CVE-2026-49823Network attack vector

Cross-namespace Package disclosure via unchecked Function reference

Published Jun 10, 2026 · Updated Jun 10, 2026

Incorrect authorization in Fission before 1.24.0 allows remote authenticated users to read Packages across Kubernetes namespaces. Function admission validation omits a same-namespace check for spec.package.packageref.namespace, so the fetcher sidecar uses its service account to copy the referenced archive into the attacker's pod. A user needs functions.fission.io/create in one namespace; invoking the Function exposes source code and embedded credentials from another namespace without permitting modification or interruption.

CVSS severity7.7
High
EPSS probability0.27%
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 read Packages across Kubernetes namespaces. Function admission validation omits a same-namespace check for spec.package.packageref.namespace, so the fetcher sidecar uses its service account to copy the referenced archive into the attacker's pod. A user needs functions.fission.io/create in one namespace; invoking the Function exposes source code and embedded credentials from another namespace without permitting modification or interruption.

The record

CVE
CVE-2026-49823
Published
Jun 10, 2026
Updated
Jun 10, 2026
Vendor
Fission
Product
Fission
Classifications
CWE-863, CWE-284, T1552.001
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

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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

7.7GitHubCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/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 exploitUnconfirmed

Weakness, pattern, technique

CWE-863Incorrect Authorization
CWE-284Improper Access Control
T1552.001Credentials In Files

Public exploit references

No public exploit references are available in this record.

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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