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VulnerabilityPublished

CVE-2026-53577: kestra · Incorrect Authorization

Affects kestraSource CVE Database V5

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Not known to be exploited · CVSS 6.5 Medium : upgrade to 1.3.21 or 1.0.45 when convenient.

Data as of 7 Nov 2026, 23:24 UTC

CVSS 3.1 base score
6.5Medium
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.4% chance of exploitation in 30 days – higher than 38% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in 1.3.21, 1.0.45
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 26 Jun 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 8 Nov 2026.

What to do

Upgrade kestra and kestra-io/kestra to 1.3.21 or 1.0.45.

Affected software

ProductAffectedFixed in
kestra-iokestraAffected
  • >=1.1.0 <1.3.21
Fixed in
  • 1.3.21
kestra-iokestraAffected
  • <1.0.45
Fixed in
  • 1.0.45
GitHubkestra-io/kestrapkg:github/kestra-io/kestraOther threatsAffected
  • <1.0.45
  • <1.3.21
Fixed in
  • 1.0.45
  • 1.3.21

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

Upgrade Kestra to version 1.0.45 or later, or 1.3.21 or later, where this access control bypass vulnerability is fixed. No other mitigations are indicated by the vendor advisory. Patch status is confirmed by the fixed versions stated in the description.

Description

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.

References

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