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01 Record

CVE-2026-88064

Backstage: Improper input validation in TechDocs MkDocs configuration

HighPUBLISHEDCNA: GitHub_M
CNA base score8.8 CVSS v3.xCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
View raw JSON

02 Description

Backstage: Improper input validation in TechDocs MkDocs configuration

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
1.18% probability of exploitation activity in the next 30 days.
EPSS percentile
Equal to or higher than the score of 67.1% of scored records. A rank, not a probability.
NVD base score
8.8 (CVSS v3.x), scored by the NVD independently of the CNA.
NVD CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
NVD analysis status
Analyzed. NVD last modified this record on 2026-10-14.
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
2026-09-16 14:13Z1 MO AGO
Last updated
2026-09-16 15:46Z1 MO AGO
Reserved
2026-09-09
Assigning CNA
GitHub_M
Record state
PUBLISHED
Severity
High (CVSS 8.8)
CNA CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weaknesses
  • CWE-20Improper Input ValidationClass
  • CWE-1336Improper Neutralization of Special Elements Used in a Template EngineBase
Data version
5.2
Document digest
f49b5435f21c4a89919b8e1566464daa9dc847f7eb890a206343f3cadd10d5ac

05 Affected products

VendorProductVersionsPlatforms
backstagebackstage< 1.14.6, >= 1.15.0, < 1.15.4—

06 References