CVE-2018-1000809: privacyIDEA version 2.23.1 and earlier contains a Improper Input Validation vulnerability in token validation

Q: How do I fix CVE-2018-1000809?

privacyidea: upgrade to newer than 2.23.1. Exact commands for each OS are on this page.

Q: Is CVE-2018-1000809 being exploited?

CVE-2018-1000809 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-2018-1000809 affect?

CVE-2018-1000809 affects privacyidea. Severity is high (CVSS 7.5). privacyIDEA version 2.23.1 and earlier contains a Improper Input Validation vulnerability in token validation api that can result in Denial-of-Service. This attack appear to be exploitable via http request with user= &pass= to /valida

This week

HIGH 7.5REMOTEUPGRADE

CVE-2018-1000809 is a high-severity flaw (CVSS 7.5) affecting privacyidea. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

privacyIDEA version 2.23.1 and earlier contains a Improper Input Validation vulnerability in token validation api that can result in Denial-of-Service. This attack appear to be exploitable via http request with user=<space>&pass= to /validate/check url. This vulnerability appears to have been fixed in 2.23.2.

Why this priority

High severity
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.7% (top 23%)
CISA exploited list	No
Weakness	CWE-20
Published	2018-10-08
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: privacyidea

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

Am I affected?

Timeline

2018-10-08 15:29 UTCPublished CVE record published
2026-06-17 01:33 UTCUpdated Record last modified

privacyidea privacyidea UPGRADE

Affected: <= 2.23.1

Fixed in: newer than 2.23.1

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy privacyidea || rpm -q privacyidea || privacyidea --version

2. UPGRADE to newer than 2.23.1 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade privacyidea

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade privacyidea

Note

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

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-2018-1000809?

privacyidea: upgrade to newer than 2.23.1. Exact commands for each OS are on this page.

Is CVE-2018-1000809 being exploited?

CVE-2018-1000809 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-2018-1000809 affect?

CVE-2018-1000809 affects privacyidea. Severity is high (CVSS 7.5). privacyIDEA version 2.23.1 and earlier contains a Improper Input Validation vulnerability in token validation api that can result in Denial-of-Service. This attack appear to be exploitable via http request with user=<space>&pass= to /valida

How urgent is CVE-2018-1000809?

Priority 56/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

References

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