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CVE-2026-87858— Temporal Server completion callback source header can direct attacker-chosen requests to the internal frontend with administrator authorization

一分钟漏洞结论

影响对象
Temporal Technologies, Inc. Temporal Server
利用判断
尚无明确在野利用证据，仍需结合暴露面评估
建议动作
优先检查厂商安全公告和参考链接中的修复版本；无法立即升级时，限制受影响服务暴露并加强监测。

Temporal Server decided whether a Workflow completion callback was internal by reading a caller-supplied HTTP header. An authenticated caller holding only write permission in a single namespace could attach a completion callback whose URL host matched the conf

CVSS 7.2 · High EPSS 0.43% · P37

影响版本矩阵 3

厂商产品 版本范围状态
Temporal Technologies, Inc. Temporal Server 1.30.0< 1.30.7 affected
1.31.0< 1.31.3 affected
1.25.0≤ 1.29.7 affected
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一、 漏洞 CVE-2026-87858 基础信息

漏洞信息

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Vulnerability Title
Temporal Server completion callback source header can direct attacker-chosen requests to the internal frontend with administrator authorization
来源: CVE Program / CVE List V5
Vulnerability Description
Temporal Server decided whether a Workflow completion callback was internal by reading a caller-supplied HTTP header. An authenticated caller holding only write permission in a single namespace could attach a completion callback whose URL host matched the configured callback address allowlist, whose URL path was any Temporal HTTP API route, and whose header map contained a non-empty header named source. When the History service delivered that callback, the non-empty source header caused it to re-target the request at the local frontend client and rewrite only the scheme and host, preserving the caller's path, query, and request body. Where an internal frontend is deployed with its HTTP API enabled, that client resolves to the internal frontend, which authorizes every request as a system administrator without requiring authentication information. The result is that the server performs an attacker-chosen state-changing HTTP POST against its own administrative API on the caller's behalf, in namespaces where the caller has no permission. The caller never needs network access to the internal frontend, because the History service makes the request. Confirmed effects include terminating Workflows in other namespaces, registering namespaces, modifying another namespace's configuration, and deleting another namespace and its Workflows. The affected routing logic is present in both the HSM and CHASM callback delivery implementations. This description and the CVSS score in this record describe releases 1.30.0 and later, where any non-empty source header is sufficient. Releases 1.25.0 through 1.29.7 are affected by a narrower form of the same defect in which the header must exactly match a configured cluster ID, a UUID that a namespace-scoped caller cannot read through the API. The consequence once that match occurs is the same, but the attack is materially harder and scores lower. To determine whether a deployment is affected, check two settings together: the static Server configuration for a non-zero services.internal-frontend.rpc.httpPort, and the effective per-namespace dynamic configuration value of component.callbacks.allowedAddresses. A deployment is exposed only when an internal frontend is deployed with a non-zero HTTP port, at least one allowlist rule admits a host, and authorization is enabled. The allowlist is empty by default, which denies all external callback URLs, and the stock static topology does not include an internal frontend. Note that a failed attach returns the error 'invalid url: url does not match any configured callback address', which proves only that one tested URL did not match and does not prove the effective allowlist is empty. To look for callbacks already attached, use DescribeWorkflowExecution, which returns callback information for a Workflow's registered completion callbacks. Operators should be aware of a gap when searching for evidence of delivery: the frontend HTTP API server records the request method and URL at debug level only, so at default log levels a delivered request is not written to the internal frontend's logs, and the absence of such log entries is not evidence that the issue was not exploited.
来源: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N
来源: CVE Program / CVE List V5
Vulnerability Type
在安全决策中依赖未经信任的输入
来源: CVE Program / CVE List V5

受影响产品

厂商 产品 影响版本 CPE 订阅
Temporal Technologies, Inc. Temporal Server 1.30.0 ~ 1.30.7 cpe:2.3:a:temporal:temporal:*:*:*:*:*:*:*:*
Temporal Technologies, Inc. Temporal Server 1.25.0 ~ 1.29.7 cpe:2.3:a:temporal:temporal:*:*:*:*:*:*:*:*

二、漏洞 CVE-2026-87858 的公开POC

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三、漏洞 CVE-2026-87858 的情报信息

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CVE-2026-87858 补丁与修复 (3)

CVE-2026-87858 其他参考 (3)

同批安全公告 · Temporal Technologies, Inc. · 2026-09-21 · 共 8 条

CVE-2026-89139 8.7 HIGH Temporal Server worker deployment compute provider executes a caller-supplied command on t
CVE-2026-65653 8.7 HIGH temporalio/tchannel-go zero-chunk call fragment causes process termination
CVE-2026-65654 8.7 HIGH temporalio/ringpop-go fails to enforce configured label limits on inbound membership gossi
CVE-2026-65652 8.7 HIGH temporalio/tchannel-go malformed checksum type causes process termination
CVE-2026-16652 7.1 HIGH Temporal Server Schedule exclusion search can cause excessive CPU consumption
CVE-2026-16651 7.1 HIGH temporalio/sqlparser malformed MySQL version comments can cause a panic
CVE-2026-65651 6.0 MEDIUM temporalio/sqlparser deeply nested unary expressions can cause a fatal stack overflow duri

IV. Related Vulnerabilities

Same product: Temporal Server
Same vendor: Temporal Technologies, Inc.
Same weakness: CWE-807

V. Comments for CVE-2026-87858

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