EEF-CVE-2026-53424
- Source
- https://cna.erlef.org/osv/EEF-CVE-2026-53424.html
- Import Source
- https://cna.erlef.org/osv/EEF-CVE-2026-53424.json
- JSON Data
- https://api.osv.dev/v1/vulns/EEF-CVE-2026-53424
- Aliases
-
- CVE-2026-53424
- Published
- 2026-08-20T17:27:11.115Z
- Modified
- 2026-08-20T18:45:05.958784591Z
- Severity
-
- 9.1 (Critical) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N CVSS Calculator
- Summary
- Missing one-time-use enforcement in Samly allows replay of SAML bearer assertions
- Details
-
Summary
Authentication Bypass by Capture-replay vulnerability in dropbox samly allows an attacker to authenticate as the subject of a captured SAML assertion by resubmitting it.
Samly.Helper.decode_idp_auth_resp/3 in lib/samly/helper.ex calls esaml_sp:validate_assertion/2, whose default duplicate detector is a no-op. The /3 arity accepting a DuplicateFun exists in esaml and implements the check, but Samly never calls it and offers no configuration to supply one, so the SAML 2.0 Web Browser SSO Profile requirement that a bearer assertion be used once is unenforced. An attacker holding a valid SAMLResponse obtained from the network, from browser history, or from logs can submit the identical bytes repeatedly until the assertion's NotOnOrAfter passes, each time establishing a session as the assertion's subject.
This issue affects samly: from 0.3.0 onward.
- Database specific
{ "capec_ids": [ "CAPEC-60" ], "cwe_ids": [ "CWE-294" ], "cpe_ids": [ "cpe:2.3:a:dropbox:samly:*:*:*:*:*:*:*:*", "cpe:2.3:a:handnot2:samly:*:*:*:*:*:*:*:*" ] }- References
- Credits
-
-
- Mark Madsen - REPORTER
-
- Jonatan Männchen / EEF - COORDINATOR
-
Affected packages
Hex / samly
Package
- Name
- samly
- Purl
- pkg:hex/samly