Temporal Proxy up to 0.8.0 Encryption pkg/crypto/vault.go improper authorization

Summaryinfo

A vulnerability labeled as problematic has been found in Temporal Proxy up to 0.8.0. The affected element is an unknown function of the file pkg/crypto/vault.go of the component Encryption. The manipulation results in improper authorization. This vulnerability is reported as CVE-2026-108126. The attack can be launched remotely. No exploit exists. The affected component should be upgraded.

Detailsinfo

A vulnerability classified as problematic has been found in Temporal Proxy up to 0.8.0. Affected is an unknown part of the file pkg/crypto/vault.go of the component Encryption. The manipulation with an unknown input leads to a improper authorization vulnerability. CWE is classifying the issue as CWE-285. The product does not perform or incorrectly performs an authorization check when an actor attempts to access a resource or perform an action. This is going to have an impact on confidentiality. CVE summarizes:

temporal-proxy 0.2.0 through 0.8.0 does not bind encrypted payloads to the namespace they were encrypted for. When payload encryption is enabled, the proxy chooses the decryption key by an identifier stored in the payload rather than by the namespace of the request, and nothing in the ciphertext records that namespace. A caller whom the proxy authorizes only for namespace B, and who has obtained an encrypted payload from namespace A, can therefore have the proxy decrypt it. In 0.8.0, the caller can submit the payload to the codec server's /decode endpoint. In every affected version, a caller who can also write to namespace B on the Temporal server directly can place the payload there and read it back through the proxy. This holds whether namespaces share the default key or each has its own, because a single proxy holds every key it is configured with. The issue does not give the attacker encrypted payloads they could not already obtain, and does not allow encrypted payloads to be modified.

The advisory is available at github.com. This vulnerability is traded as CVE-2026-108126 since 10/09/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1548.002 by the MITRE ATT&CK project.

Upgrading to version 0.9.0 eliminates this vulnerability.

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Productinfo

Type

• Firewall Software

Vendor

• Temporal

Name

• Proxy

Version

• 0.1
• 0.2
• 0.3
• 0.4
• 0.5
• 0.6
• 0.7
• 0.8.0

CPE 2.3info

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CPE 2.2info

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