CVE-2024-25718Network attack vector

Authorization bypass via expired assertion reuse

Published Feb 11, 2024 · Updated Apr 24, 2025

Insufficient session expiration in handnot2 Samly before 1.4.0 allows remote attackers to retain access through expired SAML assertions. Samly.State.Store.get_assertion/3 returns cached assertions from ETS or the Plug session without comparing the subject notonorafter timestamp with the current time. A previously established SAML session is required, and Samly.AuthHandler continues authorizing the cached identity after its assertion expires.

CVSS severity9.3
Critical
EPSS probability0.66%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Insufficient session expiration in handnot2 Samly before 1.4.0 allows remote attackers to retain access through expired SAML assertions. Samly.State.Store.get_assertion/3 returns cached assertions from ETS or the Plug session without comparing the subject notonorafter timestamp with the current time. A previously established SAML session is required, and Samly.AuthHandler continues authorizing the cached identity after its assertion expires.

The record

CVE
CVE-2024-25718
Published
Feb 11, 2024
Updated
Apr 24, 2025
Vendor
handnot2
Product
Samly
Classifications
CWE-613, CWE-400, T1550.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 11, 2024CVE publishedPublication date reported by the CVE source.
  2. Apr 24, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <1.4.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

handnot2 · Samlyversion=0 <1.4.0

Published CVSS scores

9.3GitHub Advisory DatabaseCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.1CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-613Insufficient Session Expiration
CWE-400Uncontrolled Resource Consumption
T1550.004Use Alternate Authentication Material: Web Session Cookie

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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