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01 Record

CVE-2026-53425

Missing InResponseTo validation in Samly allows acceptance of unsolicited SAML responses

HighPUBLISHEDCNA: EEF
CNA base score7.6 CVSS v4.0CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

02 Description

Missing InResponseTo validation in Samly allows acceptance of unsolicited SAML 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
0.22% probability of exploitation activity in the next 30 days.
EPSS percentile
Equal to or higher than the score of 12.7% of scored records. A rank, not a probability.
NVD base score
7.6 (CVSS v4.0), scored by the NVD independently of the CNA.
NVD CVSS vector
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
NVD analysis status
Awaiting Analysis. NVD last modified this record on 2026-10-26.
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
2026-08-20 17:26Z2 MO AGO
Last updated
2026-08-21 19:50Z2 MO AGO
Reserved
2026-06-09
Assigning CNA
EEF
Record state
PUBLISHED
Severity
High (CVSS 7.6)
CNA CVSS vector
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
Weaknesses
  • CWE-345Insufficient Verification of Data AuthenticityClass
Data version
5.2
Document digest
1b8b195f72ff5ac3c1be63511e9ccd6842bfd6b182c07e2e16d8bca47891208d

05 Affected products

VendorProductVersionsPlatforms
dropboxsamly0.3.0 to < *, 8a5bb1b4a4753d05470da2036323477f63cfdf4c to < *—
handnot2samly8a5bb1b4a4753d05470da2036323477f63cfdf4c to < *—

06 References