Common Weakness Enumeration

CWE-502

Allowed

Deserialization of Untrusted Data

Abstraction: Base · Status: Draft

API response cwe.mitre.org

The product deserializes untrusted data without sufficiently ensuring that the resulting data will be valid.

5811 vulnerabilities reference this CWE, most recent first.

CVE-2026-49817 (GCVE-0-2026-49817)

Vulnerability from cvelistv5 – Published: 2026-08-19 14:47 – Updated: 2026-08-19 15:22
VLAI
Summary
Dell Command Update (DCU), versions prior to 5.7.1, contain a Deserialization of Untrusted Data vulnerability. A low privileged attacker with local access could potentially exploit this vulnerability, leading to Elevation of Privileges.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-19 15:22 UTC
CWE
  • CWE-502 - Deserialization of Untrusted Data
Assigner
dell CNA under the mitre root
CNA scorecard C 70/100 over 442 records in the last 180 days details
References
Impacted products
Vendor Product Version
Dell Dell Command Update (DCU) Affected: 0 , < 5.7.1 (semver)
Create a notification for this product.
Date Public
2026-08-18 14:45
Show details on NVD website
To clipboard 

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CVE-2026-49816 (GCVE-0-2026-49816)

Vulnerability from cvelistv5 – Published: 2026-08-19 14:49 – Updated: 2026-08-20 15:22
VLAI
Summary
Dell Command Update (DCU), versions prior to 5.7.1, contain a Deserialization of Untrusted Data vulnerability. A low privileged attacker with local access could potentially exploit this vulnerability, leading to Elevation of Privileges.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-20 14:46 UTC
CWE
  • CWE-502 - Deserialization of Untrusted Data
Assigner
dell CNA under the mitre root
CNA scorecard C 70/100 over 442 records in the last 180 days details
References
Impacted products
Vendor Product Version
Dell Dell Command Update (DCU) Affected: 0 , < 5.7.1 (semver)
Create a notification for this product.
Date Public
2026-08-18 14:47
Credits
Dell would like to thank PRL for reporting this issue.
Show details on NVD website
To clipboard 

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CVE-2026-49781 (GCVE-0-2026-49781)

Vulnerability from cvelistv5 – Published: 2026-06-15 20:19 – Updated: 2026-06-16 01:17
VLAI
Title
WordPress OttoKit plugin <= 1.1.27 - PHP Object Injection vulnerability
Summary
Unauthenticated PHP Object Injection in OttoKit <= 1.1.27 versions.
Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: yes Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-06-16 01:03 UTC
CWE
  • CWE-502 - Deserialization of Untrusted Data
Assigner
Patchstack CNA under the mitre root
CNA scorecard B 75/100 over 3017 records in the last 180 days details
References
Impacted products
Vendor Product Version
Brainstorm Force OttoKit Affected: n/a , ≤ 1.1.27 (custom)
Create a notification for this product.
Credits
daroo | Patchstack Bug Bounty Program
Show details on NVD website
To clipboard 

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CVE-2026-49770 (GCVE-0-2026-49770)

Vulnerability from cvelistv5 – Published: 2026-06-15 20:19 – Updated: 2026-06-16 01:18
VLAI
Title
WordPress WP Travel Engine plugin <= 6.7.12 - PHP Object Injection vulnerability
Summary
Unauthenticated PHP Object Injection in WP Travel Engine <= 6.7.12 versions.
Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: yes Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-06-16 01:04 UTC
CWE
  • CWE-502 - Deserialization of Untrusted Data
Assigner
Patchstack CNA under the mitre root
CNA scorecard B 75/100 over 3017 records in the last 180 days details
References
Impacted products
Vendor Product Version
WP Travel Engine WP Travel Engine Affected: n/a , ≤ 6.7.12 (custom)
Create a notification for this product.
Credits
daroo | Patchstack Bug Bounty Program
Show details on NVD website
To clipboard 

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CVE-2026-49769 (GCVE-0-2026-49769)

Vulnerability from cvelistv5 – Published: 2026-06-15 20:19 – Updated: 2026-06-16 15:38
VLAI
Title
WordPress wpForo Forum plugin <= 3.1.0 - PHP Object Injection vulnerability
Summary
Unauthenticated PHP Object Injection in wpForo Forum <= 3.1.0 versions.
Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: yes Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-06-16 15:38 UTC
CWE
  • CWE-502 - Deserialization of Untrusted Data
Assigner
Patchstack CNA under the mitre root
CNA scorecard B 75/100 over 3017 records in the last 180 days details
References
Impacted products
Vendor Product Version
Tomdever wpForo Forum Affected: n/a , ≤ 3.1.0 (custom)
Create a notification for this product.
Credits
daroo | Patchstack Bug Bounty Program
Show details on NVD website
To clipboard 

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CVE-2026-49768 (GCVE-0-2026-49768)

Vulnerability from cvelistv5 – Published: 2026-06-15 20:19 – Updated: 2026-06-16 14:42
VLAI
Title
WordPress Happyforms plugin <= 1.26.13 - PHP Object Injection vulnerability
Summary
Unauthenticated PHP Object Injection in Happyforms <= 1.26.13 versions.
Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: yes Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-06-16 14:39 UTC
CWE
  • CWE-502 - Deserialization of Untrusted Data
Assigner
Patchstack CNA under the mitre root
CNA scorecard B 75/100 over 3017 records in the last 180 days details
References
Impacted products
Vendor Product Version
Happyforms Happyforms Affected: n/a , ≤ 1.26.13 (custom)
Create a notification for this product.
Credits
longnv719 | Patchstack Bug Bounty Program
Show details on NVD website
To clipboard 

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CVE-2026-49765 (GCVE-0-2026-49765)

Vulnerability from cvelistv5 – Published: 2026-06-15 20:19 – Updated: 2026-06-16 12:21
VLAI
Title
WordPress Integration for Mailchimp and Contact Form 7, WPForms, Elementor, Ninja Forms plugin <= 1.1.8 - PHP Object Injection vulnerability
Summary
Unauthenticated PHP Object Injection in Integration for Mailchimp and Contact Form 7, WPForms, Elementor, Ninja Forms <= 1.1.8 versions.
Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: yes Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-06-16 12:21 UTC
CWE
  • CWE-502 - Deserialization of Untrusted Data
Assigner
Patchstack CNA under the mitre root
CNA scorecard B 75/100 over 3017 records in the last 180 days details
References
Impacted products
Credits
Frissi0n | Patchstack Bug Bounty Program
Show details on NVD website
To clipboard 

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CVE-2026-49763 (GCVE-0-2026-49763)

Vulnerability from cvelistv5 – Published: 2026-06-15 20:19 – Updated: 2026-07-08 19:43
VLAI
Title
WordPress Integration for Contact Form 7 HubSpot plugin <= 1.3.7 - PHP Object Injection vulnerability
Summary
Unauthenticated PHP Object Injection in Integration for Contact Form 7 HubSpot <= 1.3.7 versions.
Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: yes Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-06-16 12:50 UTC
CWE
  • CWE-502 - Deserialization of Untrusted Data
Assigner
Patchstack CNA under the mitre root
CNA scorecard B 75/100 over 3017 records in the last 180 days details
References
Impacted products
Vendor Product Version
CRM Perks Integration for Contact Form 7 HubSpot Affected: n/a , ≤ 1.3.7 (custom)
Create a notification for this product.
Credits
Frissi0n | Patchstack Bug Bounty Program
Show details on NVD website
To clipboard 

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CVE-2026-49740 (GCVE-0-2026-49740)

Vulnerability from cvelistv5 – Published: 2026-06-09 10:53 – Updated: 2026-07-15 12:49
VLAI
Title
TYPO3 CMS - Insecure Deserialization in Core API
Summary
TYPO3's cache frontend (VariableFrontend) and persistent key-value store (Registry) deserialized PHP payloads without integrity validation or class restrictions. An attacker with write access to the underlying storage backend (cache store or sys_registry database table) could inject a crafted serialized payload to trigger PHP Object Injection, potentially exploiting a gadget chain to achieve Remote Code Execution or other high-impact effects. Exploiting this vulnerability requires direct local write access to the storage, such as the SQL database or file system. This issue affects TYPO3 CMS versions before 10.4.57, 11.0.0-11.5.50, 12.0.0-12.4.45, 13.0.0-13.4.30 and 14.0.0-14.3.2.
Severity
6.3 (Medium)
CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:H/SI:H/SA:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-06-09 13:40 UTC
CWE
  • CWE-502 - Deserialization of Untrusted Data
Assigner
TYPO3 CNA under the mitre root
CNA scorecard B 83/100 over 67 records in the last 180 days details
References
Impacted products
Vendor Product Version
TYPO3 TYPO3 CMS Affected: 0 , < 10.4.57 (semver)
Affected: 11.0.0 , < 11.5.51 (semver)
Affected: 12.0.0 , < 12.4.46 (semver)
Affected: 13.0.0 , < 13.4.31 (semver)
Affected: 14.0.0 , < 14.3.3 (semver)
    cpe:2.3:a:typo3:typo3:*:*:*:*:*:*:*:*
    cpe:2.3:a:typo3:typo3:*:*:*:*:*:*:*:*
    cpe:2.3:a:typo3:typo3:*:*:*:*:*:*:*:*
    cpe:2.3:a:typo3:typo3:*:*:*:*:*:*:*:*
    cpe:2.3:a:typo3:typo3:*:*:*:*:*:*:*:*
Create a notification for this product.
Credits
z3rco Chowdhury Faizal Ahammed Rick Larabee Vitaly Simonovich Nozomu Sasaki Mert Akdag tikket Shafi Almutairi Oliver Hader
Show details on NVD website
To clipboard 

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CVE-2026-49400 (GCVE-0-2026-49400)

Vulnerability from cvelistv5 – Published: 2026-09-14 17:15 – Updated: 2026-09-16 15:21
VLAI
Title
October CMS: PHP Object Injection via Backend Widget Session Storage
Summary
October System provides the system module for October Content Management System. Prior to versions 3.7.17 and 4.2.21, the backend `SessionMaker` trait stored widget session state as `base64(serialize(...))` and consumed it with `unserialize()` without an `allowed_classes` restriction. Any code path that could write to a `widget.*` session key with attacker-controlled bytes could trigger PHP object injection the next time the widget read its session state, allowing instantiation of arbitrary classes and reachable PHP gadget chains. This issue only affects installations running with `cms.safe_mode` enabled. Safe Mode is a niche opt-in feature, primarily used for demo installations and multi-tenant or shared-editor scenarios where untrusted users are deliberately granted access to the CMS markup editor. In standard production deployments Safe Mode is off, backend access is restricted to trusted administrators, and a markup editor can already execute arbitrary PHP directly. The session-write path that reaches this sink is gated by the Safe Mode sandbox, so installations without Safe Mode enabled are not exposed. Scope of impact is narrow even with Safe Mode enabled. The standard backend code paths that populate widget session state (search terms, sort options, selected IDs, filter values) wrap the input inside a known array shape before serializing, so user-supplied values never reach `unserialize()` as a controllable serialized payload. Exploitation requires the Safe Mode session-write path together with a suitable PHP gadget chain reachable from the installed dependency set. The hardening below removes the underlying object-injection sink so the class of issue is closed off regardless. The vulnerability has been patched in v3.7.17 and v4.2.21. Two changes were applied. `Backend\Traits\SessionMaker` now stores widget session state as plain JSON instead of `base64(serialize(...))`, eliminating the object-injection sink entirely for new writes. Reads transparently fall back to the legacy format for one upgrade cycle so existing sessions retain their saved widget state. The legacy `unserialize()` fallback path now sets `allowed_classes => false`, so even values written before the upgrade cannot instantiate objects. As a workaround, restrict CMS markup editing access to fully trusted administrators only, the standard October CMS recommendation for any deployment.
Severity
3.3 (Low)
CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:L/I:L/A:N
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-16 15:21 UTC
CWE
  • CWE-502 - Deserialization of Untrusted Data
Assigner
GitHub_M CNA under the mitre root
CNA scorecard C 72/100 over 7664 records in the last 180 days details
References
Impacted products
Vendor Product Version
octobercms october Affected: < 3.7.17
Affected: >= 4.0.0, < 4.2.23
Create a notification for this product.
Show details on NVD website
To clipboard 

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Mitigation
Architecture and Design Implementation

If available, use the signing/sealing features of the programming language to assure that deserialized data has not been tainted. For example, a hash-based message authentication code (HMAC) could be used to ensure that data has not been modified.

Mitigation
Implementation

When deserializing data, populate a new object rather than just deserializing. The result is that the data flows through safe input validation and that the functions are safe.

Mitigation
Implementation

Explicitly define a final object() to prevent deserialization.

Mitigation
Architecture and Design Implementation
  • Make fields transient to protect them from deserialization.
  • An attempt to serialize and then deserialize a class containing transient fields will result in NULLs where the transient data should be. This is an excellent way to prevent time, environment-based, or sensitive variables from being carried over and used improperly.
Mitigation
Implementation

Avoid having unnecessary types or gadgets (a sequence of instances and method invocations that can self-execute during the deserialization process, often found in libraries) available that can be leveraged for malicious ends. This limits the potential for unintended or unauthorized types and gadgets to be leveraged by the attacker. Add only acceptable classes to an allowlist. Note: new gadgets are constantly being discovered, so this alone is not a sufficient mitigation.

Mitigation
Architecture and Design Implementation

Employ cryptography of the data or code for protection. However, it's important to note that it would still be client-side security. This is risky because if the client is compromised then the security implemented on the client (the cryptography) can be bypassed.

Mitigation MIT-29
Operation

Strategy: Firewall

Use an application firewall that can detect attacks against this weakness. It can be beneficial in cases in which the code cannot be fixed (because it is controlled by a third party), as an emergency prevention measure while more comprehensive software assurance measures are applied, or to provide defense in depth [REF-1481].

CAPEC-586: Object Injection

An adversary attempts to exploit an application by injecting additional, malicious content during its processing of serialized objects. Developers leverage serialization in order to convert data or state into a static, binary format for saving to disk or transferring over a network. These objects are then deserialized when needed to recover the data/state. By injecting a malformed object into a vulnerable application, an adversary can potentially compromise the application by manipulating the deserialization process. This can result in a number of unwanted outcomes, including remote code execution.

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