CVE-2026-45074Network attack vector

CAS user impersonation via Host-derived service URL

Published Jul 14, 2026 · Updated Jul 14, 2026

Authentication bypass in Symfony Security HTTP 7.1.0 through 7.4.11 and 8.0.0 through 8.0.11 allows remote attackers to impersonate CAS users. Cas2Handler derives the CAS service parameter from Request::getSchemeAndHttpHost(), accepting an attacker-controlled Host header as the ticket's target service. Exploitation requires absent trusted-host configuration, control of another application registered to the same CAS server, and a victim ticket; success authenticates the attacker as that victim.

CVSS severity7.6
High
EPSS probability0.49%
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 Symfony Security HTTP 7.1.0 through 7.4.11 and 8.0.0 through 8.0.11 allows remote attackers to impersonate CAS users. Cas2Handler derives the CAS service parameter from Request::getSchemeAndHttpHost(), accepting an attacker-controlled Host header as the ticket's target service. Exploitation requires absent trusted-host configuration, control of another application registered to the same CAS server, and a victim ticket; success authenticates the attacker as that victim.

The record

CVE
CVE-2026-45074
Published
Jul 14, 2026
Updated
Jul 14, 2026
Vendor
Symfony
Product
Symfony Security HTTP
Classifications
CWE-290, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 14, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 14, 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=>= 7.1.0-BETA1, < 7.4.12
  2. Affected versionversion=>= 8.0.0-BETA1, < 8.0.12

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Symfony · Symfony Security HTTPversion=>= 7.1.0-BETA1, < 7.4.12; version=>= 8.0.0-BETA1, < 8.0.12
Symfony · Symfonyversion=>= 7.1.0-BETA1, < 7.4.12; version=>= 8.0.0-BETA1, < 8.0.12

Published CVSS scores

7.6GitHub, Inc.CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
6.6GitHub Advisory DatabaseCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:U
8.1NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/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 exploitUnconfirmed

Weakness, pattern, technique

CWE-290Authentication Bypass by Spoofing
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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