CVE-2025-24894Public exploitNetwork attack vector

User impersonation via first-signature validation

Published Feb 18, 2025 · Updated Feb 18, 2025

Improper authentication in SPID.AspNetCore.Authentication before 3.4.0 allows remote attackers to impersonate SPID or CIE users. VerifySignature in XmlHelpers.cs loads only the first XML signature and never confirms that its reference covers the root SAML response. A signed XML element from public IdP metadata therefore lets an unauthenticated attacker alter the assertion accepted for a service-provider session.

CVSS severity9.1
Critical
EPSS probability0.61%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper authentication in SPID.AspNetCore.Authentication before 3.4.0 allows remote attackers to impersonate SPID or CIE users. VerifySignature in XmlHelpers.cs loads only the first XML signature and never confirms that its reference covers the root SAML response. A signed XML element from public IdP metadata therefore lets an unauthenticated attacker alter the assertion accepted for a service-provider session.

The record

CVE
CVE-2025-24894
Published
Feb 18, 2025
Updated
Feb 18, 2025
Vendor
Developers Italia
Product
SPID.AspNetCore.Authentication
Classifications
CWE-287, T1606.002
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 18, 2025CVE publishedPublication date reported by the CVE source.
  2. Feb 18, 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=< 3.4.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Developers Italia · SPID.AspNetCore.Authenticationversion=< 3.4.0

Published CVSS scores

9.1GitHub, Inc.CVSS: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.

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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 exploitPublished

Weakness, pattern, technique

CWE-287Improper Authentication
T1606.002Forge Web Credentials: SAML Tokens

Public exploit references

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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