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CVE-2026-126269 NocoDB before 2026.09.0 Stored XSS via Attachment MIME Type

9.3 criticalEPSS 0.4%

Critical (9.3) in nocodb nocodb. EPSS 0.4% estimated probability of exploitation activity in the next 30 days.

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NocoDB before 2026.09.0 contains a stored cross-site scripting vulnerability that allows authenticated Editor users to execute scripts by storing crafted attachment MIME types like text/html;image/png. Attackers can write the value through the records API so the /dltemp signed URL serves HTML inline, stealing session tokens from localStorage to impersonate victims.

Severity

CVSS 4.0

9.3 critical
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:H/VI:H/VA:N/SC:H/SI:H/SA:N

CVSS 3.1

8.7 high
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N
EPSS
0.4% estimated probability of exploitation activity in the next 30 days; 31st percentile. Scored 2026-11-13. A forecast for this CVE across the internet, not for your own systems.
CWE
CWE-79 Improper Neutralization of Input During Web Page Generation (Cross-site Scripting)
OWASP Top 10
A05:2025 Injection
Published
Assigned by
VulnCheck (CNA)
NVD analysis
Awaiting analysis
Record from
the NVD, synced

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CVE-2026-126269

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[![CVE-2026-126269](https://cve.bz/cve/badge/CVE-2026-126269.svg)](https://cve.bz/cve/CVE-2026-126269)

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<a href="https://cve.bz/cve/CVE-2026-126269"><img src="https://cve.bz/cve/badge/CVE-2026-126269.svg" alt="CVE-2026-126269"></a>

Affected

Versions

From the CNA's record in the CVE List.

ProductAffected
nocodbbefore 2026.09.0

Attack patterns (CAPEC)

  • CAPEC-63 Cross-Site Scripting (XSS) Likelihood: High · Severity: Very High
  • CAPEC-85 AJAX Footprinting Likelihood: High · Severity: Low
  • CAPEC-209 XSS Using MIME Type Mismatch Severity: Medium
  • CAPEC-588 DOM-Based XSS Likelihood: High · Severity: Very High
  • CAPEC-591 Reflected XSS Likelihood: High · Severity: Very High
  • CAPEC-592 Stored XSS Likelihood: High · Severity: Very High

The attack patterns MITRE's CAPEC relates to this record's weaknesses, as MITRE names them. Credits.

References

Check your stackJSON