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Vulnerabilities

Vulnerability · CVE-2021-41826

place placeos_authentication URL Redirection to Untrusted Site ('Open Redirect')

Published Sep 30, 2021 · catalog updated Oct 9, 2026 · placeos authentication

Patch now

CVE-2021-41826 is in the CISA known-exploited catalog. Confirm placeos authentication against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Gaps on this record

  • EPSS is missing. A missing score is not a low risk.
Severity
Medium6.1
Known exploitation
CISA KEV and VulnCheck KEV
EPSS
Not in the current FIRST EPSS dataset
Remediation
Remediation guidance
Affected products
cpe place/placeos authentication · vendor place placeos_authentication

PlaceOS Authentication Service before 1.29.10.0 allows app/controllers/auth/sessions_controller.rb open redirect.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe place/placeos authentication< 1.29.10.0
  • vendor place placeos_authenticationversion unspecified

How to fix CVE-2021-41826

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

CVE-2021-41826 is in the CISA known-exploited catalog. Confirm placeos authentication against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Which versions are affected?

Compare what you have installed with place/placeos authentication < 1.29.10.0. Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.

What should an analyst verify?

CWE-601: URL Redirection to Untrusted Site (Open Redirect). EPSS is absent from the current FIRST dataset. The CISA KEV listing is the exploitation evidence. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Oct 9, 2026 · VulnCheck KEV

    Detected

    PlaceOS Authentication Service before 1.29.10.0 allows app/controllers/auth/sessions_controller.rb open redirect.

  2. Oct 9, 2026 · CISA KEV

    Known exploited

    Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.

Sources

  • CVE.orgVulnerability recordCVE-2021-41826

    Official CVE identifier

    cve.org
  • NIST NVDVulnerability recordCVE-2021-41826

    PlaceOS Authentication Service before 1.29.10.0 allows app/controllers/auth/sessions_controller.rb open redirect.

    nvd.nist.gov
  • Packet Storm SecurityCited referencehttp://packetstormsecurity.com/files/164345/PlaceOS-1.2109.1-Open-Redirection.html

    Packet Storm link already published on the finding.

    packetstormsecurity.com
  • VulnCheck KEVConfirmed exploitationCVE-2021-41826

    PlaceOS Authentication Service before 1.29.10.0 allows app/controllers/auth/sessions_controller.rb open redirect.

    vulncheck.com

References

Freshness

Last verified in this catalog Oct 23, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.