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[GH-ISSUE #20791] issue: "Failed to execute 'getImageData' on 'CanvasRenderingContext2D': The canvas has been tainted by cross-origin data." #34818

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opened 2026-04-25 09:00:05 -05:00 by GiteaMirror · 3 comments
GiteaMirror commented 2026-04-25 09:00:05 -05:00
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Originally created by @sokai on GitHub (Jan 19, 2026).
Original GitHub issue: https://github.com/open-webui/open-webui/issues/20791

Check Existing Issues

  • I have searched for any existing and/or related issues.
  • I have searched for any existing and/or related discussions.
  • I have also searched in the CLOSED issues AND CLOSED discussions and found no related items (your issue might already be addressed on the development branch!).
  • I am using the latest version of Open WebUI.

Installation Method

Docker

Open WebUI Version

v0.7.2 (latest)

Ollama Version (if applicable)

0.13.5

Operating System

TrueNAS CE v25.10.1

Browser (if applicable)

Chromium v143.0.7499.192

Confirmation

  • I have read and followed all instructions in README.md.
  • I am using the latest version of both Open WebUI and Ollama.
  • I have included the browser console logs.
  • I have included the Docker container logs.
  • I have provided every relevant configuration, setting, and environment variable used in my setup.
  • I have clearly listed every relevant configuration, custom setting, environment variable, and command-line option that influences my setup (such as Docker Compose overrides, .env values, browser settings, authentication configurations, etc).
  • I have documented step-by-step reproduction instructions that are precise, sequential, and leave nothing to interpretation. My steps:
  • Start with the initial platform/version/OS and dependencies used,
  • Specify exact install/launch/configure commands,
  • List URLs visited, user input (incl. example values/emails/passwords if needed),
  • Describe all options and toggles enabled or changed,
  • Include any files or environmental changes,
  • Identify the expected and actual result at each stage,
  • Ensure any reasonably skilled user can follow and hit the same issue.

Expected Behavior

  1. As a administrator (within the web UI): If I create a new user with "Admin Panel > +" (/admin/users/overview), the (new) user should become created after click on [Save] (in the modal)
  2. As a administrator (within the web UI): If I click on "Settings > Account", the account settings should open
  3. With enable_signup": true a new account should become created after cklick on [Create Account] on the "Sign up to Open WebUI" (start) page (/auth → "Sign up" link)

Actual Behavior

  1. The (new user) is not created and the [Save] button spinner spins endless
  2. The Account settings aren't opend and the whole settings modal becomes unresponsible (I have to reload the page)
  3. The account is not created (and I stay on the "Sign up" page)

And for all 3 points I get this SecurityError in the console:

error-handling.js:68 Uncaught SecurityError: Failed to execute 'getImageData' on 'CanvasRenderingContext2D': The canvas has been tainted by cross-origin data.
    at Jm (index.ts:252:16)
    at Ig (index.ts:341:7)
    at UserProfileImage.svelte:92:53
    at UserProfileImage.svelte:92:10

Steps to Reproduce

See all 3 points at "Expected Behavior"

Logs & Screenshots

See "Actual Behavior"

In the (browser) console also is a link Show ignore-listed frames. If I click on it the error message becomes exanded:

error-handling.js:68 Uncaught SecurityError: Failed to execute 'getImageData' on 'CanvasRenderingContext2D': The canvas has been tainted by cross-origin data.
    at Jm (index.ts:252:16)
    at Ig (index.ts:341:7)
    at UserProfileImage.svelte:92:53
    at Ae (runtime.js:747:10)
    at UserProfileImage.svelte:92:10
    at vr (runtime.js:297:16)
    at an (deriveds.js:342:12)
    at Kn (deriveds.js:356:14)
    at _e (runtime.js:684:4)
    at Array.map (<anonymous>)

Additional Information

No response

Originally created by @sokai on GitHub (Jan 19, 2026). Original GitHub issue: https://github.com/open-webui/open-webui/issues/20791 ### Check Existing Issues - [x] I have searched for any existing and/or related issues. - [x] I have searched for any existing and/or related discussions. - [x] I have also searched in the CLOSED issues AND CLOSED discussions and found no related items (your issue might already be addressed on the development branch!). - [x] I am using the latest version of Open WebUI. ### Installation Method Docker ### Open WebUI Version v0.7.2 (latest) ### Ollama Version (if applicable) 0.13.5 ### Operating System TrueNAS CE v25.10.1 ### Browser (if applicable) Chromium v143.0.7499.192 ### Confirmation - [x] I have read and followed all instructions in `README.md`. - [x] I am using the latest version of **both** Open WebUI and Ollama. - [x] I have included the browser console logs. - [x] I have included the Docker container logs. - [x] I have **provided every relevant configuration, setting, and environment variable used in my setup.** - [x] I have clearly **listed every relevant configuration, custom setting, environment variable, and command-line option that influences my setup** (such as Docker Compose overrides, .env values, browser settings, authentication configurations, etc). - [x] I have documented **step-by-step reproduction instructions that are precise, sequential, and leave nothing to interpretation**. My steps: - Start with the initial platform/version/OS and dependencies used, - Specify exact install/launch/configure commands, - List URLs visited, user input (incl. example values/emails/passwords if needed), - Describe all options and toggles enabled or changed, - Include any files or environmental changes, - Identify the expected and actual result at each stage, - Ensure any reasonably skilled user can follow and hit the same issue. ### Expected Behavior 1. As a administrator (within the web UI): If I create a new user with "Admin Panel > +" (`/admin/users/overview`), the (new) user should become created after click on [Save] (in the modal) 2. As a administrator (within the web UI): If I click on "Settings > Account", the account settings should open 3. With `enable_signup": true` a new account should become created after cklick on [Create Account] on the "Sign up to Open WebUI" (start) page (`/auth` → "Sign up" link) ### Actual Behavior 1. The (new user) is not created and the [Save] button spinner spins _endless_ 2. The Account settings aren't opend and the whole settings modal becomes _unresponsible_ (I have to reload the page) 3. The account is not created (and I stay on the "Sign up" page) And for all 3 points I get this `SecurityError` in the console: ```js error-handling.js:68 Uncaught SecurityError: Failed to execute 'getImageData' on 'CanvasRenderingContext2D': The canvas has been tainted by cross-origin data. at Jm (index.ts:252:16) at Ig (index.ts:341:7) at UserProfileImage.svelte:92:53 at UserProfileImage.svelte:92:10 ``` ### Steps to Reproduce See all 3 points at "Expected Behavior" ### Logs & Screenshots See "Actual Behavior" In the (browser) console also is _a link_ `Show ignore-listed frames`. If I click on it the error message becomes _exanded_: ```js error-handling.js:68 Uncaught SecurityError: Failed to execute 'getImageData' on 'CanvasRenderingContext2D': The canvas has been tainted by cross-origin data. at Jm (index.ts:252:16) at Ig (index.ts:341:7) at UserProfileImage.svelte:92:53 at Ae (runtime.js:747:10) at UserProfileImage.svelte:92:10 at vr (runtime.js:297:16) at an (deriveds.js:342:12) at Kn (deriveds.js:356:14) at _e (runtime.js:684:4) at Array.map (<anonymous>) ``` ### Additional Information _No response_
GiteaMirror added the bug label 2026-04-25 09:00:05 -05:00
GiteaMirror commented 2026-04-25 09:00:07 -05:00
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@owui-terminator[bot] commented on GitHub (Jan 19, 2026):

🔍 Similar Issues Found

I found some existing issues that might be related to this one. Please check if any of these are duplicates or contain helpful solutions:

  1. #20237 issue: Image editing stopped working
    by tomasloksa • Dec 29, 2025 • bug, confirmed issue

  2. #20119 issue: Unable to export images from conversations containing imagery to external sources (e.g., another Open WebUI instance)
    by CookSleep • Dec 22, 2025 • bug

  3. #19411 issue: 0.6.37 cuda images didn't succeed
    by GlisseManTV • Nov 24, 2025 • bug

💡 Tips:

  • If this is a duplicate, please consider closing this issue and adding any additional details to the existing one
  • If you found a solution in any of these issues, please share it here to help others

This comment was generated automatically by a bot. Please react with a 👍 if this comment was helpful, or a 👎 if it was not.

<!-- gh-comment-id:3768253901 --> @owui-terminator[bot] commented on GitHub (Jan 19, 2026): 🔍 **Similar Issues Found** I found some existing issues that might be related to this one. Please check if any of these are duplicates or contain helpful solutions: 1. [#20237](https://github.com/open-webui/open-webui/issues/20237) **issue: Image editing stopped working** *by tomasloksa • Dec 29, 2025 • `bug`, `confirmed issue`* 2. [#20119](https://github.com/open-webui/open-webui/issues/20119) **issue: Unable to export images from conversations containing imagery to external sources (e.g., another Open WebUI instance)** *by CookSleep • Dec 22, 2025 • `bug`* 3. [#19411](https://github.com/open-webui/open-webui/issues/19411) **issue: 0.6.37 cuda images didn't succeed** *by GlisseManTV • Nov 24, 2025 • `bug`* --- 💡 **Tips:** - If this is a duplicate, please consider closing this issue and adding any additional details to the existing one - If you found a solution in any of these issues, please share it here to help others *This comment was generated automatically by a bot.* Please react with a 👍 if this comment was helpful, or a 👎 if it was not.
GiteaMirror commented 2026-04-25 09:00:08 -05:00
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@tjbck commented on GitHub (Jan 20, 2026):

Could you share a bit more about your setup? We're unable to reproduce.

<!-- gh-comment-id:3773255598 --> @tjbck commented on GitHub (Jan 20, 2026): Could you share a bit more about your setup? We're unable to reproduce.
GiteaMirror commented 2026-04-25 09:00:09 -05:00
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@sokai commented on GitHub (Jan 20, 2026):

Thanks @tjbck for your feedback!

As I reported, I've installed the current Open WebUI version v0.7.2 as a TrueNAS App (which is a Docker installation).
I haven't experienced any other issues: I can download and use LLM models – everything seems to work fine/as expected.

But: While writing this I tried (again) to create a new user (with the "Admin Panel"), this time while using Librewolf v146.0.1-1 (instead of Chromium), and I succeeded …! 🤨
FYI: I use the CanvasBlocker extension and got a pop-up message which led me to https://support.mozilla.org/en-US/kb/firefox-protection-against-fingerprinting.

After that I tried this (create new user in "Admin Panel") at Chromium v144.0.7559.59 (again) and can/have to reverify the issue/error. ☹️
So maybe this is a Ungoogled Chromium issue/bug, regarding the fingerprinting protection ? 🤔
→ Should I close this issue (, or do you wanna investigate it further)?

KR

<!-- gh-comment-id:3774757012 --> @sokai commented on GitHub (Jan 20, 2026): Thanks @tjbck for your feedback! As I reported, I've installed the current Open WebUI version `v0.7.2` as a TrueNAS _App_ (which is a Docker installation). I haven't experienced any other _issues_: I can download and use LLM models – everything _seems_ to work _fine/as expected_. **But**: While writing this I tried (again) to create a new user (with the "Admin Panel"), this time while using Librewolf `v146.0.1-1` (instead of Chromium), and I **succeeded** …! 🤨 FYI: I use the [CanvasBlocker](https://github.com/kkapsner/CanvasBlocker) extension and got a pop-up message which led me to https://support.mozilla.org/en-US/kb/firefox-protection-against-fingerprinting. After that I tried this (create new user in "Admin Panel") at Chromium `v144.0.7559.59` (again) and can/have to reverify the _issue/error_. ☹️ So maybe this is a Ungoogled Chromium _issue/bug_, regarding the _fingerprinting protection_ ? 🤔 → Should I close this issue (, or do you wanna _investigate_ it further)? KR
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Reference: github-starred/open-webui#34818
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