CVE-2023-45683Network attack vector

Cross-site scripting via unvalidated ACS URL scheme

Published Oct 16, 2023 · Updated Sep 13, 2024

Cross-site scripting in CrewJam SAML before 0.4.14 allows remote attackers to run script in an IdP session through malicious SP metadata. Endpoint XML unmarshalling accepts javascript-scheme Location and ResponseLocation values for HTTP-based SAML bindings, letting the browser execute an ACS URI after SSO. Exploitation requires a victim to load an IdP-initiated SSO link for the malicious service provider; the script can perform authenticated IdP actions as that victim.

CVSS severity7.1
High
EPSS probability0.43%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cross-site scripting in CrewJam SAML before 0.4.14 allows remote attackers to run script in an IdP session through malicious SP metadata. Endpoint XML unmarshalling accepts javascript-scheme Location and ResponseLocation values for HTTP-based SAML bindings, letting the browser execute an ACS URI after SSO. Exploitation requires a victim to load an IdP-initiated SSO link for the malicious service provider; the script can perform authenticated IdP actions as that victim.

The record

CVE
CVE-2023-45683
Published
Oct 16, 2023
Updated
Sep 13, 2024
Vendor
CrewJam
Product
SAML
Classifications
CWE-79, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 16, 2023CVE publishedPublication date reported by the CVE source.
  2. Sep 13, 2024Record 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=< 0.4.14

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

CrewJam · SAMLversion=< 0.4.14

Published CVSS scores

7.1GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L
6.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/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-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1203Exploitation for Client Execution

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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