Security readout for executives and security teams
Plain-English summary
CVE-2026-2808 lets a highly privileged attacker read arbitrary files from affected HashiCorp Consul deployments when Kubernetes authentication is configured. The main business risk is exposure of sensitive local files or secrets. HashiCorp rates it medium severity and has released fixed Consul versions.
Executive priority
Treat as a timely patching item for Consul environments using Kubernetes authentication, especially where Consul hosts sensitive configuration or secrets. It is not currently supported by sources as an emergency active-exploitation issue.
Technical view
HashiCorp Consul and Consul Enterprise versions 1.18.20 through 1.21.10, and 1.22.4, are affected when configured with Kubernetes authentication. The flaw is an arbitrary file read issue associated with the Vault Kubernetes authentication provider. CVSS 3.1 is 6.8: network reachable, low complexity, high privileges required, confidentiality high.
Likely exposure
Exposure appears limited to Consul or Consul Enterprise deployments using the affected versions and Kubernetes authentication. Systems not using that configuration are less likely to be exploitable based on the available sources.
Exploitation context
The CVSS vector indicates exploitation is network-accessible but requires high privileges and no user interaction. The source bundle does not indicate active exploitation, public exploit availability, or CISA KEV listing.
Researcher notes
Available public detail is limited. The issue maps to CWE-59 and arbitrary file read, with high confidentiality impact and high privileges required. Avoid assuming broader configurations or exploitability beyond Kubernetes authentication unless HashiCorp publishes more detail.
Mitigation direction
- Upgrade Consul 1.18.x to 1.18.21 or later fixed release.
- Upgrade Consul 1.21.x to 1.21.11 or later fixed release.
- Upgrade Consul 1.22.x to 1.22.5 or later fixed release.
- Review HashiCorp advisory for environment-specific guidance.
- Prioritize systems using Kubernetes authentication.
Validation and detection
- Inventory Consul and Consul Enterprise versions.
- Identify deployments configured with Kubernetes authentication.
- Confirm upgraded systems report fixed versions.
- Review access controls for highly privileged Consul users.
- Check logs for unusual authentication-provider file access indicators, if available.
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-59: 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 lookupFile access behavior lookup
The CVE wording references file access or upload behavior, so file telemetry and web shell review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program 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-2026-2808 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
- Medium
- CVSS
- 6.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:N/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:H/UI:N/S:C/C:H/I:N/A:N2.34Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
6.8MediumVector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:N/A:N
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.
Improper Link Resolution Before File Access ('Link Following')
Improper Link Resolution Before File Access ('Link Following') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.