Tina is a headless content management system. Prior to 2.5.2, the TinaCMS CLI package's Vite dev server packages/@tinacms/cli/src/next/vite/cors.ts origin callback returns false for a disallowed origin but does not reject the request, and packages/@tinacms/cli/src/next/vite/plugins.ts still routes POST /media/upload/* to mediaRouter.handlePost. 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. A remote attacker can cause a developer's browser to submit this state-changing request by inducing the developer to visit an attacker-controlled page while tinacms dev is running. This issue is fixed in version 2.5.2.
CVE-2026-63123
MEDIUMPre-NVD 6.56.5—Trending — 3 sources updated this week
EchelonGraph scoreMEDIUM confidence
This medium-severity CVE scores 6.5 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.2%, top 90% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).
Triggered by: NVD CVSS baseline
Sources: epss, secondary
6.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
- Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 6.5Exploit: None knownExposed: 0
No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.
- CVSS v3
- 6.5
- EG Score
- 6.5(medium)
- EG Risk
- 34(Track)EG Risk 34/100SSVC: Track
EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).
How it’s computedSeverity65% × 45%Exploitation0% × 40%Automatability30% × 15%Action: Routine — remediate on your standard cadence. - EPSS PROB
- 0%
- EPSS %ILE
- 10%
- KEV
- Not listed
Published
August 19, 2026
Last Modified
August 19, 2026
Advisory Details (3)
Auto-updated Aug 19, 2026🔬 Proof of concept available. Patch available. Sources: github, github_pr, github_commit.
github_commit Patch Available
commit 211997cdb53c (tinacms/tinacms)
Patch available: tinacms/tinacms [email protected] (contains commit 211997cdb53c)
https://github.com/tinacms/tinacms/commit/211997cdb53cbd43638bdee999faa65375cfc260github_pr Patch Available
Reject cross-origin state-changing requests on the dev server
Patch available: tinacms/tinacms [email protected] (PR #7111 merged 2026-06-29)
https://github.com/tinacms/tinacms/pull/7111github Patch Available🟡 PoC Available
Cross-origin `POST /media/upload/*` requests can write arbitrary files into the Tina dev server media root · Advisory · tinacms/tinacms · GitHub
https://github.com/tinacms/tinacms/security/advisories/GHSA-rgr9-r7mj-mf6xVendor Advisories for CVE-2026-63123(1)
These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.
Weakness Classification(1)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 5× in last 7d / 5× in last 30d)
Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.
- 2026-08-21 00:16 UTCEG score recompute
- 2026-08-20 22:55 UTCEPSS rescore
- 2026-08-19 22:18 UTCEG score recompute
- 2026-08-19 21:48 UTCEG score recompute
- 2026-08-19 21:47 UTCMITRE cvelistV5first tracked
Related CVEs(same CWE)
Frequently asked(5)
What is CVE-2026-63123?
CVE-2026-63123 is a medium vulnerability published on August 19, 2026. Tina is a headless content management system. Prior to 2.5.2, the TinaCMS CLI package's Vite dev server packages/@tinacms/cli/src/next/vite/cors.ts origin callback returns false for a disallowed origin but does not reject the request, and packages/@tinacms/cli/src/next/vite/plugins.ts still routes…
When was CVE-2026-63123 disclosed?
CVE-2026-63123 was first published in the National Vulnerability Database on August 19, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-63123 actively exploited?
CVE-2026-63123 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 90.4% of all scored CVEs.
What is the CVSS score of CVE-2026-63123?
CVE-2026-63123 has a CVSS v3 base score of 6.5 (NVD).
How do I remediate CVE-2026-63123?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-63123, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.
Dependency Blast Radius
Explore the affected products and dependency analysis for CVE-2026-63123
Is Your Infrastructure Affected by CVE-2026-63123?
EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.