CVE-2025-3986: A vulnerability was found in Apereo CAS 5.2.6

Routine

MEDIUM 4.3DOWNGRADE

CVE-2025-3986 is a medium-severity flaw (CVSS 4.3) affecting central authentication service. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A vulnerability was found in Apereo CAS 5.2.6. It has been declared as problematic. This vulnerability affects unknown code of the file cas-5.2.6\core\cas-server-core-configuration-metadata-repository\src\main\java\org\apereo\cas\metadata\rest\CasConfigurationMetadataServerController.java. The manipulation of the argument Name leads to inefficient regular expression complexity. The attack can be initiated remotely. The exploit has been disclosed

Why this priority

No elevated risk signals yet

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	4.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.7% (top 49%)
CISA exploited list	No
Weakness	CWE-400, CWE-1333
Published	2025-04-27
Last modified	2026-06-17

Publisher (CNA): VulDB · Vendor: apereo

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-04-27 21:15 UTCPublished CVE record published
2026-06-17 09:21 UTCUpdated Record last modified

apereo central authentication service DOWNGRADE

Affected: 5.2.6

Fixed in: no fixed release known

Safe to downgrade to: a release before 5.2.6

1. Check installed version

apt-cache policy central-authentication-service || rpm -q central-authentication-service || central-authentication-service --version

2. No fixed release: DOWNGRADE to a release before 5.2.6 (Debian / Ubuntu)

apt-cache madison central-authentication-service sudo apt install central-authentication-service=<VERSION_BEFORE_5.2.6> sudo apt-mark hold central-authentication-service

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list central-authentication-service sudo dnf downgrade central-authentication-service-<VERSION_BEFORE_5.2.6> sudo dnf versionlock add central-authentication-service

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2025-3986?

central authentication service: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2025-3986 being exploited?

CVE-2025-3986 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2025-3986 affect?

CVE-2025-3986 affects central authentication service. Severity is medium (CVSS 4.3). A vulnerability was found in Apereo CAS 5.2.6. It has been declared as problematic. This vulnerability affects unknown code of the file cas-5.2.6\core\cas-server-core-configuration-metadata-repository\src\main\java\org\apereo\cas\metadata\r

How urgent is CVE-2025-3986?

Priority 28/100. No elevated risk signals yet.

Software pages

Java vulnerabilities

Related CVEs

CVE-2025-3985 LOW 2.7 DOWNGRADE A vulnerability was found in Apereo CAS 5.2.6
CVE-2025-3984 MEDIUM 5.0 DOWNGRADE A vulnerability was found in Apereo CAS 5.2.6 and classified as critical
CVE-2024-4399 CRITICAL 9.1 MITIGATE The does not validate a parameter before making a request to it, which could allow unauthenticated users to p
CVE-2024-11209 MEDIUM 6.3 DOWNGRADE A vulnerability was found in Apereo CAS 6.6
CVE-2024-11208 LOW 3.7 DOWNGRADE A vulnerability was found in Apereo CAS 6.6 and classified as problematic

References

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