Common Weakness Enumeration
CWE-502
AllowedDeserialization of Untrusted Data
Abstraction: Base · Status: Draft
The product deserializes untrusted data without sufficiently ensuring that the resulting data will be valid.
5811 vulnerabilities reference this CWE, most recent first.
CVE-2026-43642 (GCVE-0-2026-43642)
Vulnerability from cvelistv5 – Published: 2026-09-22 17:53 – Updated: 2026-10-01 19:19
VLAI
EPSS
VEX
Title
Softaculous Virtualizor PHP Object Injection via Billing Module Handler
Summary
Softaculous Virtualizor before 3.2.9 (Patch 9) and 3.0.0 contains a PHP object injection vulnerability in the billing module handler that allows unauthenticated remote attackers to supply arbitrary serialized PHP objects for deserialization by setting the act parameter to login with the from_billing_module parameter present. Attackers can pass malicious serialized data through the billing_data POST field to the unserialize() function without allowed_classes restrictions, enabling exploitation of available POP chains to achieve remote code execution as root.
Severity
8.1 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-25 23:54 UTC
CWE
- CWE-502 - Deserialization of Untrusted Data
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://www.vulncheck.com/blog/virtualizor-billin… | technical-descriptionexploit |
| https://www.virtualizor.com/blog/virtualizor-3-2-… | release-notespatch |
| https://www.virtualizor.com/blog/virtualizor-3-3-0/ | release-notespatch |
| https://www.vulncheck.com/advisories/softaculous-… | third-party-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Softaculous | Virtualizor |
Affected:
0 , < 3.2.9 (Patch 9)
(custom)
Unaffected: 3.0.0 (semver) cpe:2.3:a:softaculous:virtualizor:*:*:*:*:*:*:*:* |
Date Public
2026-09-01 00:00
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CVE-2026-43633 (GCVE-0-2026-43633)
Vulnerability from cvelistv5 – Published: 2026-05-19 13:29 – Updated: 2026-07-14 20:01 X_Open Source
VLAI
EPSS
VEX
Title
HestiaCP 1.9.0-1.9.4 Deserialization RCE via Web Terminal
Summary
HestiaCP versions 1.9.0 through 1.9.4 contain a deserialization vulnerability in the web terminal component caused by a session format mismatch between PHP and Node.js that allows unauthenticated remote attackers to achieve root-level code execution. Attackers can inject crafted data into HTTP headers that are processed by the PHP session handler but incorrectly deserialized by the Node.js web terminal component as trusted session values, resulting in arbitrary command execution on systems with the web terminal feature enabled.
Severity
10 (Critical)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-05-19 13:59 UTC
CWE
- CWE-502 - Deserialization of Untrusted Data
Assigner
References
5 references
| URL | Tags |
|---|---|
| https://mercuryiss.com.au/hestiacp-unauthenticate… | technical-descriptionexploit |
| https://github.com/hestiacp/hestiacp/issues/5229 | issue-tracking |
| https://github.com/hestiacp/hestiacp/pull/5244 | issue-tracking |
| https://github.com/hestiacp/hestiacp/commit/854d7… | patch |
| https://www.vulncheck.com/advisories/hestiacp-des… | third-party-advisory |
Impacted products
Date Public
2026-03-09 00:00
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CVE-2026-42779 (GCVE-0-2026-42779)
Vulnerability from cvelistv5 – Published: 2026-05-01 10:00 – Updated: 2026-05-02 03:55
VLAI
EPSS
VEX
Title
Apache MINA: AbstractIoBuffer.resolveClass() null-clazz Branch Skips acceptMatchers Filter — Full Object Deserialization RCE (take 2)
Summary
The fix for CVE-2026-41635 was not applied to the 2.1.X and 2.2.X branches. Here was the original issue description:
Apache MINA's AbstractIoBuffer.resolveClass() contains two branches, one of them (for static classes or primitive types) does not check the class at all, bypassing the classname allowlist and allowing arbitrary code to be executed.
The fix checks if the class is present in the accepted class filter before calling Class.forName().
Affected versions are Apache MINA 2.1.0 <= 2.1.11, and 2.2.0 <= 2.2.6.
The problem is resolved in Apache MINA 2.1.12, and 2.2.7 by
applying the classname allowlist earlier.
Affected are applications using Apache MINA that call IoBuffer.getObject().
Applications using Apache MINA are advised to upgrade.
Severity
9.8 (Critical)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-05-01 00:00 UTC
CWE
- CWE-502 - Deserialization of Untrusted Data
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://lists.apache.org/thread/fhlx5k91hrkgyzh7y… | vendor-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Apache Software Foundation | Apache MINA |
Affected:
2.2.X , ≤ 2.2.6
(semver)
Affected: 2.1.X , ≤ 2.1.11 (semver) |
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CVE-2026-42778 (GCVE-0-2026-42778)
Vulnerability from cvelistv5 – Published: 2026-05-01 10:01 – Updated: 2026-05-02 03:55
VLAI
EPSS
VEX
Title
Apache MINA: CWE-502 Deserialization of Untrusted Data (take 2)
Summary
The fix for CVE-2026-41409 was not applied to the 2.1.X and 2.2.X branches. Here was the original issue description:
The fix for CVE-2024-52046 in Apache MINA AbstractIoBuffer.getObject() was incomplete. The classname allowlist of classes allowed to be deserialized was applied too late after a static initializer in a class to be read might already have been executed.
Affected versions are Apache MINA 2.1.0 <= 2.1.11, and 2.2.0 <= 2.2.6.
The problem is resolved in Apache MINA 2.1.12, and 2.2.7 by
applying the classname allowlist earlier.
Affected are applications using Apache MINA that call IoBuffer.getObject().
Applications using Apache MINA are advised to upgrade
The fix for CVE-2024-52046 in Apache MINA AbstractIoBuffer.getObject() was incomplete. The classname allowlist of classes allowed to be deserialized was applied too late after a static initializer in a class to be read might already have been executed.
Affected versions are Apache MINA 2.1.0 <= 2.1.110, and 2.2.0 <= 2.2.6.
The problem is resolved in Apache MINA 2.1.12, and 2.2.7 by
applying the classname allowlist earlier.
Affected are applications using Apache MINA that call IoBuffer.getObject().
Applications using Apache MINA are advised to upgrade
Severity
9.8 (Critical)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-05-01 00:00 UTC
CWE
- CWE-502 - Deserialization of Untrusted Data
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://lists.apache.org/thread/fhlx5k91hrkgyzh7y… | vendor-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Apache Software Foundation | Apache MINA |
Affected:
2.2.X , ≤ 2.2.6
(semver)
Affected: 2.1.X , ≤ 2.1.11 (semver) |
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CVE-2026-42723 (GCVE-0-2026-42723)
Vulnerability from cvelistv5 – Published: 2026-10-10 19:35 – Updated: 2026-10-11 11:53
VLAI
EPSS
VEX
Title
WordPress CleanSkin theme <= 1.5.0 - PHP Object Injection vulnerability
Summary
Unauthenticated PHP Object Injection in CleanSkin <= 1.5.0 versions.
Severity
9.8 (Critical)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-11 11:50 UTC
CWE
- CWE-502 - Deserialization of Untrusted Data
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://patchstack.com/database/wordpress/theme/c… | vdb-entry |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| AncoraThemes | CleanSkin |
Affected:
n/a , ≤ 1.5.0
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CVE-2026-42719 (GCVE-0-2026-42719)
Vulnerability from cvelistv5 – Published: 2026-10-10 19:35 – Updated: 2026-10-11 12:13
VLAI
EPSS
VEX
Title
WordPress Dynamic User Directory plugin <= 2.4 - PHP Object Injection vulnerability
Summary
Subscriber PHP Object Injection in Dynamic User Directory <= 2.4 versions.
Severity
9.8 (Critical)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-11 11:56 UTC
CWE
- CWE-502 - Deserialization of Untrusted Data
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://patchstack.com/database/wordpress/plugin/… | vdb-entry |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Sarah Giles | Dynamic User Directory |
Affected:
n/a , ≤ 2.4
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CVE-2026-42718 (GCVE-0-2026-42718)
Vulnerability from cvelistv5 – Published: 2026-10-10 19:35 – Updated: 2026-10-11 11:53
VLAI
EPSS
VEX
Title
WordPress Booster for WooCommerce plugin <= 8.4.0 - PHP Object Injection vulnerability
Summary
Unauthenticated PHP Object Injection in Booster for WooCommerce <= 8.4.0 versions.
Severity
9.8 (Critical)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-11 11:50 UTC
CWE
- CWE-502 - Deserialization of Untrusted Data
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://patchstack.com/database/wordpress/plugin/… | vdb-entry |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Pluggabl | Booster for WooCommerce |
Affected:
n/a , ≤ 8.4.0
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CVE-2026-42716 (GCVE-0-2026-42716)
Vulnerability from cvelistv5 – Published: 2026-10-10 19:35 – Updated: 2026-10-11 11:53
VLAI
EPSS
VEX
Title
WordPress Payever - WooCommerce Gateway plugin <= 4.8.2 - PHP Object Injection vulnerability
Summary
Unauthenticated PHP Object Injection in Payever - WooCommerce Gateway <= 4.8.2 versions.
Severity
9.8 (Critical)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-11 11:50 UTC
CWE
- CWE-502 - Deserialization of Untrusted Data
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://patchstack.com/database/wordpress/plugin/… | vdb-entry |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| payever | Payever - WooCommerce Gateway |
Affected:
n/a , ≤ 4.8.2
(custom)
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CVE-2026-42687 (GCVE-0-2026-42687)
Vulnerability from cvelistv5 – Published: 2026-06-15 20:18 – Updated: 2026-06-16 01:24
VLAI
EPSS
VEX
Title
WordPress EventPrime plugin <= 4.3.2.1 - PHP Object Injection vulnerability
Summary
Unauthenticated PHP Object Injection in EventPrime <= 4.3.2.1 versions.
Severity
8.1 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-06-16 01:09 UTC
CWE
- CWE-502 - Deserialization of Untrusted Data
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://patchstack.com/database/wordpress/plugin/… | vdb-entry |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| EventPrime | EventPrime |
Affected:
n/a , ≤ 4.3.2.1
(custom)
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CVE-2026-42527 (GCVE-0-2026-42527)
Vulnerability from cvelistv5 – Published: 2026-07-06 07:55 – Updated: 2026-07-06 18:47
VLAI
EPSS
VEX
Title
Apache Camel: Permissive default ObjectInputFilter pattern admits java.net.** and enables DNS-based information disclosure
Summary
Deserialization of Untrusted Data vulnerability in Apache Camel.
The default ObjectInputFilter pattern shipped with several Apache Camel components for defense-in-depth deserialization filtering ('java.**;javax.**;org.apache.camel.**;!*', or the no-'javax.**' variant in the aggregation-repository components) uses a recursive 'java.**' glob that admits classes whose hashCode/equals/readObject methods perform network I/O, notably java.net.URL and java.net.InetAddress. When an attacker can deliver a Java-serialized payload to an affected Camel consumer, deserialization of a HashMap (or any collection that calls hashCode on its elements) containing java.net.URL keys causes the JVM to issue DNS queries to the attacker-supplied host during the deserialization side-effect. The class-level filter check passes because the resulting object's class (HashMap) is allow-listed; the DNS query is observable on an attacker-controlled DNS server, providing an out-of-band side channel. The exposure is highest on the camel-jms family because JmsBinding.extractBodyFromJms invokes ObjectMessage.getObject() unconditionally when mapJmsMessage=true (default). Affected components: camel-jms, camel-sjms, camel-amqp, camel-mina, camel-netty, camel-netty-http, camel-vertx-http, camel-infinispan, and the aggregation repository components camel-leveldb, camel-cassandraql, camel-consul, camel-sql (JDBC aggregation repository).
This issue affects Apache Camel: from 4.14.0 before 4.14.8, from 4.15.0 before 4.18.3, from 4.19.0 before 4.21.0.
Users are recommended to upgrade to a version that contains the CAMEL-23372 fix once available: 4.21.0 for the 4.21.x line, 4.18.3 for the 4.18.x line, and 4.14.8 for the 4.14.x line. For deployments that cannot upgrade immediately, configure a JMS-provider-side allow-list (Apache ActiveMQ Artemis 'deserializationAllowList' / 'deserializationDenyList', Apache ActiveMQ Classic 'org.apache.activemq.SERIALIZABLE_PACKAGES') as the primary mitigation, and/or override the in-code default via the endpoint-level 'deserializationFilter' option or the JVM-wide '-Djdk.serialFilter' system property with an explicit deny: '!java.net.**;java.**;javax.**;org.apache.camel.**;!*' (or '!java.net.**;java.**;org.apache.camel.**;!*' for the aggregation-repository components, which do not include javax.**).
Severity
8.1 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-06 18:47 UTC
CWE
- CWE-502 - Deserialization of Untrusted Data
Assigner
References
2 references
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Apache Software Foundation | Apache Camel |
Affected:
4.14.0 , < 4.14.8
(semver)
Affected: 4.15.0 , < 4.18.3 (semver) Affected: 4.19.0 , < 4.21.0 (semver) |
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"cveId": "CVE-2026-42527",
"datePublished": "2026-07-06T07:55:06.159Z",
"dateReserved": "2026-04-28T11:50:34.288Z",
"dateUpdated": "2026-07-06T18:47:30.650Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
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.