CVE-2026-5343Network attack vector

Unauthenticated privilege escalation via insufficient access blocking

Published May 28, 2026 · Updated May 28, 2026

Authentication bypass in Drupal SAML SSO - Service Provider before 3.1.4 allows remote attackers to gain elevated site privileges. The module does not sufficiently block access during the SAML authentication flow, but Drupal has not disclosed the affected function or mishandled exceptional condition. Exploitation requires network access to a Drupal site using the module and yields unauthorized access with confidentiality and integrity impact but no reported service interruption.

CVSS severity7.4
High
EPSS probability0.26%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication bypass in Drupal SAML SSO - Service Provider before 3.1.4 allows remote attackers to gain elevated site privileges. The module does not sufficiently block access during the SAML authentication flow, but Drupal has not disclosed the affected function or mishandled exceptional condition. Exploitation requires network access to a Drupal site using the module and yields unauthorized access with confidentiality and integrity impact but no reported service interruption.

The record

CVE
CVE-2026-5343
Published
May 28, 2026
Updated
May 28, 2026
Vendor
Avatar Uploader Project
Product
SAML SSO - Service Provider
Classifications
CWE-754, CAPEC-233, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 28, 2026CVE publishedPublication date reported by the CVE source.
  2. May 28, 2026Record 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=0.0.0 <3.1.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Avatar Uploader Project · SAML SSO - Service Providerversion=0.0.0 <3.1.4

Published CVSS scores

7.4CISA-ADPCVSS:3.1/AV:N/AC:H/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-754Improper Check for Unusual or Exceptional Conditions
CAPEC-233Privilege Escalation
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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