CVE-2025-47949Network attack vector

Arbitrary-user authentication via unsigned assertion selection

Published May 19, 2025 · Updated May 20, 2025

Improper SAML signature verification in samlify before 2.10.0 allows remote attackers to authenticate as any user with a crafted response. The verifySignature routine validates one signed XML reference but previously returned an assertion selected separately from the original document, allowing wrapped unsigned content to be trusted. Exploitation requires a signed XML document from the identity provider and grants unauthorized access as any represented user.

CVSS severity9.9
Critical
EPSS probability0.47%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper SAML signature verification in samlify before 2.10.0 allows remote attackers to authenticate as any user with a crafted response. The verifySignature routine validates one signed XML reference but previously returned an assertion selected separately from the original document, allowing wrapped unsigned content to be trusted. Exploitation requires a signed XML document from the identity provider and grants unauthorized access as any represented user.

The record

CVE
CVE-2025-47949
Published
May 19, 2025
Updated
May 20, 2025
Vendor
Tony Ngan
Product
samlify
Classifications
CWE-347, T1606.002
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 19, 2025CVE publishedPublication date reported by the CVE source.
  2. May 20, 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=< 2.10.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Tony Ngan · samlifyversion=< 2.10.0

Published CVSS scores

9.9GitHub Advisory DatabaseCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:H/SI:H/SA: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-347Improper Verification of Cryptographic Signature
T1606.002Forge Web Credentials: SAML Tokens

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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