Security readout for executives and security teams
Plain-English summary
CVE-2026-24470 affects Zalando Skipper used as a Kubernetes Ingress controller. A Kubernetes user who can create both Ingress objects and ExternalName Services may route traffic through Skipper to internal services they should not reach. This can expose or allow modification of sensitive internal systems, depending on reachable services.
Executive priority
Prioritize remediation for shared Kubernetes clusters or environments with delegated namespace administration. This issue can turn ordinary configuration rights into unauthorized internal service access. Treat as high priority where Skipper can reach sensitive internal systems.
Technical view
Before Skipper 0.24.0, ExternalName Services were allowed by default in Ingress routing. With low Kubernetes privileges, an attacker could define an Ingress and ExternalName Service causing Skipper to act as a proxy to internal targets. The CVSS score is 8.1, with high confidentiality and integrity impact and no user interaction required.
Likely exposure
Exposure is likely limited to Kubernetes clusters running Skipper as an Ingress controller before version 0.24.0, where users or workloads can create Ingress resources and ExternalName Services. Clusters with strict RBAC preventing those combined permissions have reduced exposure.
Exploitation context
The sources describe a privilege-abuse path using legitimate Kubernetes objects, not a remote unauthenticated takeover. No cited source or KEV listing indicates active exploitation. The main risk is lateral access through Skipper’s network position into internal services.
Researcher notes
The advisory maps to CWE-441 and CWE-918, reflecting confused-deputy and server-side request forgery style behavior. The key control boundary is Skipper’s network reach versus Kubernetes users’ object creation rights. Evidence is sufficient for affected versions and vendor mitigation, but public sources do not show exploitation in the wild.
Mitigation direction
- Upgrade Skipper to version 0.24.0 or later.
- Confirm ExternalName support is disabled unless explicitly required.
- If ExternalName is required, allow-list approved targets.
- Use regular-expression allow-lists only as advised by vendor guidance.
- Review Kubernetes RBAC for Ingress and ExternalName Service creation rights.
Validation and detection
- Inventory clusters using Skipper as an Ingress controller.
- Check deployed Skipper versions for releases before 0.24.0.
- Identify namespaces where users can create both Ingress and ExternalName Services.
- Review existing ExternalName Services referenced by Ingress routes.
- Verify configured allow-lists match approved internal and external targets.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-441: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCWE-918: Information exposure and cloud metadata lookup
Information exposure and SSRF weaknesses can make discovery, cloud metadata, and credential material review relevant. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupContainer behavior lookup
The affected technology mentions containers, so container-specific ATT&CK technique review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2026-24470 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- High
- CVSS
- 8.1 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N2.85.2Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
8.1HighVector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/zalando/skipper/security/advisories/GHSA-mxxc-p822-2hx9CVE reference · x_refsource_CONFIRM
- https://github.com/zalando/skipper/commit/a4c87ce029a58eb8e1c2c1f93049194a39cf6219CVE reference · x_refsource_MISC
- https://kubernetes.io/docs/concepts/services-networking/service/#externalnameCVE reference · x_refsource_MISC
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Unintended Proxy or Intermediary ('Confused Deputy')
Unintended Proxy or Intermediary ('Confused Deputy') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.
Server-Side Request Forgery (SSRF)
Server-Side Request Forgery (SSRF) represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.