Security readout for executives and security teams
Plain-English summary
This issue affects jwt-go versions before 4.0.0-preview1. A token audience claim represented as a string array could be mishandled, causing the audience value to become empty. If an application does not independently verify audience, access controls can be bypassed.
Executive priority
Treat as high priority for systems where JWT audience controls protect customer data, internal APIs, or multi-tenant boundaries. Risk depends on vulnerable dependency use and missing audience checks.
Technical view
jwt-go incorrectly handled valid JWT aud claims encoded as []string. The failed type assertion resulted in an empty aud value. Services relying on this library behavior, without their own audience validation, could accept tokens outside the intended audience boundary.
Likely exposure
Exposure is most likely in Go services using github.com/dgrijalva/jwt-go before 4.0.0-preview1 for JWT validation, especially where audience restrictions gate API or service access.
Exploitation context
The provided sources do not show CISA KEV listing or active exploitation. The issue is remotely reachable when vulnerable services accept JWTs over a network and lack independent audience checks.
Researcher notes
The CVE description identifies the vulnerable condition clearly, but the bundle lists affected vendor and product as n/a. Validate actual package use and application-specific audience handling before declaring exposure.
Mitigation direction
- Inventory Go services using github.com/dgrijalva/jwt-go.
- Upgrade jwt-go to 4.0.0-preview1 or later where supported.
- Verify each service enforces expected audience values itself.
- Review vendor guidance before changing authentication-critical code.
- Prioritize internet-facing APIs and service-to-service auth paths.
Validation and detection
- Check go.mod and go.sum for vulnerable jwt-go versions.
- Review JWT validation code for explicit audience enforcement.
- Add safe unit tests for array-form aud claims.
- Confirm dependency scanning no longer flags CVE-2020-26160.
- Regression test authorization boundaries after dependency changes.
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.
Credential and access behavior lookup
The CVE wording references authentication or credential exposure, so valid-account and credential-access review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2020-26160 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
- 7.5 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AC:L/AV:N/A:N/C:H/I:N/PR:N/S:U/UI: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/AC:L/AV:N/A:N/C:H/I:N/PR:N/S:U/UI:N3.93.6Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
7.5HighVector: CVSS:3.1/AC:L/AV:N/A:N/C:H/I:N/PR:N/S:U/UI:N
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/dgrijalva/jwt-go/pull/426CVE reference · x_refsource_MISC
- https://snyk.io/vuln/SNYK-GOLANG-GITHUBCOMDGRIJALVAJWTGO-596515CVE 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.