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01 Record

CVE-2026-108261

TinaCMS admin preview iframe loads an attacker-controlled origin from the URL fragment

CriticalPUBLISHEDCNA: GitHub_M
CNA base score9.3 CVSS v3.xCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N
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02 Description

TinaCMS admin preview iframe loads an attacker-controlled origin from the URL fragment

03 Exploitation and scoring

Exploitation
Public exploit code exists. CISA's assessment records a public proof of concept. That is not a report of exploitation in the wild.
SSVC decision
  • ExploitationpocPublic proof-of-concept exploit code exists. Not a report of exploitation in the wild.
  • AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
  • Technical ImpacttotalSuccessful exploitation gives total control of the vulnerable component.
CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.
EPSS probability
0.19% probability of exploitation activity in the next 30 days.
EPSS percentile
Equal to or higher than the score of 9.3% of scored records. A rank, not a probability.
NVD base score
9.3 (CVSS v3.x), scored by the NVD independently of the CNA.
NVD CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N
NVD analysis status
Deferred. NVD last modified this record on 2026-10-16.
Red Hat severity
No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published
2026-10-09 20:43Z19 DAYS AGO
Last updated
2026-10-13 11:24Z15 DAYS AGO
Reserved
2026-10-09
Assigning CNA
GitHub_M
Record state
PUBLISHED
Severity
Critical (CVSS 9.3)
CNA CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N
Weaknesses
  • CWE-346Origin Validation ErrorClass
  • CWE-441Unintended Proxy or Intermediary ('Confused Deputy')Class
  • CWE-601URL Redirection to Untrusted Site ('Open Redirect')Base
Data version
5.2
Document digest
39fec42278559e812c1d5733c9757a344c0eda5012f50e212bdc0ac11515cbd2

05 Affected products

VendorProductVersionsPlatforms
tinacmstinacms< 3.14.0—
@tinacmsapp< 2.5.14—

06 References