fix(webhooks): Prevent SSRF in webhooks and webhook tests

[matthewelwell]

Changes

This PR addresses 2 things:

1. Validate URLs when creating or testing webhooks to validate for SSRF attacks.
2. Previously the response from the API returned the raw python exception to the client on a failed webhook test. This exposed unnecessary detail to the client.

Note: I think there are FE improvements that can be made here, but it opens a bit of a can of worms regarding standardising error messages and FE rendering of them.

How did you test this code?

1. Manually ran a test against a URL that failed and verified that the returned information was as expected.
2. Added and updated existing unit tests to verify the SSRF validation behaviour, and error responses

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3 Skipped Deployments

Project	Deployment	Actions	Updated (UTC)
docs	Ignored	Preview	May 21, 2026 2:37pm
flagsmith-frontend-preview	Ignored	Preview	May 21, 2026 2:37pm
flagsmith-frontend-staging	Ignored	Preview	May 21, 2026 2:37pm

[github-actions]

Docker builds report

Image	Build Status	Security report
ghcr.io/flagsmith/flagsmith-e2e:pr-7550	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-api-test:pr-7550	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-frontend:pr-7550	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-api:pr-7550	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith:pr-7550	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-private-cloud:pr-7550	Finished ✅	Results ✅

[github-actions]

Playwright Test Results (oss - depot-ubuntu-latest-16)

 1 passed

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 c77dde9
 🔄 Run: #16854 (attempt 1)

Playwright Test Results (oss - depot-ubuntu-latest-arm-16)

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 1 test across 1 suite
 36.5 seconds
 c77dde9
 🔄 Run: #16854 (attempt 1)

Playwright Test Results (private-cloud - depot-ubuntu-latest-16)

 3 passed

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 3 tests across 3 suites
 51.8 seconds
 c77dde9
 🔄 Run: #16854 (attempt 1)

Playwright Test Results (private-cloud - depot-ubuntu-latest-arm-16)

 3 passed

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 3 tests across 3 suites
 41.6 seconds
 c77dde9
 🔄 Run: #16854 (attempt 1)

Playwright Test Results (oss - depot-ubuntu-latest-16)

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 fa80188
 🔄 Run: #16855 (attempt 1)

Playwright Test Results (oss - depot-ubuntu-latest-arm-16)

 1 passed

Details

 1 test across 1 suite
 38.8 seconds
 fa80188
 🔄 Run: #16855 (attempt 1)

Playwright Test Results (private-cloud - depot-ubuntu-latest-arm-16)

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 fa80188
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Playwright Test Results (private-cloud - depot-ubuntu-latest-16)

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 fa80188
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Playwright Test Results (oss - depot-ubuntu-latest-16)

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 1 test across 1 suite
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 0a05e84
 🔄 Run: #16862 (attempt 1)

Playwright Test Results (private-cloud - depot-ubuntu-latest-arm-16)

 19 passed

Details

 19 tests across 15 suites
 1 minute, 9 seconds
 0a05e84
 🔄 Run: #16862 (attempt 1)

Playwright Test Results (oss - depot-ubuntu-latest-arm-16)

 1 passed

Details

 1 test across 1 suite
 39.5 seconds
 0a05e84
 🔄 Run: #16862 (attempt 1)

Playwright Test Results (private-cloud - depot-ubuntu-latest-16)

 3 passed

Details

 3 tests across 3 suites
 50.1 seconds
 0a05e84
 🔄 Run: #16862 (attempt 1)

Playwright Test Results (oss - depot-ubuntu-latest-arm-16)

 1 passed

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 1 test across 1 suite
 43 seconds
 d31d339
 🔄 Run: #16868 (attempt 1)

Playwright Test Results (oss - depot-ubuntu-latest-16)

 1 passed

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 1 test across 1 suite
 35.5 seconds
 d31d339
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Playwright Test Results (private-cloud - depot-ubuntu-latest-arm-16)

 2 passed

Details

 2 tests across 2 suites
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 d31d339
 🔄 Run: #16868 (attempt 1)

Playwright Test Results (private-cloud - depot-ubuntu-latest-16)

 1 passed

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 1 test across 1 suite
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 d31d339
 🔄 Run: #16868 (attempt 1)

Playwright Test Results (oss - depot-ubuntu-latest-16)

 1 passed

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 1 test across 1 suite
 38 seconds
 36a5868
 🔄 Run: #16869 (attempt 1)

Playwright Test Results (oss - depot-ubuntu-latest-arm-16)

 1 passed

Details

 1 test across 1 suite
 41.5 seconds
 36a5868
 🔄 Run: #16869 (attempt 1)

Playwright Test Results (private-cloud - depot-ubuntu-latest-arm-16)

 19 passed

Details

 19 tests across 15 suites
 1 minute, 10 seconds
 36a5868
 🔄 Run: #16869 (attempt 1)

Playwright Test Results (private-cloud - depot-ubuntu-latest-16)

 3 passed

Details

 3 tests across 3 suites
 53.9 seconds
 36a5868
 🔄 Run: #16869 (attempt 1)

Playwright Test Results (oss - depot-ubuntu-latest-arm-16)

 1 passed

Details

 1 test across 1 suite
 44 seconds
 626db5c
 🔄 Run: #16893 (attempt 1)

Playwright Test Results (private-cloud - depot-ubuntu-latest-16)

 2 passed

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 2 tests across 2 suites
 36.2 seconds
 626db5c
 🔄 Run: #16893 (attempt 1)

Playwright Test Results (private-cloud - depot-ubuntu-latest-arm-16)

 1 failed

Details

 1 test across 1 suite
 22.8 seconds
 626db5c
 📦 Artifacts: View test results and HTML report
🔄 Run: #16893 (attempt 1)

Failed tests

firefox › tests/project-permission-test.pw.ts › Project Permission Tests › Project-level permissions control access to features, environments, audit logs, and segments @enterprise

### Playwright Test Results (private-cloud - depot-ubuntu-latest-arm-16)

 2 passed

Details

 2 tests across 2 suites
 39.5 seconds
 626db5c
 🔄 Run: #16893 (attempt 2)

[github-actions]

Visual Regression

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.49%. Comparing base (24f4d1a) to head (626db5c).
⚠️ Report is 16 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7550      +/-   ##
==========================================
+ Coverage   98.47%   98.49%   +0.01%     
==========================================
  Files        1400     1417      +17     
  Lines       53034    53671     +637     
==========================================
+ Hits        52224    52861     +637     
  Misses        810      810              

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