How severe is CVE-2024-45409?

CVE-2024-45409 has a CVSS 3.x base score of 10.0, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.

Is CVE-2024-45409 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 11% (95th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2024-45409?

CVE-2024-45409 primarily affects Onelogin Ruby-saml. In total, 5 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2024-45409?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

Does CVE-2024-45409 have an EU (EUVD) identifier?

Yes. CVE-2024-45409 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2024-2828.

When was CVE-2024-45409 published?

CVE-2024-45409 was published on 2024-09-10 and last updated on 2026-06-17.

CVE-2024-45409

CVE-2024-45409 is a critical-severity vulnerability in Onelogin Ruby-saml with a CVSS 3.x base score of 10.0. Its EPSS exploit-prediction score of 11% places it in the 95th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-347.

Key facts

Severity: Critical (CVSS 3.x base score 10.0)
EPSS exploit prediction: 11% (95th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2024-2828
Weakness: CWE-347
Affected product: Onelogin Ruby-saml
Published: 2024-09-10
Last modified: 2026-06-17

Description

The Ruby SAML library is for implementing the client side of a SAML authorization. Ruby-SAML in <= 12.2 and 1.13.0 <= 1.16.0 does not properly verify the signature of the SAML Response. An unauthenticated attacker with access to any signed saml document (by the IdP) can thus forge a SAML Response/Assertion with arbitrary contents. This would allow the attacker to log in as arbitrary user within the vulnerable system. This vulnerability is fixed in 1.17.0 and 1.12.3.

Frequently asked questions

What is CVE-2024-45409?: The Ruby SAML library is for implementing the client side of a SAML authorization. Ruby-SAML in <= 12.2 and 1.13.0 <= 1.16.0 does not properly verify the signature of the SAML Response. An unauthenticated attacker with access to any signed saml document (by the IdP) can thus forge a SAML Response/Assertion with arbitrary contents. This would allow the attacker to log in as arbitrary user within the vulnerable system. This vulnerability is fixed in 1.17.0 and 1.12.3.
How severe is CVE-2024-45409?: CVE-2024-45409 has a CVSS 3.x base score of 10.0, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.
Is CVE-2024-45409 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 11% (95th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2024-45409?: CVE-2024-45409 primarily affects Onelogin Ruby-saml. In total, 5 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2024-45409?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2024-45409 have an EU (EUVD) identifier?: Yes. CVE-2024-45409 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2024-2828.
When was CVE-2024-45409 published?: CVE-2024-45409 was published on 2024-09-10 and last updated on 2026-06-17.

References

Affected products (5)

cpe:2.3:a:onelogin:ruby-saml:*:*:*:*:*:*:*:*
cpe:2.3:a:omniauth:omniauth_saml:*:*:*:*:*:ruby:*:*
cpe:2.3:a:omniauth:omniauth_saml:2.0.0:*:*:*:*:ruby:*:*
cpe:2.3:a:omniauth:omniauth_saml:2.1.0:*:*:*:*:ruby:*:*
cpe:2.3:a:gitlab:gitlab:*:*:*:*:*:*:*:*

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