CVE-2026-49824Public exploitNetwork attack vector

Cross-tenant code execution via unvalidated EnvironmentRef

Published Jun 10, 2026 · Updated Jun 10, 2026

Incorrect authorization in Fission before 1.24.0 allows remote authenticated users to execute function code in another tenant's image. The Function admission webhook accepts a spec.environment.namespace that differs from metadata.namespace, and poolmgr or newdeploy then retrieves the victim's Environment CRD. Permission to create Functions in one namespace is sufficient, exposing credentials embedded in the victim image and enabling confused-deputy use of privileged sidecars.

CVSS severity8.5
High
EPSS probability0.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Incorrect authorization in Fission before 1.24.0 allows remote authenticated users to execute function code in another tenant's image. The Function admission webhook accepts a spec.environment.namespace that differs from metadata.namespace, and poolmgr or newdeploy then retrieves the victim's Environment CRD. Permission to create Functions in one namespace is sufficient, exposing credentials embedded in the victim image and enabling confused-deputy use of privileged sidecars.

The record

CVE
CVE-2026-49824
Published
Jun 10, 2026
Updated
Jun 10, 2026
Vendor
Fission
Product
Fission
Classifications
CWE-863, CWE-284, T1210
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 10, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 10, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 1.24.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Fission · Fissionversion=< 1.24.0

Published CVSS scores

8.5GitHubCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-863Incorrect Authorization
CWE-284Improper Access Control
T1210Exploitation of Remote Services

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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