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01 Record

CVE-2026-40477

Improper restriction of the scope of accessible objects in Thymeleaf expressions

CriticalPUBLISHEDCNA: GitHub_M
CNA base score9.1 CVSS v3.xCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
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02 Description

Improper restriction of the scope of accessible objects in Thymeleaf expressions

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
0.85% probability of exploitation activity in the next 30 days.
EPSS percentile
Equal to or higher than the score of 57.9% of scored records. A rank, not a probability.
NVD base score
9.0 (CVSS v3.x), scored by the NVD independently of the CNA.
NVD CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
NVD analysis status
Modified. NVD last modified this record on 2026-10-26.
Red Hat severity
Important. Red Hat's rating for its own products, not a CVSS rating.

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
2026-04-17 21:53Z6 MO AGO
Last updated
2026-08-17 12:04Z2 MO AGO
Reserved
2026-04-13
Assigning CNA
GitHub_M
Record state
PUBLISHED
Severity
Critical (CVSS 9.1)
CNA CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
Weaknesses
  • CWE-917Improper Neutralization of Special Elements used in an Expression Language Statement ('Expression Language Injection')Base
  • CWE-1336Improper Neutralization of Special Elements Used in a Template EngineBase
Data version
5.2
Document digest
90214d266bf541a35c3247e8fede0d7c97dc11cbbf17456c62e9a5627139f5a3

05 Affected products

VendorProductVersionsPlatforms
thymeleafthymeleaf< 3.1.4.RELEASE—
thymeleaforg.thymeleaf:thymeleaf-spring5< 3.1.4.RELEASE—
thymeleaforg.thymeleaf:thymeleaf-spring6< 3.1.4.RELEASE—

06 References