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Medium, CVSS 5.4

Pivotal Concourse Open Redirect in Login Flow

CVE-2018-15798GHSA-9689-rx4v-cqgc

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (github.com/concourse/concourse 5.8.1, 5.5.10, 5.2.8), redeploy, then verify what is actually installed.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS
5.4 · CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
EPSS
  • CVE-2018-15798: 1.15% estimated exploitation activity in the next 30 days; percentile 66.78 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.
Source description

As published by the source; long descriptions are shortened.

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. Specific Go Packages Affected github.com/concourse/concourse/skymarshal/skyserver

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 1 · created ·

    Published from ghsa record GHSA-9689-rx4v-cqgc

Agent brief

Preview the exact text before you copy it. Commands are read-only suggestions; review them before running anything.

# Patch Next advisory brief: CVE-2018-15798

Advisory: Pivotal Concourse Open Redirect in Login Flow
IDs: CVE-2018-15798, GHSA-9689-rx4v-cqgc
Record: https://patchnext.com/advisories/cve-2018-15798 (revision 1, source checked 26 Oct 2026, 14:59 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 5.4)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: github.com/concourse/concourse 5.8.1, 5.5.10, 5.2.8. A vendor fix does not mean a deployment is fixed.

## Affected components
- Go github.com/concourse/concourse: affected < 5.2.8; >= 5.3.0, < 5.5.10; >= 5.6.0, < 5.8.1; fixed in 5.5.10, 5.2.8, 5.8.1

## Suggested inspection (read-only)
- Go github.com/concourse/concourse: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on github.com/concourse/concourse.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-9689-rx4v-cqgc (GitHub-reviewed advisory GHSA-9689-rx4v-cqgc lists affected ranges: Go github.com/concourse/concourse >=0 =5.3.0 =5.6.0 <5.8.1)

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