CVE-2021-41826: PlaceOS Authentication Service before 1.29.10.0 allows app/controllers/auth/sessions_controller.rb open redire

Q: How do I fix CVE-2021-41826?

placeos authentication: upgrade to 1.29.10.0. Exact commands for each OS are on this page.

Q: Is CVE-2021-41826 being exploited?

CVE-2021-41826 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2021-41826 affect?

CVE-2021-41826 affects placeos authentication. Severity is medium (CVSS 6.1). PlaceOS Authentication Service before 1.29.10.0 allows app/controllers/auth/sessions_controller.rb open redirect.

Q: How urgent is CVE-2021-41826?

Priority 50/100. EPSS top 4%: very likely to be exploited; Public exploit reference

This week

MEDIUM 6.1UPGRADE

CVE-2021-41826 is a medium-severity flaw (CVSS 6.1) affecting placeos authentication. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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

Why this priority

EPSS top 4%: very likely to be exploited
Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	6.1 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	12.1% (top 4%)
CISA exploited list	No
Weakness	CWE-601
Published	2021-09-30
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: place

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2021-09-30 00:15 UTCPublished CVE record published
2026-06-17 04:08 UTCUpdated Record last modified

place placeos authentication UPGRADE

Affected: < 1.29.10.0

Fixed in: 1.29.10.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy placeos-authentication || rpm -q placeos-authentication || placeos-authentication --version

2. UPGRADE to 1.29.10.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade placeos-authentication

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade placeos-authentication

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Nuclei scan template: PlaceOS 1.2109.1 - Open Redirection

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2021-41826?

placeos authentication: upgrade to 1.29.10.0. Exact commands for each OS are on this page.

Is CVE-2021-41826 being exploited?

CVE-2021-41826 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2021-41826 affect?

CVE-2021-41826 affects placeos authentication. Severity is medium (CVSS 6.1). PlaceOS Authentication Service before 1.29.10.0 allows app/controllers/auth/sessions_controller.rb open redirect.

How urgent is CVE-2021-41826?

Priority 50/100. EPSS top 4%: very likely to be exploited; Public exploit reference

References

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