CVE-2025-66911: Turms IM Server v0.10.0-SNAPSHOT and earlier contains a broken access control vulnerability in the user online

Routine

MEDIUM 6.5DOWNGRADE

CVE-2025-66911 is a medium-severity flaw (CVSS 6.5) affecting turms. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Turms IM Server v0.10.0-SNAPSHOT and earlier contains a broken access control vulnerability in the user online status query functionality. The handleQueryUserOnlineStatusesRequest() method in UserServiceController.java allows any authenticated user to query the online status, device information, and login timestamps of arbitrary users without proper authorization checks.

Why this priority

Public exploit reference

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

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.3% (top 74%)
CISA exploited list	No
Weakness	CWE-284, CWE-639
Published	2025-12-19
Last modified	2026-10-13

Publisher (CNA): MITRE · Vendor: turms-im

Last updated 2026-10-13 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-12-19 15:15 UTCPublished CVE record published
2026-10-13 11:10 UTCUpdated Record last modified

turms-im turms DOWNGRADE

Affected: 0.10.0-snapshot

Fixed in: no fixed release known

Safe to downgrade to: a release before 0.10.0-snapshot

1. Check installed version

apt-cache policy turms || rpm -q turms || turms --version

2. No fixed release: DOWNGRADE to a release before 0.10.0-snapshot (Debian / Ubuntu)

apt-cache madison turms sudo apt install turms=<VERSION_BEFORE_0.10.0-snapshot> sudo apt-mark hold turms

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

dnf --showduplicates list turms sudo dnf downgrade turms-<VERSION_BEFORE_0.10.0-snapshot> sudo dnf versionlock add turms

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-2025-66911?

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

Is CVE-2025-66911 being exploited?

CVE-2025-66911 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-2025-66911 affect?

CVE-2025-66911 affects turms. Severity is medium (CVSS 6.5). Turms IM Server v0.10.0-SNAPSHOT and earlier contains a broken access control vulnerability in the user online status query functionality. The handleQueryUserOnlineStatusesRequest() method in UserServiceController.java allows any authentica

How urgent is CVE-2025-66911?

Priority 34/100. Public exploit reference

Software pages

Java vulnerabilities

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References

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