TI-2026-45239 Aliases CVE-2026-63506 GHSA-g74q-6g2f-874x

Tina: [Broken Access Control] letting any TinaCloud user authorize against any self-hosted site

HIGH 73CWE-639Published 2026-09-16 · Updated 2026-09-17

Key facts

Attack vector: Network
Privileges required: Low
User interaction: None
Attack complexity: Low
Impact type: Security bypass
Confidentiality · integrity · availability: High · High · High
Fix status: Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-639.

Summary

Tina is a headless content management system. Prior to @tinacms/auth 1.1.4 and next-tinacms-azure 15.0.1, isAuthorized accepts a request-controlled clientID and asks isUserAuthorized to validate the bearer token against that selected TinaCloud app instead of the self-hosted site's configured app. An attacker with any TinaCloud account can submit the attacker's own app ID and valid token to a victim endpoint, causing TinaCloudBackendAuthProvider or an affected media authorized callback to accept the attacker's verified status across the tenant boundary. The vulnerable logic is present in packages/@tinacms/auth/src/index.ts and packages/next-tinacms-azure/src/auth.ts. Successful exploitation permits media listing, reading, upload, or deletion and, when TinaCloudBackendAuthProvider is used, GraphQL read, create, update, and delete operations on the victim's content without a victim account or victim interaction. This vulnerability is fixed in @tinacms/auth 1.1.4 and next-tinacms-azure 15.0.1.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.00523 44th percentileScored 2026-11-07

Fix Fixed tinacms (tinacms): 1.1.4auth (@tinacms): 1.1.4+3 more products

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: Poc
Automatable: No
Technical impact: Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
tinacms	tinacms	before 1.1.4	1.1.4	Patch available	CNA
tinacms	auth	before 1.1.4	1.1.4	Patch available	CNA
tinacms	next-tinacms-azure	before 15.0.1	15.0.1	Patch available	CNA
—	@tinacms/auth (npm)	before 1.1.4	1.1.4	Patch available	GHSA-g74q-6g2f-874x
—	next-tinacms-azure (npm)	before 15.0.1	15.0.1	Patch available	GHSA-g74q-6g2f-874x

tinacms Vendortinacms Affected before 1.1.4 Fixed in 1.1.4 Patch available CNA
auth Vendortinacms Affected before 1.1.4 Fixed in 1.1.4 Patch available CNA
next-tinacms-azure Vendortinacms Affected before 15.0.1 Fixed in 15.0.1 Patch available CNA
@tinacms/auth (npm) Vendor— Affected before 1.1.4 Fixed in 1.1.4 Patch available GHSA-g74q-6g2f-874x
next-tinacms-azure (npm) Vendor— Affected before 15.0.1 Fixed in 15.0.1 Patch available GHSA-g74q-6g2f-874x

Remediation

Fix · CNA tinacms (tinacms) Fixed in 1.1.4
Fix · CNA auth (@tinacms) Fixed in 1.1.4
Fix · CNA next-tinacms-azure (tinacms) Fixed in 15.0.1
Fix · GHSA-g74q-6g2f-874x @tinacms/auth (npm) Fixed in 1.1.4 Advisory →
Fix · GHSA-g74q-6g2f-874x next-tinacms-azure (npm) Fixed in 15.0.1 Advisory →

Timeline

2026-10-02 Threatist record created from CVE-2026-63506
2026-10-03 Alias added: GHSA-g74q-6g2f-874x

References

Advisory 1

https://nvd.nist.gov/vuln/detail/CVE-2026-63506

Other 6

TI-2026-22987 Cross-Origin File Exfiltration via CORS Misconfiguration + Path Traversal in TinaCMS CVSS 3.1CRITICAL 9.7
TI-2026-70295 TinaCMS admin preview frames attacker-controlled origin CVSS 3.1CRITICAL 9.3
TI-2026-26851 @tinacms/graphql's `FilesystemBridge` Path Validation Can Be Bypassed via Symlinks or Junctions CVSS 3.1HIGH 8.8
TI-2026-22988 Path Traversal Leading to Arbitrary File Read, Write and Delete in TinaCMS CVSS 3.1HIGH 8.4
TI-2026-70293 Code injection in Tina CLI via unescaped Git branch name CVSS 3.1HIGH 8.2
TI-2026-26850 @tinacms/graphql's Media Endpoints Can Escape the Media Root via Symlinks or Junctions CVSS 3.1HIGH 8.3

See all 19 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences