CVE-2026-21767: HCL BigFix Platform is affected by insufficient authentication. The application might allow users to access s

Routine

MEDIUM 4.0UPGRADE

CVE-2026-21767 is a medium-severity flaw (CVSS 4.0) affecting bigfix platform. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

HCL BigFix Platform is affected by insufficient authentication. The application might allow users to access sensitive areas of the application without proper authentication.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	4.0 (Medium)
Attack vector	Local
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.1% (top 99%)
CISA exploited list	No
Weakness	CWE-306
Published	2026-04-02
Last modified	2026-10-26

Publisher (CNA): HCL Software · Vendor: hcltech

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-02 00:16 UTCPublished CVE record published
2026-10-26 21:10 UTCUpdated Record last modified

hcltech bigfix platform UPGRADE

Affected: >= 11.0.0 and <= 11.0.5

Fixed in: newer than 11.0.5

Safe to downgrade to: a release before 11.0.0

1. Check installed version

apt-cache policy bigfix-platform || rpm -q bigfix-platform || bigfix-platform --version

2. UPGRADE to newer than 11.0.5 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade bigfix-platform

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade bigfix-platform

Note

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

3. If no update is available yet, DOWNGRADE to a release before 11.0.0 (Debian / Ubuntu)

apt-cache madison bigfix-platform sudo apt install bigfix-platform=<VERSION_BEFORE_11.0.0> sudo apt-mark hold bigfix-platform

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list bigfix-platform sudo dnf downgrade bigfix-platform-<VERSION_BEFORE_11.0.0> sudo dnf versionlock add bigfix-platform

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

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-2026-21767?

bigfix platform: upgrade to newer than 11.0.5. Exact commands for each OS are on this page.

Is CVE-2026-21767 being exploited?

CVE-2026-21767 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-2026-21767 affect?

CVE-2026-21767 affects bigfix platform. Severity is medium (CVSS 4.0). HCL BigFix Platform is affected by insufficient authentication. The application might allow users to access sensitive areas of the application without proper authentication.

How urgent is CVE-2026-21767?

Priority 14/100. No elevated risk signals yet.

Related CVEs

CVE-2026-21765 HIGH 8.8 UPGRADE HCL BigFix Platform is affected by insecure permissions on private cryptographic keys. The private cryptograp

References

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