48b3b757a647",
"assignerShortName": "Checkmarx",
"cveId": "CVE-2026-122053",
"datePublished": "2026-11-06T16:46:46.986Z",
"dateReserved": "2026-11-04T16:22:10.624Z",
"dateUpdated": "2026-11-06T20:39:54.876Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.
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.
Vulnerability timeline
Sightings and recorded dates, grouped by day · UTC
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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.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.