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CVE-2026-63123 tinacms CVE debrief

The CVE-2026-63123 vulnerability affects TinaCMS CLI, specifically the Vite dev server, allowing a remote attacker to submit a state-changing request by inducing a developer to visit an attacker-controlled page. This issue, fixed in version 2.5.2, has a MEDIUM severity with a CVSS score of 6.5. Developers should update to the latest version and restrict access to the media root. The vulnerability involves packages/@tinacms/cli/src/next/vite/cors.ts and packages/@tinacms/cli/src/next/vite/plugins.ts, enabling potential code execution or data tampering. Evidence is limited, so defenders should verify affected systems, review configurations, and monitor for suspicious activity.

Vendor
tinacms
Product
Unknown
CVSS
MEDIUM 6.5
CISA KEV
Not listed in stored evidence
Original CVE published
2026-08-19
Original CVE updated
2026-08-25
Advisory published
2026-08-19
Advisory updated
2026-08-25

Who should care

Developers using TinaCMS CLI, especially those who use the Vite dev server, should be aware of this vulnerability and take steps to mitigate it. This includes updating to the latest version and restricting access to the media root. Security teams and operators should review system configurations and monitor for suspicious requests to /media/upload/*.

Technical summary

The TinaCMS CLI package's Vite dev server has a vulnerability in packages/@tinacms/cli/src/next/vite/cors.ts and packages/@tinacms/cli/src/next/vite/plugins.ts. A remote attacker can cause a developer's browser to submit a state-changing request by inducing the developer to visit an attacker-controlled page while tinacms dev is running. This issue allows for potential code execution or data tampering.

Defensive priority

Developers using TinaCMS CLI should update to version 2.5.2 to address the vulnerability.

Recommended defensive actions

  • Update TinaCMS CLI to version 2.5.2
  • Review and restrict access to the media root
  • Monitor for suspicious requests to /media/upload/*
  • Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up.
  • Review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance.
  • Plan vendor-supported updates or mitigations through normal change control where exposure is confirmed.
  • Check relevant monitoring, detection, and logs for exposed assets that need extra review.

Evidence notes

The TinaCMS CLI package's Vite dev server has a vulnerability in packages/@tinacms/cli/src/next/vite/cors.ts and packages/@tinacms/cli/src/next/vite/plugins.ts. The upload code in packages/@tinacms/cli/src/next/commands/dev-command/server/media.ts writes attacker-controlled multipart contents inside the configured media root. Evidence is limited to public statements and developer notes. Defenders should verify affected systems, review configuration, and monitor for suspicious activity.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-63123 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-63123

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-63123 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-63123

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.