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CVE-2026-89140— Temporal Server internal completion callbacks are not bound to their namespace, allowing cross-namespace changes to Scheduler V2 schedule state

Quick assessment

Affected
Temporal Technologies, Inc. Temporal Server
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Temporal 服务器未将内部完成回调绑定到注册它们的命名空间，这导致拥有某个命名空间写权限的已认证调用者可以更改另一命名空间中的 Scheduler V2 调度状态。 地址 是保留地址，专用于 Scheduler V2 在启动工作流（Workflow）时附加的回调。在受影响的版本中，任何已认证调用者均可将具有该地址的回调附加到工作流启动请求中；该地址被从 允许列表中排除，并且历史服务（History service）会将回调直接投递给令牌所指代的组件，无论该组件位于哪个命名空间，且在此过程中未对原始调用者进行授

CVSS 6.0 · Medium EPSS 0.33% · P24

Affected Version Matrix 3

VendorProduct Version RangeStatus
Temporal Technologies, Inc. Temporal Server 1.30.0< 1.30.8 affected
1.31.0< 1.31.4 affected
1.32.0< 1.32.1 affected
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I. Basic Information for CVE-2026-89140

Vulnerability Information
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Vulnerability Title
Temporal Server internal completion callbacks are not bound to their namespace, allowing cross-namespace changes to Scheduler V2 schedule state
Source: CVE Program / CVE List V5
Vulnerability Description
Temporal Server does not bind internal completion callbacks to the namespace that attached them, which allows an authenticated caller with write permission in one namespace to alter Scheduler V2 schedule state in another namespace. The callback address temporal://internal is reserved for callbacks that Scheduler V2 attaches to the Workflows it starts. In affected releases, any authenticated caller could attach a callback with that address to a Workflow start request, the address was exempt from the component.callbacks.allowedAddresses allowlist, and the History service delivered the callback to the component its token named, in whatever namespace that was, without authorizing the original caller there. When the forged completion matches an action a target schedule is running, the schedule records the action as completed while its Workflow still runs, which can defeat an overlap policy such as SKIP, and passes caller-controlled data to the next scheduled Workflow as its last completion result. A forged failure may also pause a schedule configured to pause on failure. A forgery requires the target namespace identifier, the schedule identifier, and the identity and timing of a running action. No disclosure of Workflow payloads or history was identified. Only namespaces that hold Scheduler V2 schedules can be targeted; Scheduler V2 is off by default, and existing Scheduler V2 schedules remain targets after the settings that create them are turned off.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
通过用户控制密钥绕过授权机制
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Temporal Technologies, Inc. Temporal Server 1.30.0 ~ 1.30.8 cpe:2.3:a:temporal:temporal:*:*:*:*:*:*:*:*
Temporal Technologies, Inc. Temporal Server 1.31.0 ~ 1.31.4 cpe:2.3:a:temporal:temporal:*:*:*:*:*:*:*:*
Temporal Technologies, Inc. Temporal Server 1.32.0 ~ 1.32.1 cpe:2.3:a:temporal:temporal:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-89140

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III. Intelligence Information for CVE-2026-89140

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Patches & Fixes for CVE-2026-89140 (8)

Vendor Pages for CVE-2026-89140 (1)

Other References for CVE-2026-89140 (1)

IV. Related Vulnerabilities

Same product: Temporal Server
Same vendor: Temporal Technologies, Inc.
Same weakness: CWE-639

V. Comments for CVE-2026-89140

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