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NVD / CVE Program· CNA pivotal

CVE-2020-5415: Concourse's GitLab auth allows impersonation

Noroxi assessment

Priority: Plan (action score 40/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 1.2% (FIRST EPSS); higher than 68.8% of all records.
  • Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: github.com/concourse/concourse (Go) 1.6.1-0.20200730151558-b00d1c8d8576, 6.3.1, 6.4.1; github.com/concourse/dex (Go) 6.3.1, 6.4.1, 0.0.0-20200730150203-821b48abfd88.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Add it to your regular patch cycle. Upgrade to github.com/concourse/concourse (Go) 1.6.1-0.20200730151558-b00d1c8d8576, 6.3.1, 6.4.1; github.com/concourse/dex (Go) 6.3.1, 6.4.1, 0.0.0-20200730150203-821b48abfd88 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

Concourse, versions prior to 6.3.1 and 6.4.1, in installations which use the GitLab auth connector, is vulnerable to identity spoofing by way of configuring a GitLab account with the same full name as another user who is granted access to a Concourse team. GitLab groups do not have this vulnerability, so GitLab users may be moved into groups which are then configured in the Concourse team.

CriticalCVSS 10.0 · v3.1—No exploit Fix available
Published
Aug 12, 2020
Updated
Jun 16, 2026
EPSS
1.2% · 68th percentile

Report tools

JSON

Action score

40

Plan

Add it to your regular patch cycle.

CVSS
40 / 40 · 10.0 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 1.2%

CNA vs NVD score

NVD
10.0
CNA · pivotal
10.0
agree

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:L

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

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When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
pivotal softwareconcourse

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • pivotal software concoursebefore 6.3.1
  • pivotal software concourse6.4.0 and later · before 6.4.1

Versions reported by the vendor

Affected version ranges reported by the assigning authority (pivotal). Independent of NVD's CPE analysis and usually ahead of it.

  • VMware Tanzu Concourse

    • 6.4 and later · before 6.4.1affected
    • 6.3 and later · before 6.3.1affected

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Gogithub.com/concourse/concoursefrom 0.0.0 · before 1.6.1-0.20200730151558-b00d1c8d85761.6.1-0.20200730151558-b00d1c8d8576
Gogithub.com/concourse/concoursefrom 1.6.1 · before 6.3.16.3.1
Gogithub.com/concourse/concoursefrom 6.4.0 · before 6.4.16.4.1
Gogithub.com/concourse/concoursebefore 0.0.0-20200730151558-b00d1c8d85760.0.0-20200730151558-b00d1c8d8576
Gogithub.com/concourse/dexfrom 0.0.0 · before 6.3.16.3.1
Gogithub.com/concourse/dexfrom 6.4.0 · before 6.4.16.4.1
Gogithub.com/concourse/dexbefore 0.0.0-20200730150203-821b48abfd880.0.0-20200730150203-821b48abfd88

Same product

pivotal software: all records

Other highest-scoring records for the same primary product.

  • CVE-2019-3792Concourse 5.0.0 SQL Injection vulnerability
    30Monitor
  • CVE-2019-3803Concourse includes token in CLI authentication callback
    30Monitor
  • CVE-2018-1227Pivotal Concourse after 2018-03-05 might allow remote attackers to have an unspecified impact, if a customer obtained the Concourse software
    30Monitor

Published before and after this one in the same product

  • ← EarlierCVE-2018-15798Dec 19, 2018 · Pivotal Concourse allows malicious redirect urls on login
    21Monitor
  • ← EarlierCVE-2020-5409May 13, 2020 · Concourse Open Redirect in the /sky/login endpoint
    24Monitor
  • Later →CVE-2022-31683Dec 19, 2022 · Concourse (7.x.y prior to 7.8.3 and 6.x.y prior to 6.7.9) contains an authorization bypass issue.
    21Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Go:github.com/concourse/concourse0.0.0-20200730151558-b00d1c8d8576Package registry (OSV)
Go:github.com/concourse/concourse1.6.1-0.20200730151558-b00d1c8d8576Package registry (OSV)
Go:github.com/concourse/concourse6.3.1Package registry (OSV)
Go:github.com/concourse/concourse6.4.1Package registry (OSV)
Go:github.com/concourse/dex0.0.0-20200730150203-821b48abfd88Package registry (OSV)
Go:github.com/concourse/dex6.3.1Package registry (OSV)
Go:github.com/concourse/dex6.4.1Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

No history yet (it accumulates with the daily EPSS job).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

All national notices →

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
high · data or configuration can be modified
Availability
none

Impact can extend beyond the vulnerable component (scope changes).

Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Changed
Confidentiality impact
High
Integrity impact
High
Availability impact
None

Weakness class (CWE)

CWE-290 · Authentication Bypass by Spoofing

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (1 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records