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CVE Record

CVE-2019-11881: A vulnerability exists in Rancher before 2.2.4 in the login component, where the errorMsg parameter can be...

A vulnerability exists in Rancher before 2.2.4 in the login component, where the errorMsg parameter can be tampered to display arbitrary content, filtering tags but not special characters or symbols. There's no other limitation of the message, allowing malicious users to lure legitimate users to visit phishing sites with scare tactics, e.g., displaying a "This version of Rancher is outdated, please visit https://malicious.rancher.site/upgrading" message.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

Rancher versions before 2.2.4 could show attacker-controlled text on the login page through an error message parameter. This does not show evidence of code execution, but it can make a trusted Rancher login page display convincing phishing or scare-message content.

Executive priority

Prioritize remediation where Rancher is internet-facing or used by privileged administrators. The main business risk is credential theft through trusted-page phishing, not documented server takeover.

Technical view

The login component accepted tampered errorMsg content and filtered tags, but not special characters or symbols. The result was arbitrary message display in Rancher before 2.2.4, enabling social-engineering content in a legitimate interface.

Likely exposure

Exposure is most likely on Rancher deployments older than 2.2.4 where the login flow is reachable by users or externally accessible.

Exploitation context

The source bundle includes public GitHub references, but does not show CISA KEV listing or confirmed active exploitation. Treat this as phishing-enablement rather than proven system compromise.

Researcher notes

Evidence supports arbitrary content display via errorMsg in Rancher before 2.2.4. CVSS and CWE data are absent in the bundle, and active exploitation is not established. Avoid overstating impact beyond phishing and UI message manipulation.

Mitigation direction

  • Upgrade Rancher to version 2.2.4 or later.
  • Review Rancher vendor guidance and release notes for this CVE.
  • Limit external access to Rancher login interfaces where operationally possible.
  • Warn administrators not to trust upgrade links shown only in login errors.

Validation and detection

  • Inventory Rancher versions and identify deployments earlier than 2.2.4.
  • Confirm login and SAML error flows are not internet-exposed unnecessarily.
  • Review access logs for unusual crafted login error URLs.
  • Check user reports for suspicious Rancher upgrade or warning messages.
Prepared
Confidence
medium
Sources
6

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

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CVE-2019-11881 mapping review

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
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.

0CVSS vectors
0Timeline events
0ADP providers
5Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
n/an/an/aListed
Weakness

CWE details

No CWE listed

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