CVE-2015-20108Network attack vector

Code execution via interpolated XPath reference lookup

Published May 27, 2023 · Updated Jan 14, 2025

XPath injection in ruby-saml before 1.0.0 allows remote attackers to execute code through a crafted SAML signature reference URI. The validate_signature method interpolates the URI attribute into an at_xpath predicate, allowing XPath metacharacters to alter the signed-element lookup. An unauthenticated remote attacker must supply a SAML document whose Reference URI reaches signature verification; successful exploitation executes code in the consuming application's process.

CVSS severity9.8
Critical
EPSS probability1.33%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

XPath injection in ruby-saml before 1.0.0 allows remote attackers to execute code through a crafted SAML signature reference URI. The validate_signature method interpolates the URI attribute into an at_xpath predicate, allowing XPath metacharacters to alter the signed-element lookup. An unauthenticated remote attacker must supply a SAML document whose Reference URI reaches signature verification; successful exploitation executes code in the consuming application's process.

The record

CVE
CVE-2015-20108
Published
May 27, 2023
Updated
Jan 14, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-77, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 27, 2023CVE publishedPublication date reported by the CVE source.
  2. Jan 14, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

9.8NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.8CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-77Improper Neutralization of Special Elements used in a Command ('Command Injection')
T1190Exploit Public-Facing Application

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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