How severe is CVE-2020-5409?

CVE-2020-5409 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2020-5409 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (56th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-5409?

CVE-2020-5409 affects Pivotal Software Concourse. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-5409?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2020-5409 published?

CVE-2020-5409 was published on 2020-05-14 and last updated on 2026-06-17.

CVE-2020-5409

CVE-2020-5409 is a medium-severity vulnerability in Pivotal Software Concourse with a CVSS 3.x base score of 6.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-601.

Key facts

Severity: Medium (CVSS 3.x base score 6.1)
CVSS v2: 5.8
EPSS exploit prediction: 1% (56th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-601
Affected product: Pivotal Software Concourse
Published: 2020-05-14
Last modified: 2026-06-17

Description

Pivotal Concourse, most versions prior to 6.0.0, allows redirects to untrusted websites in its login flow. 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. (This issue is similar to, but distinct from, CVE-2018-15798.)

Frequently asked questions

What is CVE-2020-5409?: Pivotal Concourse, most versions prior to 6.0.0, allows redirects to untrusted websites in its login flow. 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. (This issue is similar to, but distinct from, CVE-2018-15798.)
How severe is CVE-2020-5409?: CVE-2020-5409 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2020-5409 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (56th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-5409?: CVE-2020-5409 affects Pivotal Software Concourse. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-5409?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2020-5409 published?: CVE-2020-5409 was published on 2020-05-14 and last updated on 2026-06-17.

References

https://tanzu.vmware.com/security/cve-2020-5409

Affected products (1)

cpe:2.3:a:pivotal_software:concourse:*:*:*:*:*:*:*:*

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