CVE-2026-53577: Kestra is an open-source, event-driven orchestration platform

Routine

MEDIUM 6.5UPGRADE

CVE-2026-53577 is a medium-severity flaw (CVSS 6.5) affecting kestra. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Kestra is an open-source, event-driven orchestration platform. Prior to 1.0.45 and 1.3.21, the previewFileFromExecution endpoint (GET /api/v1/{tenant}/executions/{executionId}/file/preview) contains an access control bypass that allows any authenticated user to read output files from any other execution within the same tenant, bypassing execution-level and namespace-level isolation. This vulnerability is fixed in 1.0.45 and 1.3.21.

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.4% (top 62%)
CISA exploited list	No
Weakness	CWE-863
Published	2026-06-26
Last modified	2026-10-25

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

Last updated 2026-10-25 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-06-26 22:16 UTCPublished CVE record published
2026-10-25 17:10 UTCUpdated Record last modified

kestra kestra UPGRADE

Affected: < 1.0.45 · >= 1.1.0 and < 1.3.21

Fixed in: 1.0.45, 1.3.21

Safe to downgrade to: a release before 1.1.0

1. Check installed version

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

2. UPGRADE to 1.0.45 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade kestra

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 1.1.0 (Debian / Ubuntu)

apt-cache madison kestra sudo apt install kestra=<VERSION_BEFORE_1.1.0> sudo apt-mark hold kestra

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

dnf --showduplicates list kestra sudo dnf downgrade kestra-<VERSION_BEFORE_1.1.0> sudo dnf versionlock add kestra

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-2026-53577?

kestra: upgrade to 1.0.45, 1.3.21. Exact commands for each OS are on this page.

Is CVE-2026-53577 being exploited?

CVE-2026-53577 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-2026-53577 affect?

CVE-2026-53577 affects kestra. Severity is medium (CVSS 6.5). Kestra is an open-source, event-driven orchestration platform. Prior to 1.0.45 and 1.3.21, the previewFileFromExecution endpoint (GET /api/v1/{tenant}/executions/{executionId}/file/preview) contains an access control bypass that allows any

How urgent is CVE-2026-53577?

Priority 37/100. Public exploit reference

Related CVEs

CVE-2026-49869 CRITICAL 10.0 EXPLOITED UPGRADE Kestra OSS OS Command Injection Vulnerability
CVE-2026-53576 CRITICAL 10.0 UPGRADE Kestra is an open-source, event-driven orchestration platform
CVE-2026-45807 HIGH 7.7 UPGRADE Kestra is an open-source, event-driven orchestration platform
CVE-2026-55069 HIGH 8.7 UPGRADE Kestra is an open-source, event-driven orchestration platform

References

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