CVE-2025-66735: youlai-boot V2.21.1 is vulnerable to Incorrect Access Control

This week

HIGH 7.5REMOTEDOWNGRADE

CVE-2025-66735 is a high-severity flaw (CVSS 7.5) affecting youlai-boot. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

youlai-boot V2.21.1 is vulnerable to Incorrect Access Control. The getRoleForm function in SysRoleController.java does not perform permission checks, which may allow non-root users to directly access root roles.

Why this priority

High severity
Public exploit reference
Remotely exploitable, no login, no user action

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

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.4% (top 62%)
CISA exploited list	No
Weakness	CWE-284, CWE-862
Published	2025-12-22
Last modified	2026-10-26

Publisher (CNA): MITRE · Vendor: youlai

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-12-22 21:15 UTCPublished CVE record published
2026-10-26 21:10 UTCUpdated Record last modified

youlai youlai-boot DOWNGRADE

Affected: 2.21.1

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.21.1

1. Check installed version

apt-cache policy youlai-boot || rpm -q youlai-boot || youlai-boot --version

2. No fixed release: DOWNGRADE to a release before 2.21.1 (Debian / Ubuntu)

apt-cache madison youlai-boot sudo apt install youlai-boot=<VERSION_BEFORE_2.21.1> sudo apt-mark hold youlai-boot

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

dnf --showduplicates list youlai-boot sudo dnf downgrade youlai-boot-<VERSION_BEFORE_2.21.1> sudo dnf versionlock add youlai-boot

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-2025-66735?

youlai-boot: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2025-66735 being exploited?

CVE-2025-66735 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-2025-66735 affect?

CVE-2025-66735 affects youlai-boot. Severity is high (CVSS 7.5). youlai-boot V2.21.1 is vulnerable to Incorrect Access Control. The getRoleForm function in SysRoleController.java does not perform permission checks, which may allow non-root users to directly access root roles.

How urgent is CVE-2025-66735?

Priority 46/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

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References

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