How severe is CVE-2023-4612?

CVE-2023-4612 has a CVSS 3.x base score of 9.8, 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 high.

Is CVE-2023-4612 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (57th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-4612?

CVE-2023-4612 primarily affects Apereo Central Authentication Service. In total, 8 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2023-4612?

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.

When was CVE-2023-4612 published?

CVE-2023-4612 was published on 2023-11-09 and last updated on 2026-06-17.

CVE-2023-4612

CVE-2023-4612 is a critical-severity vulnerability in Apereo Central Authentication Service with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-287.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
EPSS exploit prediction: 1% (57th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-287
Affected product: Apereo Central Authentication Service
Published: 2023-11-09
Last modified: 2026-06-17

Description

Improper Authentication vulnerability in Apereo CAS in jakarta.servlet.http.HttpServletRequest.getRemoteAddr method allows Multi-Factor Authentication bypass.This issue affects CAS: through 7.0.0-RC7. It is unknown whether in new versions the issue will be fixed. For the date of publication there is no patch, and the vendor does not treat it as a vulnerability.

Frequently asked questions

What is CVE-2023-4612?: Improper Authentication vulnerability in Apereo CAS in jakarta.servlet.http.HttpServletRequest.getRemoteAddr method allows Multi-Factor Authentication bypass.This issue affects CAS: through 7.0.0-RC7. It is unknown whether in new versions the issue will be fixed. For the date of publication there is no patch, and the vendor does not treat it as a vulnerability.
How severe is CVE-2023-4612?: CVE-2023-4612 has a CVSS 3.x base score of 9.8, 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 high.
Is CVE-2023-4612 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (57th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-4612?: CVE-2023-4612 primarily affects Apereo Central Authentication Service. In total, 8 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2023-4612?: 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.
When was CVE-2023-4612 published?: CVE-2023-4612 was published on 2023-11-09 and last updated on 2026-06-17.

References

Affected products (8)

cpe:2.3:a:apereo:central_authentication_service:*:*:*:*:*:*:*:*
cpe:2.3:a:apereo:central_authentication_service:7.0.0:rc1:*:*:*:*:*:*
cpe:2.3:a:apereo:central_authentication_service:7.0.0:rc2:*:*:*:*:*:*
cpe:2.3:a:apereo:central_authentication_service:7.0.0:rc3:*:*:*:*:*:*
cpe:2.3:a:apereo:central_authentication_service:7.0.0:rc4:*:*:*:*:*:*
cpe:2.3:a:apereo:central_authentication_service:7.0.0:rc5:*:*:*:*:*:*
cpe:2.3:a:apereo:central_authentication_service:7.0.0:rc6:*:*:*:*:*:*
cpe:2.3:a:apereo:central_authentication_service:7.0.0:rc7:*:*:*:*:*:*

More vulnerabilities in Apereo Central Authentication Service

CVE-2024-4399 — Critical (CVSS 9.1): The does not validate a parameter before making a request to it, which could allow unauthenticated users to perform…
CVE-2019-10754 — High (CVSS 8.1): Multiple classes used within Apereo CAS before release 6.1.0-RC5 makes use of apache commons-lang3 RandomStringUtils…
CVE-2020-27178 — High (CVSS 7.5): Apereo CAS 5.3.x before 5.3.16, 6.x before 6.1.7.2, 6.2.x before 6.2.4, and 6.3.x before 6.3.0-RC4 mishandles secret…
CVE-2015-1169 — High (CVSS 7.5): Apereo Central Authentication Service (CAS) Server before 3.5.3 allows remote attackers to conduct LDAP injection…
CVE-2024-11209 — Medium (CVSS 6.3): A vulnerability was found in Apereo CAS 6.6. It has been classified as critical. This affects an unknown part of the…
CVE-2021-42567 — Medium (CVSS 6.1): Apereo CAS through 6.4.1 allows XSS via POST requests sent to the REST API endpoints.

All CVEs affecting Apereo Central Authentication Service →

Other CWE-287 (Improper Authentication) vulnerabilities

CVE-2026-45480 — Critical (CVSS 10.0): Improper authentication in Azure Active Directory allows an unauthorized attacker to elevate privileges over a network.
CVE-2026-46389 — Critical (CVSS 10.0): UDS Identity Config builds the Keycloak configuration image (realm, plugins, theme, truststore, JARs) consumed by UDS…
CVE-2026-10611 — Critical (CVSS 10.0): An authentication bypass vulnerability exists in MISP when LDAP mixed authentication is enabled with OTP enforcement.…
CVE-2026-47280 — Critical (CVSS 10.0): Improper authentication in Azure Resource Manager (ARM) allows an unauthorized attacker to elevate privileges over a…
CVE-2026-42822 — Critical (CVSS 10.0): Improper authentication in Azure Local Disconnected Operations allows an unauthorized attacker to elevate privileges…
CVE-2026-20182 — Critical (CVSS 10.0): May 2026: This security advisory provides the details and fix information for a vulnerability that was discovered and…

Browse all CWE-287 (Improper Authentication) vulnerabilities →