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CVE Record

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

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.

HighCVSS 7.6Not KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

CVE-2018-15798 is a login redirect flaw in Pivotal Concourse Release 4.x before 4.2.2. An attacker could trick a user into following a crafted OAuth redirect link to an untrusted website, potentially exposing that user’s Concourse access token.

Executive priority

Treat as high priority where legacy Concourse 4.x remains in use. The main business risk is account token exposure through user deception, which can undermine CI/CD control and trust.

Technical view

The issue affects the Concourse login flow and allows redirects to untrusted websites. It is remotely reachable without attacker authentication, but requires user interaction. The CVSS v3.0 score is 7.6 high, with low attack complexity and potential confidentiality, integrity, and availability impact.

Likely exposure

Exposure is limited to Pivotal Concourse Release 4.x deployments running versions before 4.2.2. Systems with reachable Concourse login flows and users susceptible to malicious login links are the most relevant concern.

Exploitation context

The source bundle does not indicate CISA KEV listing or confirmed active exploitation. The described attack depends on convincing a user to click a malicious OAuth redirect link; no exploit details are provided here.

Researcher notes

Evidence supports an OAuth login redirect weakness leading to potential access-token exposure. The bundle names affected versions and a fixed boundary, but does not provide CWE mapping, exploit telemetry, or detailed vendor remediation text.

Mitigation direction

  • Upgrade affected Concourse 4.x deployments to 4.2.2 or later.
  • Review the vendor advisory before production remediation.
  • Identify users who may have clicked suspicious Concourse login links.
  • Follow vendor guidance for any token invalidation or recovery actions.

Validation and detection

  • Inventory Concourse versions and flag 4.x releases before 4.2.2.
  • Confirm login endpoints are not running affected versions.
  • Review logs for unusual login redirect activity where available.
  • Check vendor guidance for any recommended post-remediation verification.
Prepared
Confidence
high
Sources
3

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.

description · low confidence lookup

Credential and access behavior lookup

The CVE wording references authentication or credential exposure, so valid-account and credential-access review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.

Open ATT&CK lookup
cve · low confidence lookup

CVE-2018-15798 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

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Vulnerability profileCVE Program record
Severity
High
CVSS
7.6 (3.0)
Known Exploited
No
Published

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

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

1CVSS vectors
0Timeline events
0ADP providers
2Source links

CVSS vector scores

1 official score

We collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.

ScoreVersionSeverityVectorExploitImpactSource
7.6CVSS 3.0HighCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:H2.84.7Primary CVE score

Vulnerability scoring details

Base CVSS 3.0 score

7.6High
CVSS 3.0 vector shape for CVE-2018-15798Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

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

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
PivotalConcourse4.xListed
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.