CVE-2026-33638: Ech0 is an open-source, self-hosted publishing platform for personal idea sharing

Q: How do I fix CVE-2026-33638?

ech0: upgrade to 4.2.0. Exact commands for each OS are on this page.

Q: Is CVE-2026-33638 being exploited?

CVE-2026-33638 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-2026-33638 affect?

CVE-2026-33638 affects ech0. Severity is medium (CVSS 5.3). Ech0 is an open-source, self-hosted publishing platform for personal idea sharing. Prior to version 4.2.0, `GET /api/allusers` is mounted as a public endpoint and returns user records without authentication. This allows remote unauthenticat

Q: How urgent is CVE-2026-33638?

Priority 34/100. Remotely exploitable, no login, no user action

Routine

MEDIUM 5.3REMOTEUPGRADE

CVE-2026-33638 is a medium-severity flaw (CVSS 5.3) affecting ech0. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Ech0 is an open-source, self-hosted publishing platform for personal idea sharing. Prior to version 4.2.0, `GET /api/allusers` is mounted as a public endpoint and returns user records without authentication. This allows remote unauthenticated user enumeration and exposure of user profile metadata. A fix is available in v4.2.0.

Why this priority

Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	5.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.5% (top 57%)
CISA exploited list	No
Weakness	CWE-862
Published	2026-03-26
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: ech0

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

Am I affected?

Timeline

2026-03-26 21:17 UTCPublished CVE record published
2026-06-17 10:37 UTCUpdated Record last modified

ech0 ech0 UPGRADE

Affected: < 4.2.0

Fixed in: 4.2.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy ech0 || rpm -q ech0 || ech0 --version

2. UPGRADE to 4.2.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade ech0

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade ech0

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-2026-33638?

ech0: upgrade to 4.2.0. Exact commands for each OS are on this page.

Is CVE-2026-33638 being exploited?

CVE-2026-33638 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-2026-33638 affect?

CVE-2026-33638 affects ech0. Severity is medium (CVSS 5.3). Ech0 is an open-source, self-hosted publishing platform for personal idea sharing. Prior to version 4.2.0, `GET /api/allusers` is mounted as a public endpoint and returns user records without authentication. This allows remote unauthenticat

How urgent is CVE-2026-33638?

Priority 34/100. Remotely exploitable, no login, no user action

Related CVEs

CVE-2026-35037 HIGH 7.2 UPGRADE Ech0 is an open-source, self-hosted publishing platform for personal idea sharing
CVE-2026-35036 HIGH 7.5 UPGRADE Ech0 is an open-source, self-hosted publishing platform for personal idea sharing

References

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