Kubetail: Cross-Site WebSocket Hijacking allows attacker to read Kubernetes logs from authenticated users

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No collected risk observation for these identifiers. This does not establish absence of exploitation or a zero probability.

Kubetail is a real-time logging dashboard for Kubernetes. Prior to 0.14.0, Kubetail's dashboard exposes WebSocket endpoints that did not adequately validate the Origin header on connection upgrade. A malicious web page visited by a user with an active Kubetail session could open a WebSocket to the user's dashboard and read their Kubernetes logs in real time. This is a Cross-Site WebSocket Hijacking (CSWSH) vulnerability and affects both the desktop deployment (default http://localhost:7500) and cluster deployments (typically behind an Ingress with HTTP basic auth). This vulnerability is fixed in 0.14.0.

Source published

14 May 2026 16:20:11 UTC

Source modified

16 May 2026 00:39:44 UTC

Observed here

23 Oct 2026 15:48:27 UTC

Source terms

CVE Program Terms of Use

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CVSS 3.1 · 6.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

Kubetail is a real-time logging dashboard for Kubernetes. Prior to 0.14.0, Kubetail's dashboard exposes WebSocket endpoints that did not adequately validate the Origin header on connection upgrade. A malicious web page visited by a user with an active Kubetail session could open a WebSocket to the user's dashboard and read their Kubernetes logs in real time. This is a Cross-Site WebSocket Hijacking (CSWSH) vulnerability and affects both the desktop deployment (default http://localhost:7500) and cluster deployments (typically behind an Ingress with HTTP basic auth). This vulnerability is fixed in 0.14.0.

Source published

May 14, 2026, 4:20:11 PM (timezone not stated)

Source modified

May 16, 2026, 12:39:44 AM (timezone not stated)

Observed here

28 Oct 2026 06:08:12 UTC

Source terms

ENISA EUVD · source terms and attribution apply

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EUVD CVSS 3.1 · 6.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

Kubetail is a real-time logging dashboard for Kubernetes. Prior to 0.14.0, Kubetail's dashboard exposes WebSocket endpoints that did not adequately validate the Origin header on connection upgrade. A malicious web page visited by a user with an active Kubetail session could open a WebSocket to the user's dashboard and read their Kubernetes logs in real time. This is a Cross-Site WebSocket Hijacking (CSWSH) vulnerability and affects both the desktop deployment (default http://localhost:7500) and cluster deployments (typically behind an Ingress with HTTP basic auth). This vulnerability is fixed in 0.14.0.

Source published

14 May 2026 17:16:23 UTC

Source modified

26 Oct 2026 14:10:00 UTC

Observed here

27 Oct 2026 11:12:17 UTC

Source terms

NIST NVD usage terms; underlying source attribution retained

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This view projects the publisher's source fields for reading; the original JSON retains additional fields and CVE enrichment containers. Attribution: nvd · NIST NVD usage terms; underlying source attribution retained. Source text is retained; field grouping and change labels are provided by ChangeIntel.

CVSS 3.1 · [email protected] · Secondary · 6.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

### Summary Kubetail's dashboard exposes WebSocket endpoints that did not adequately validate the Origin header on connection upgrade. A malicious web page visited by a user with an active Kubetail session could open a WebSocket to the user's dashboard and read their Kubernetes logs in real time. This is a Cross-Site WebSocket Hijacking (CSWSH) vulnerability and affects both the desktop deployment (default http://localhost:7500) and cluster deployments (typically behind an Ingress with HTTP basic auth). ### Impact An attacker who can convince an authenticated Kubetail user to visit a page they control can: - Establish a WebSocket connection to the victim's dashboard from the attacker's origin - Stream container logs the victim has access to via the Kubernetes API - Exfiltrate the contents to an attacker-controlled server The attacker gains **read-only** access to logs — no write or destructive operations are exposed. However, container logs frequently contain credentials accidentally written by application code, bearer tokens, internal hostnames, customer PII, and other secrets, so the practical impact of read access can be significant. The desktop deployment is particularly exposed because the dashboard is reachable at a predictable localhost URL, requires no network reachability from the attacker, and the browser will attach ambient credentials to the WebSocket handshake. For cluster deployments fronted by HTTP basic auth, the browser's automatic re-sending of basic-auth credentials on the WebSocket upgrade request enables the same attack against the configured dashboard origin. ### Affected versions | Component | Name | Affected | Patched | | --------------------------------- | ---------------------- | -------- | ---------- | | Kubetail Dashboard docker image | `kubetail-dashboard` | < 0.14.0 | >= 0.14.0 | | Kubetail Helm Chart | `kubetail/kubetail` | < 0.23.0 | >= 0.23.0 | | Kubetail CLI | `kubetail` | < 0.16.0 | >= 0.16.0 | Confirmed in Google Chrome. Microsoft Edge is presumed affected as it shares Chromium's WebSocket implementation, but was not directly tested. **Preconditions for exploitation** 1. The victim has an active authenticated Kubetail session (desktop dashboard running, or browser holding valid credentials for a cluster deployment). 2. The victim visits a web page controlled by the attacker in the same browser. 3. The attacker knows or can guess the dashboard URL (trivial for desktop; cluster deployments require knowing the Ingress hostname). ### Patches Upgrade to: * Kubetail Dashboard 0.14.0 or later * Kubetail Helm Chart 0.23.0 or later * Kubetail CLI 0.16.0 or later ### Workarounds If users cannot upgrade immediately: * **Desktop:** Stop the dashboard (kubetail CLI process) when not actively in use. Avoid visiting untrusted sites in the same browser profile while the dashboard is running. * **Cluster:** Restrict Ingress access to a VPN, bastion, or office network. Add a stronger outer authentication layer (e.g. OAuth proxy) in front of basic auth. Consider browser profile isolation for cluster admins.

Source published

7 May 2026 02:34:32 UTC

Source modified

25 Jun 2026 23:11:37 UTC

Observed here

24 Oct 2026 13:19:41 UTC

Source terms

GitHub Advisory Database · CC-BY-4.0

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CVSS_V3 · CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

Publisher rating · MODERATE

Kubetail has a Cross-Site WebSocket Hijacking issue that allows attacker to read Kubernetes logs from authenticated users in github.com/kubetail-org/kubetail/modules/cli. NOTE: The source advisory for this report contains additional versions that could not be automatically mapped to standard Go module versions. (If this is causing false-positive reports from vulnerability scanners, please suggest an edit to the report.) The additional affected modules and versions are: github.com/kubetail-org/kubetail/modules/cli before v0.16.0; github.com/kubetail-org/kubetail/modules/dashboard before v0.14.0.

Source published

25 Jun 2026 22:34:38 UTC

Source modified

25 Jun 2026 23:01:37 UTC

Observed here

24 Oct 2026 13:19:41 UTC

Source terms

OSV · upstream source license applies

Original source record · Cite this exact observation · Complete original publisher JSON

This view projects the publisher's source fields for reading; the original JSON retains additional fields and CVE enrichment containers. Attribution: osv · OSV · upstream source license applies. Source text is retained; field grouping and change labels are provided by ChangeIntel.