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    2 vulnerabilities found for Temporal UI Server by Temporal Technologies, Inc.

    CVE-2026-65655 (GCVE-0-2026-65655)

    Vulnerability from nvd – Published: 2026-08-11 19:29 – Updated: 2026-08-11 20:15
    VLAI
    Title
    Temporal UI Server may set OAuth credential cookies without Secure behind a TLS-terminating reverse proxy
    Summary
    When OAuth authentication is enabled and browser-facing TLS terminates at a reverse proxy that forwards the callback to Temporal UI Server over HTTP, affected versions derive authentication-cookie Secure attributes from the proxy-to-server connection. Temporal UI Server can therefore issue access-token cookies, and refresh-token cookies when provided by the identity provider, without Secure even though the browser completed login over HTTPS. A victim who visits attacker-controlled content while a credential remains live may expose that credential only if the attacker can also steer traffic for the UI hostname, prevent the browser's HTTPS connection from succeeding, serve the hostname over HTTP, and read a later same-site plaintext request. A malicious website alone cannot read the cookie, and passive observation of a successful TLS connection is insufficient. Effective HSTS, a blocking HTTPS-only warning, or TLS re-encryption between the proxy and Temporal UI Server prevents the demonstrated disclosure path. A recovered credential may be replayed within the victim's assigned permissions. Refresh-token replay additionally depends on the identity provider's issuance, expiry, rotation, and reuse-detection behavior.
    Severity
    2.3 (Low)
    CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N
    SSVC
    Exploitation: none Automatable: no Technical Impact: partial
    CISA Coordinator · CISA-ADP (v2.0.3)
    Decision recorded 2026-08-11 20:15 UTC
    CWE
    • CWE-614 - Sensitive Cookie in HTTPS Session Without 'Secure' Attribute
    Assigner
    References
    Impacted products
    Vendor Product Version
    Temporal Technologies, Inc. Temporal UI Server Affected: 2.7.0 , < 2.53.2 (semver)
    		Create a notification for this product.
    Credits
    An external security researcher who reported this issue responsibly to Temporal Technologies
    Show details on NVD website
    To clipboard 

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            }
          ],
          "value": "When OAuth authentication is enabled and browser-facing TLS terminates at a reverse proxy that forwards the callback to Temporal UI Server over HTTP, affected versions derive authentication-cookie Secure attributes from the proxy-to-server connection. Temporal UI Server can therefore issue access-token cookies, and refresh-token cookies when provided by the identity provider, without Secure even though the browser completed login over HTTPS.\n\n\n\nA victim who visits attacker-controlled content while a credential remains live may expose that credential only if the attacker can also steer traffic for the UI hostname, prevent the browser\u0027s HTTPS connection from succeeding, serve the hostname over HTTP, and read a later same-site plaintext request. A malicious website alone cannot read the cookie, and passive observation of a successful TLS connection is insufficient. Effective HSTS, a blocking HTTPS-only warning, or TLS re-encryption between the proxy and Temporal UI Server prevents the demonstrated disclosure path.\n\n\n\nA recovered credential may be replayed within the victim\u0027s assigned permissions. Refresh-token replay additionally depends on the identity provider\u0027s issuance, expiry, rotation, and reuse-detection behavior."
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        },
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    "dateUpdated": "2026-08-11T20:15:56.858Z",
    "state": "PUBLISHED"
  },
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  "dataVersion": "5.2"
}

    CVE-2026-65655 (GCVE-0-2026-65655)

    Vulnerability from cvelistv5 – Published: 2026-08-11 19:29 – Updated: 2026-08-11 20:15
    VLAI
    Title
    Temporal UI Server may set OAuth credential cookies without Secure behind a TLS-terminating reverse proxy
    Summary
    When OAuth authentication is enabled and browser-facing TLS terminates at a reverse proxy that forwards the callback to Temporal UI Server over HTTP, affected versions derive authentication-cookie Secure attributes from the proxy-to-server connection. Temporal UI Server can therefore issue access-token cookies, and refresh-token cookies when provided by the identity provider, without Secure even though the browser completed login over HTTPS. A victim who visits attacker-controlled content while a credential remains live may expose that credential only if the attacker can also steer traffic for the UI hostname, prevent the browser's HTTPS connection from succeeding, serve the hostname over HTTP, and read a later same-site plaintext request. A malicious website alone cannot read the cookie, and passive observation of a successful TLS connection is insufficient. Effective HSTS, a blocking HTTPS-only warning, or TLS re-encryption between the proxy and Temporal UI Server prevents the demonstrated disclosure path. A recovered credential may be replayed within the victim's assigned permissions. Refresh-token replay additionally depends on the identity provider's issuance, expiry, rotation, and reuse-detection behavior.
    Severity
    2.3 (Low)
    CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N
    SSVC
    Exploitation: none Automatable: no Technical Impact: partial
    CISA Coordinator · CISA-ADP (v2.0.3)
    Decision recorded 2026-08-11 20:15 UTC
    CWE
    • CWE-614 - Sensitive Cookie in HTTPS Session Without 'Secure' Attribute
    Assigner
    References
    Impacted products
    Vendor Product Version
    Temporal Technologies, Inc. Temporal UI Server Affected: 2.7.0 , < 2.53.2 (semver)
    		Create a notification for this product.
    Credits
    An external security researcher who reported this issue responsibly to Temporal Technologies
    Show details on NVD website
    To clipboard 

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          "tags": [
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          "url": "https://github.com/temporalio/ui-server/commit/8876b80b63003688ab736f45ef28885695a4f6db"
        },
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          "name": "First fixed release",
          "tags": [
            "release-notes"
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          "url": "https://github.com/temporalio/ui-server/releases/tag/v2.53.2"
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          "lang": "en",
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            {
              "base64": false,
              "type": "text/html",
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            }
          ],
          "value": "Upgrade to Temporal UI Server v2.53.2 or later. The fix derives the authentication-cookie Secure attribute from the configured browser-facing OAuth callback URL instead of the proxy-to-server connection and applies that decision consistently to all authentication cookies."
        }
      ],
      "source": {
        "discovery": "EXTERNAL"
      },
      "title": "Temporal UI Server may set OAuth credential cookies without Secure behind a TLS-terminating reverse proxy",
      "workarounds": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "\u003cp\u003eConfigure TLS between the reverse proxy and Temporal UI Server, enforce HSTS for the public UI hostname, and block plaintext HTTP. These controls prevent the demonstrated disclosure path but do not correct the configuration-dependent cookie attribute.\u003c/p\u003e"
            }
          ],
          "value": "Configure TLS between the reverse proxy and Temporal UI Server, enforce HSTS for the public UI hostname, and block plaintext HTTP. These controls prevent the demonstrated disclosure path but do not correct the configuration-dependent cookie attribute."
        }
      ]
    }
  },
  "cveMetadata": {
    "assignerOrgId": "61241ed8-fa44-4f23-92db-b8c443751968",
    "assignerShortName": "Temporal",
    "cveId": "CVE-2026-65655",
    "datePublished": "2026-08-11T19:29:39.620Z",
    "dateReserved": "2026-07-22T18:08:48.925Z",
    "dateUpdated": "2026-08-11T20:15:56.858Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}