CVE-2026-54569

SENAITE.CORE is the core framework for the SENAITE laboratory information management system. From 2.0.0 to 2.6.0, the SENAITE.CORE JSON API permits unauthenticated remote code execution through a two-request chain involving missing authorization and unsafe evaluation. The state-changing routes in src/bika/lims/jsonapi/update.py, including update, update_many, remove, doActionFor, doActionFor_many, and getusers, do not enforce the senaite.core: Access JSON API permission before resolving attacker-selected objects. In src/bika/lims/jsonapi/init.py, set_fields_from_request passes raw request values for RecordsField and RecordField instances to eval() before field mutator write-permission checks execute. An anonymous attacker can discover the bika_setup object identifier through @@uuid, send a value such as RejectionReasons to /@@API/update, and execute arbitrary Python in the Zope worker before a later mutation failure rolls back ZODB changes. The same unsafe evaluation pattern is present in src/senaite/core/browser/fields/record.py and src/senaite/core/browser/fields/records.py. Successful exploitation can expose or modify laboratory data, files, and accounts and can disrupt the service.

SENAITE.CORE is the core framework for the SENAITE laboratory information management system. From 2.0.0 to 2.6.0, the SENAITE.CORE JSON API permits unauthenticated remote code execution through a two-request chain involving missing authorization and unsafe evaluation. The state-changing routes in src/bika/lims/jsonapi/update.py, including update, update_many, remove, doActionFor, doActionFor_many, and getusers, do not enforce the senaite.core: Access JSON API permission before resolving attacker-selected objects. In src/bika/lims/jsonapi/init.py, set_fields_from_request passes raw request values for RecordsField and RecordField instances to eval() before field mutator write-permission checks execute. An anonymous attacker can discover the bika_setup object identifier through @@uuid, send a value such as RejectionReasons to /@@API/update, and execute arbitrary Python in the Zope worker before a later mutation failure rolls back ZODB changes. The same unsafe evaluation pattern is present in src/senaite/core/browser/fields/record.py and src/senaite/core/browser/fields/records.py. Successful exploitation can expose or modify laboratory data, files, and accounts and can disrupt the service.

Summary

An unauthenticated remote code execution vulnerability in the SENAITE JSON API allows any network-reachable attacker to execute arbitrary Python on the Zope worker process via a two-request anonymous chain. The /@@API/update route is reachable to anonymous callers and runs eval() on attacker-controlled input before any permission check fires.

This is a different code path from the eval() in the calculations module: no authenticated account of any kind is required.

Details

The vulnerability is the chain of two independent flaws. Either fix alone breaks the unauthenticated chain, but the eval sink remains exploitable by any authenticated user with write access to a RecordsField, so both fixes are needed.

1. Missing AccessJSONAPI gate on JSON API write routes (CWE-862). The route at src/bika/lims/jsonapi/update.py:45-165 does not enforce the senaite.core: Access JSON API permission upfront. Compare with the sibling create.py:179-182, which does:

if not getSecurityManager().checkPermission(AccessJSONAPI, parent):
    raise Unauthorized(...)

The check is present on create and absent on update, update_many, remove, doActionFor, doActionFor_many, and getusers. The underlying @@API view is registered by plone.jsonapi.core at browser/configure.zcml:8-13 with permission="zope2.View", which is granted to Anonymous on the Plone Site root.

When an obj_uid is supplied, the route resolves the target through uid_catalog and brain.getObject(). The catalog brain walks the parent path with unrestrictedTraverse and applies restrictedTraverse only on the final segment, so the per-object View permission is enforced on the target. The chain is reachable to anonymous because bika_setup is anonymous-readable on a stock Plone Site (the View permission is acquired from the Plone Site root, which grants View to Anonymous by default).

2. eval() on RecordsField / RecordField values inside set_fields_from_request (CWE-95). Once an object has been resolved, set_fields_from_request in jsonapi/__init__.py:199-252 iterates the request fields. For any field of type RecordsField or RecordField, the helper runs eval(value) on the raw request string at line 240, before the field mutator and its write_permission check execute:

elif fieldtype in ['senaite.core.browser.fields.records.RecordsField',
                   'senaite.core.browser.fields.record.RecordField']:
    try:
        value = eval(value)
    except Exception:
        logger.warning(
            "JSONAPI: " + fieldname + ": Invalid "
            "JSON/Python variable")
        return []

The eval runs in the Zope worker process with full Python builtins available, so a payload such as __import__('os').popen('id').read() executes arbitrary system commands. The transaction savepoint inside update.py rolls back ZODB writes when the mutator subsequently fails, but Python side effects (subprocess, urllib calls, file I/O outside ZODB) have already happened and are not reverted.

The same eval() pattern is also present in the field setters at record.py:253-262 and records.py:135-143.

Anonymous UID discovery. The bika_setup object exposes two…

SENAITE.CORE is the core framework for the SENAITE laboratory information management system. From 2.0.0 to 2.6.0, the SENAITE.CORE JSON API permits unauthenticated remote code execution through a two-request chain involving missing authorization and unsafe evaluation. The state-changing routes in src/bika/lims/jsonapi/update.py, including update, update_many, remove, doActionFor, doActionFor_many, and getusers, do not enforce the senaite.core: Access JSON API permission before resolving attacker-selected objects. In src/bika/lims/jsonapi/init.py, set_fields_from_request passes raw request values for RecordsField and RecordField instances to eval() before field mutator write-permission checks execute. An anonymous attacker can discover the bika_setup object identifier through @@uuid, send a value such as RejectionReasons to /@@API/update, and execute arbitrary Python in the Zope worker before a later mutation failure rolls back ZODB changes. The same unsafe evaluation pattern is present in src/senaite/core/browser/fields/record.py and src/senaite/core/browser/fields/records.py. Successful exploitation can expose or modify laboratory data, files, and accounts and can disrupt the service.

SENAITE.CORE is the core framework for the SENAITE laboratory information management system. From 2.0.0 to 2.6.0, the SENAITE.CORE JSON API permits unauthenticated remote code execution through a two-request chain involving missing authorization and unsafe evaluation. The state-changing routes in src/bika/lims/jsonapi/update.py, including update, update_many, remove, doActionFor, doActionFor_many, and getusers, do not enforce the senaite.core: Access JSON API permission before resolving attacker-selected objects. In src/bika/lims/jsonapi/init.py, set_fields_from_request passes raw request values for RecordsField and RecordField instances to eval() before field mutator write-permission checks execute. An anonymous attacker can discover the bika_setup object identifier through @@uuid, send a value such as RejectionReasons to /@@API/update, and execute arbitrary Python in the Zope worker before a later mutation failure rolls back ZODB changes. The same unsafe evaluation pattern is present in src/senaite/core/browser/fields/record.py and src/senaite/core/browser/fields/records.py. Successful exploitation can expose or modify laboratory data, files, and accounts and can disrupt the service.

Summary

An unauthenticated remote code execution vulnerability in the SENAITE JSON API allows any network-reachable attacker to execute arbitrary Python on the Zope worker process via a two-request anonymous chain. The /@@API/update route is reachable to anonymous callers and runs eval() on attacker-controlled input before any permission check fires.

This is a different code path from the eval() in the calculations module: no authenticated account of any kind is required.

Details

The vulnerability is the chain of two independent flaws. Either fix alone breaks the unauthenticated chain, but the eval sink remains exploitable by any authenticated user with write access to a RecordsField, so both fixes are needed.

1. Missing AccessJSONAPI gate on JSON API write routes (CWE-862). The route at src/bika/lims/jsonapi/update.py:45-165 does not enforce the senaite.core: Access JSON API permission upfront. Compare with the sibling create.py:179-182, which does:

if not getSecurityManager().checkPermission(AccessJSONAPI, parent):
    raise Unauthorized(...)

The check is present on create and absent on update, update_many, remove, doActionFor, doActionFor_many, and getusers. The underlying @@API view is registered by plone.jsonapi.core at browser/configure.zcml:8-13 with permission="zope2.View", which is granted to Anonymous on the Plone Site root.

When an obj_uid is supplied, the route resolves the target through uid_catalog and brain.getObject(). The catalog brain walks the parent path with unrestrictedTraverse and applies restrictedTraverse only on the final segment, so the per-object View permission is enforced on the target. The chain is reachable to anonymous because bika_setup is anonymous-readable on a stock Plone Site (the View permission is acquired from the Plone Site root, which grants View to Anonymous by default).

2. eval() on RecordsField / RecordField values inside set_fields_from_request (CWE-95). Once an object has been resolved, set_fields_from_request in jsonapi/__init__.py:199-252 iterates the request fields. For any field of type RecordsField or RecordField, the helper runs eval(value) on the raw request string at line 240, before the field mutator and its write_permission check execute:

elif fieldtype in ['senaite.core.browser.fields.records.RecordsField',
                   'senaite.core.browser.fields.record.RecordField']:
    try:
        value = eval(value)
    except Exception:
        logger.warning(
            "JSONAPI: " + fieldname + ": Invalid "
            "JSON/Python variable")
        return []

The eval runs in the Zope worker process with full Python builtins available, so a payload such as __import__('os').popen('id').read() executes arbitrary system commands. The transaction savepoint inside update.py rolls back ZODB writes when the mutator subsequently fails, but Python side effects (subprocess, urllib calls, file I/O outside ZODB) have already happened and are not reverted.

The same eval() pattern is also present in the field setters at record.py:253-262 and records.py:135-143.

Anonymous UID discovery. The bika_setup object exposes two…

Summary

An unauthenticated remote code execution vulnerability in the SENAITE JSON API allows any network-reachable attacker to execute arbitrary Python on the Zope worker process via a two-request anonymous chain. The /@@API/update route is reachable to anonymous callers and runs eval() on attacker-controlled input before any permission check fires.

This is a different code path from the eval() in the calculations module: no authenticated account of any kind is required.

Details

The vulnerability is the chain of two independent flaws. Either fix alone breaks the unauthenticated chain, but the eval sink remains exploitable by any authenticated user with write access to a RecordsField, so both fixes are needed.

1. Missing AccessJSONAPI gate on JSON API write routes (CWE-862). The route at src/bika/lims/jsonapi/update.py:45-165 does not enforce the senaite.core: Access JSON API permission upfront. Compare with the sibling create.py:179-182, which does:

if not getSecurityManager().checkPermission(AccessJSONAPI, parent):
    raise Unauthorized(...)

The check is present on create and absent on update, update_many, remove, doActionFor, doActionFor_many, and getusers. The underlying @@API view is registered by plone.jsonapi.core at browser/configure.zcml:8-13 with permission="zope2.View", which is granted to Anonymous on the Plone Site root.

When an obj_uid is supplied, the route resolves the target through uid_catalog and brain.getObject(). The catalog brain walks the parent path with unrestrictedTraverse and applies restrictedTraverse only on the final segment, so the per-object View permission is enforced on the target. The chain is reachable to anonymous because bika_setup is anonymous-readable on a stock Plone Site (the View permission is acquired from the Plone Site root, which grants View to Anonymous by default).

2. eval() on RecordsField / RecordField values inside set_fields_from_request (CWE-95). Once an object has been resolved, set_fields_from_request in jsonapi/__init__.py:199-252 iterates the request fields. For any field of type RecordsField or RecordField, the helper runs eval(value) on the raw request string at line 240, before the field mutator and its write_permission check execute:

elif fieldtype in ['senaite.core.browser.fields.records.RecordsField',
                   'senaite.core.browser.fields.record.RecordField']:
    try:
        value = eval(value)
    except Exception:
        logger.warning(
            "JSONAPI: " + fieldname + ": Invalid "
            "JSON/Python variable")
        return []

The eval runs in the Zope worker process with full Python builtins available, so a payload such as __import__('os').popen('id').read() executes arbitrary system commands. The transaction savepoint inside update.py rolls back ZODB writes when the mutator subsequently fails, but Python side effects (subprocess, urllib calls, file I/O outside ZODB) have already happened and are not reverted.

The same eval() pattern is also present in the field setters at record.py:253-262 and records.py:135-143.

Anonymous UID discovery. The bika_setup object exposes two…