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Verified reproduction

CVE-2026-27191: Feathers OAuth Open Redirect Account Takeover

Download script Open in Codespaces

CVE-2026-27191 is verified against @feathersjs/authentication-oauth · npm affected versions: <= 5.0.39 fixed version: 5.0.40 vulnerability class: Open Redirect This high reproduction includes runnable sandbox proof, artifacts, and a plain-text agent view under REPRO-2026-00109.

REPRO-2026-00109 @feathersjs/authentication-oauth · npm Open Redirect Feb 20, 2026 CVE entry .txt
Severity HIGH
Confidence HIGH
Reproduced in 12m 54s
Tool calls 78
Spend $0.31
Affected <= 5.0.39
Fixed in 5.0.40
01 · Reproduce
Download script Open in Codespaces →
$ pruva-verify REPRO-2026-00109
or curl -O https://pruva.dev/api/v1/reproductions/REPRO-2026-00109/artifacts/reproduction_steps.sh && chmod +x reproduction_steps.sh && ./reproduction_steps.sh
Run in a VM or disposable container. This exploits a real vulnerability.
02 · The vulnerability

Open redirect in OAuth callback enables account takeover via URL authority injection

03 · Root cause 
Open redirect in OAuth callback enables account takeover via URL authority injection
04 · Reproduction transcript

The agent's step-by-step process — every tool call, every handoff, the moment the exploit fired. Phases: support triages the advisory · repro reproduces it · vuln_variant confirms the fix blocks it · judge verifies.

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05 · Artifacts

Scripts, logs, diffs, and output captured during the reproduction.

No artifacts available