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01 Record

CVE-2026-102989

TanStack Router: Unauthenticated reflected XSS in TanStack Start server-function responses

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

02 Description

TanStack Router: Unauthenticated reflected XSS in TanStack Start server-function responses

03 Exploitation and scoring

Exploitation
Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.
SSVC decision
  • ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
  • 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
0.54% probability of exploitation activity in the next 30 days.
EPSS percentile
Equal to or higher than the score of 45.3% 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
Awaiting Analysis. 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
2026-10-13 16:13Z15 DAYS AGO
Last updated
2026-10-14 15:20Z14 DAYS AGO
Reserved
2026-09-29
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-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')Base
Data version
5.2
Document digest
c344c771c82f7f46e3a4da1d4b49933138b2c66668e82b0eb26b30f748c95f0b

05 Affected products

VendorProductVersionsPlatforms
TanStackrouter< release-2026-09-30-1747—
@tanstackreact-start>= 1.143.12, < 1.168.60—
@tanstacksolid-start>= 1.143.12, < 1.168.57—
@tanstackstart-server-core>= 1.143.12, < 1.169.39—
@tanstackvue-start>= 1.143.12, < 1.168.56—

06 References