CVE-2026-65655
Temporal UI Server may set OAuth credential cookies without Secure behind a TLS-terminating reverse proxy
Description
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.
INFO
Published Date :
Aug. 11, 2026, 8:18 p.m.
Last Modified :
Aug. 11, 2026, 8:18 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
Affected Products
The following products are affected by CVE-2026-65655
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
No affected product recoded yet
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 4.0 | LOW | 61241ed8-fa44-4f23-92db-b8c443751968 | ||||
| CVSS 4.0 | LOW | [email protected] |
Solution
- Configure TLS re-encryption between proxy and UI server.
- Enforce HTTPS-only connections for Temporal UI Server.
- Update Temporal UI Server to latest version.
- Review identity provider cookie security settings.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-65655.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-65655 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-65655
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-65655 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-65655 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
New CVE Received by [email protected]
Aug. 11, 2026
Action Type Old Value New Value Added Affected [{'repo': 'https://github.com/temporalio/ui-server', 'vendor': 'Temporal Technologies, Inc.', 'modules': ['OIDC authentication cookies'], 'product': 'Temporal UI Server', 'versions': [{'status': 'affected', 'version': '2.7.0', 'lessThan': '2.53.2', 'versionType': 'semver'}], 'packageName': 'github.com/temporalio/ui-server/v2', 'programFiles': ['server/auth/auth.go', 'server/route/auth.go'], 'collectionURL': 'https://pkg.go.dev', 'defaultStatus': 'unaffected'}] Added Description 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. Added CVSS V4.0 AV:N/AC:L/AT:P/PR:N/UI:P/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Added CWE CWE-614 Added Reference https://github.com/temporalio/ui-server/blob/v2.53.1/server/auth/auth.go#L87-L153 Added Reference https://github.com/temporalio/ui-server/blob/v2.53.1/server/route/auth.go#L281-L316 Added Reference https://github.com/temporalio/ui-server/commit/7b9ff533fb51beba75497c0a192c66775c08f279 Added Reference https://github.com/temporalio/ui-server/commit/821cf598371353f1b579dfe1e87aeb3638b041d6 Added Reference https://github.com/temporalio/ui-server/commit/8876b80b63003688ab736f45ef28885695a4f6db Added Reference https://github.com/temporalio/ui-server/releases/tag/v2.53.1 Added Reference https://github.com/temporalio/ui-server/releases/tag/v2.53.2 Added Reference https://github.com/temporalio/ui/pull/3806