CASCACascade Atlas

Evidence dossier

CVE-2026-49869

Kestra: Unauthenticated Remote Code Execution via Authentication Bypass in `AuthenticationFilter`

Exploited in the wild (CISA KEV since Sep 2, 2026). GitHub_M reports CVSS 3.1 10.0. EPSS estimates 2.1% exploit likelihood as of Oct 22, 2026.

67.9–73.2Priority evidence range
Evidence through Oct 22, 2026, 6:07 PM UTC

As of Oct 22, 2026

Normalized restatement

Kestra is an open-source, event-driven orchestration platform. Prior to 1.0.45 and 1.3.21, AuthenticationFilter in Kestra OSS uses request.getPath().endsWith("/configs") to whitelist the public configuration endpoint from Basic Auth. Because the check is a suffix match rather than an exact path match, any API path whose last segment is configs bypasses authentication entirely. An unauthenticated remote attacker can exploit this to create and execute arbitrary workflows without credentials. Because Kestra ships with script execution plugins (plugin-script-shell, plugin-script-python, etc.) enabled by default, this directly results in unauthenticated Remote Code Execution as root inside the Kestra worker container. This vulnerability is fixed in 1.0.45 and 1.3.21.

State
PUBLISHED
Published
Jun 26, 2026
Updated
Sep 3, 2026
Evidence coverage
85%

Evidence chronology

What was known when

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  1. Source dateFirst observed by CASCA
    CISA KEV

    Exploitation cataloged: Kestra OSS OS Command Injection Vulnerability

    Inspect raw assertion
    Field
    observed_exploitation
    Value
    Kestra OSS OS Command Injection Vulnerability
    Original evidence ↗
  2. Source dateSource date omittedFirst observed by CASCA
    CISA-ADP

    Record text: CISA ADP Vulnrichment

    Inspect raw assertion
    Field
    container
    Value
    CISA ADP Vulnrichment
    Original evidence ↗
  3. Source dateSource date omittedFirst observed by CASCA
    GitHub_M

    Record text: Kestra: Unauthenticated Remote Code Execution via Authentication Bypass in `AuthenticationFilter`

    Inspect raw assertion
    Field
    container
    Value
    Kestra: Unauthenticated Remote Code Execution via Authentication Bypass in `AuthenticationFilter`
    Original evidence ↗
  4. Source dateFirst observed by CASCA
    FIRST EPSS

    EPSS score: 2.1% probability · 81.51th percentile

    Inspect raw assertion
    Field
    model_probability
    Value
    Probability 0.020950000000; percentile 0.815110000000
    Original evidence ↗
ExploitationCatalog member

CISA KEV · catalog date Sep 2, 2026 · first observed Sep 2, 2026

Exploit likelihood2.10%

FIRST EPSS · score date Oct 22, 2026 · 81.5th percentile · first observed Oct 22, 2026

SeverityCVSS 10.0

GitHub_M · CVSS 3.1 · first observed Sep 3, 2026 · same-version scores align in this snapshot

Evidence detail

Source limits and decisions

Why each evidence state has this value

casca-unknown-reasons-v1
Exploitation statusLast verified source snapshot retained

The last verified source boundary remains in force for this claim.

Revision
evidence-policy-v1.1.0
Cutoff
Oct 22, 2026
Resolution
Review source contract
Exploit likelihoodEvidence supported

Eligible evidence is present for this bounded claim.

Revision
evidence-policy-v1.1.0
Cutoff
Oct 22, 2026
Resolution
None
Severity assessmentEvidence supported

Eligible evidence is present for this bounded claim.

Revision
casca-direct-cvss-eligibility-v1
Cutoff
Oct 22, 2026
Resolution
None
Affected productsSource-reported scope

The cited source assertion is retained while canonical product linkage remains open.

Revision
casca-factor-d-obligations-v1
Cutoff
Oct 22, 2026
Resolution
Resolve identity

Source comparison

Who said what

CISA KEVOriginal assertion
Exploitation cataloged

Kestra OSS OS Command Injection Vulnerability

Inspect raw assertion
Field
observed_exploitation
Value
Kestra OSS OS Command Injection Vulnerability
Source dateFirst observed by CASCAOriginal evidence ↗
CISA-ADPIndependent enrichment
Record text

CISA ADP Vulnrichment

Inspect raw assertion
Field
container
Value
CISA ADP Vulnrichment
Source dateSource date omittedFirst observed by CASCAOriginal evidence ↗
GitHub_MOriginal assertion
Record text

Kestra: Unauthenticated Remote Code Execution via Authentication Bypass in `AuthenticationFilter`

Inspect raw assertion
Field
container
Value
Kestra: Unauthenticated Remote Code Execution via Authentication Bypass in `AuthenticationFilter`
Source dateSource date omittedFirst observed by CASCAOriginal evidence ↗
FIRST EPSSOriginal assertion
EPSS score

2.1% probability · 81.51th percentile

Inspect raw assertion
Field
model_probability
Value
Probability 0.020950000000; percentile 0.815110000000
Source dateFirst observed by CASCAOriginal evidence ↗

Applicability

Cited product scope

Trace impact →
2Underlying assertions
1Canonical products
2Target assertions
0Constraint assertions

Grouped from 1 configuration nodes in this exact snapshot. Visual grouping is navigational; asset exposure and root cause require cited evidence.

Identity source boundaries
  • Cpe dictionary1,775,266 records · observed through 2026-07-21T06:45:29.809Z27d65b0f-b718-4b4f-bb79-c47c68d09dfa
  • Cpe match643,502 records · observed through 2026-07-21T08:13:17.697Z955dae73-7302-438b-aee1-058d7cc5d48e

2 scope groups

GitHub_M · source assertedkestra-iokestraDirect source scope
Affected: < 1.0.45Affected: >= 1.1.0, < 1.3.21
Source-reported scope

Canonical linkage remains open; the cited source assertion is retained below.

Inspect raw assertion[{"status": "affected", "version": "< 1.0.45"}, {"status": "affected", "version": ">= 1.1.0, < 1.3.21"}]
NVD CPE · APPLICATIONkestrakestraVulnerable target · 2 assertions
Any version (unconstrained) (< 1.0.45); Any version (unconstrained) (>= 1.1.0, < 1.3.21)Canonical identity product-ff9d36fb1d6890ee95adc95f276f3e2f0f50ffac46ac2f2f9651f930b4238d4dLinked exact
Scope supported
Inspect raw assertions
  1. cpe:2.3:a:kestra:kestra:*:*:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 1
    Logic
    OR
    Version bounds
    from including 1.1.0; through excluding 1.3.21
    Match ID
    73fd0092-9076-4f1c-9b93-e59c09d30e21
  2. cpe:2.3:a:kestra:kestra:*:*:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 0
    Logic
    OR
    Version bounds
    through excluding 1.0.45
    Match ID
    adc0ed79-69ef-4a2a-9f07-4791ed97124f

Affected-product evidence

Accepted scope and product mapping

0 canonical links · 2 source-reported links

Source-reported scopeSource-reported scope

Canonical linkage remains open; the cited source assertion is retained below.

Vendor specified only by source · Product specified only by source

Source class
Direct cve affected
Assertions
1
Mapping revision
cpe23-exact-mapping-v1
Observed cutoff
Oct 22, 2026
Retained assertion IDs
f2f3eca3-9b99-4f9b-9959-bfc94127ba17
Source-reported scopeSource-reported scope

Canonical linkage remains open; the cited source assertion is retained below.

Vendor specified only by source · Product specified only by source

Source class
Nvd cpe vulnerable target
Assertions
2
Mapping revision
cpe23-exact-mapping-v1
Observed cutoff
Oct 22, 2026
Retained assertion IDs
d195b923-2dda-43d4-bba3-e2d7c49c41c6f7cbc110-d6c0-4387-acd2-ef568de7b609

Assessments

CVSS by origin

10.0
security-advisories@github.comCVSS 3.1 · role Secondary · priority eligiblevalid_matchCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
10.0
GitHub_MCVSS 3.1 · role unknown · display onlyDirect record assessment retained outside normalized eligibilityCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Direct CVE/CNA normalized decisions

10.0Priority eligible

GitHub_M

CVSS 3.1 · Primary · Original assertion · rank 1

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Validation
Valid match
Recomputed
10.0
Decision reason
Evidence supported
Policy
casca-direct-cvss-eligibility-v1

Assessments are retained side by side under closed precedence. Cascade never averages CVSS.

Evidence boundaries

  • KEV membership is authoritative for the catalog, not proof of exposure in any environment.
  • EPSS is a dated model probability and not an individual-environment prediction.
  • Affected or fixed status applies only to the exact cited product and version scope; remaining scope stays source-scoped.
  • NVD-carried upstream facts remain derivative; independent corroboration requires a separately authored source.
  • Only NVD metrics validated under the generation-bound calculator are Public Priority eligible; direct CVE record metrics remain display-only.
  • NVD CVSS source eligibility is closed: NVD-authored, exact record-source, or registered same-CVE container origin; unmapped sources remain display-only.
  • Core replay supports the active and immediately prior generation; retrospective valid-at replay is deferred.
  • OSV aggregation and OSV-converted NVD material are not independent corroboration.
  • Red Hat facts are vendor assertions for the exact supplied products.
  • Nonmembership and not-yet-observed states are not proof of safety.