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CVE-2026-40109

Flux notification-controller is the event forwarder and notification dispatcher for the GitOps Toolkit controllers. Prior to 1.8.3, the gcr Receiver type in Flux notification-controller does not validate the email claim of Google OIDC tokens used for Pub/Sub push authentication. This allows any valid Google-issued token, to authenticate against the Receiver webhook endpoint, triggering unauthorized Flux reconciliations. Exploitation requires the attacker to know the Receiver's webhook URL. The w
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:7e52a7cd9f74ddbde5ca7d8de0974fb12242d5605f60e2c3488efcfede9c8b3d
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

cwe · 2 assertions

{"cweId":"CWE-287","description":"CWE-287: Improper Authentication","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:fce40c7da45a60a7f3cff5757f5a44f83dc6af5dca8653958bca6ecdc4e11fe8 · sha256:1449d5586da2b9c6… · /containers/cna/problemTypes/0/descriptions/0

{"cweId":"CWE-345","description":"CWE-345: Insufficient Verification of Data Authenticity","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:fce40c7da45a60a7f3cff5757f5a44f83dc6af5dca8653958bca6ecdc4e11fe8 · sha256:1449d5586da2b9c6… · /containers/cna/problemTypes/1/descriptions/0

Affected products and versions

1 source assertion
{"product":"notification-controller","vendor":"fluxcd","versions":[{"status":"affected","version":"< 1.8.3"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:fce40c7da45a60a7f3cff5757f5a44f83dc6af5dca8653958bca6ecdc4e11fe8 · sha256:1449d5586da2b9c6… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":3.1,"baseSeverity":"LOW","confidentialityImpact":"NONE","integrityImpact":"LOW","privilegesRequired":"LOW","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:N","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:fce40c7da45a60a7f3cff5757f5a44f83dc6af5dca8653958bca6ecdc4e11fe8 · sha256:1449d5586da2b9c6… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

2 source assertions
{"cweId":"CWE-287","description":"CWE-287: Improper Authentication","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:fce40c7da45a60a7f3cff5757f5a44f83dc6af5dca8653958bca6ecdc4e11fe8 · sha256:1449d5586da2b9c6… · /containers/cna/problemTypes/0/descriptions/0
{"cweId":"CWE-345","description":"CWE-345: Insufficient Verification of Data Authenticity","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:fce40c7da45a60a7f3cff5757f5a44f83dc6af5dca8653958bca6ecdc4e11fe8 · sha256:1449d5586da2b9c6… · /containers/cna/problemTypes/1/descriptions/0

Source references

3 source assertions
{"name":"https://github.com/fluxcd/notification-controller/pull/1279","tags":["x_refsource_MISC"],"url":"https://github.com/fluxcd/notification-controller/pull/1279"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:fce40c7da45a60a7f3cff5757f5a44f83dc6af5dca8653958bca6ecdc4e11fe8 · sha256:1449d5586da2b9c6… · /containers/cna/references/1
{"name":"https://github.com/fluxcd/notification-controller/releases/tag/v1.8.3","tags":["x_refsource_MISC"],"url":"https://github.com/fluxcd/notification-controller/releases/tag/v1.8.3"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:fce40c7da45a60a7f3cff5757f5a44f83dc6af5dca8653958bca6ecdc4e11fe8 · sha256:1449d5586da2b9c6… · /containers/cna/references/2
{"name":"https://github.com/fluxcd/notification-controller/security/advisories/GHSA-h9cx-xjg6-5v2w","tags":["x_refsource_CONFIRM"],"url":"https://github.com/fluxcd/notification-controller/security/advisories/GHSA-h9cx-xjg6-5v2w"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:fce40c7da45a60a7f3cff5757f5a44f83dc6af5dca8653958bca6ecdc4e11fe8 · sha256:1449d5586da2b9c6… · /containers/cna/references/0

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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