CVE-2025-66480: Wildfire IM is an instant messaging and real-time audio/video solution

Q: How do I fix CVE-2025-66480?

im-server: upgrade to 1.4.3. Exact commands for each OS are on this page.

Q: Is CVE-2025-66480 being exploited?

CVE-2025-66480 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2025-66480 affect?

CVE-2025-66480 affects im-server. Severity is critical (CVSS 9.8). Wildfire IM is an instant messaging and real-time audio/video solution. Prior to 1.4.3, a critical vulnerability exists in the im-server component related to the file upload functionality found in com.xiaoleilu.loServer.action.UploadFileAct

Q: How urgent is CVE-2025-66480?

Priority 61/100. Critical severity; CISA SSVC: automatable with total technical impact; Remotely exploitable, no login, no user action

This week

CRITICAL 9.8REMOTEUPGRADE

CVE-2025-66480 is a critical-severity flaw (CVSS 9.8) affecting im-server. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Wildfire IM is an instant messaging and real-time audio/video solution. Prior to 1.4.3, a critical vulnerability exists in the im-server component related to the file upload functionality found in com.xiaoleilu.loServer.action.UploadFileAction. The application exposes an endpoint (/fs) that handles multipart file uploads but fails to properly sanitize the filename provided by the user. Specifically, the writeFileUploadData method directly concate

Why this priority

Critical severity
CISA SSVC: automatable with total technical impact
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.5% (top 25%)
CISA exploited list	No
Weakness	CWE-22, CWE-434
Published	2026-02-02
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: wildfirechat

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

Am I affected?

Timeline

2026-02-02 23:16 UTCPublished CVE record published
2026-06-17 09:56 UTCUpdated Record last modified

wildfirechat im-server UPGRADE

Affected: < 1.4.3

Fixed in: 1.4.3

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy im-server || rpm -q im-server || im-server --version

2. UPGRADE to 1.4.3 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade im-server

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade im-server

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Exact fixes by distribution

Fedora 46 · proftpd · FIXED · 1.3.9e-2.fc46 · FEDORA-2026-fcb0a25c2f · source

sudo dnf upgrade --advisory=FEDORA-2026-fcb0a25c2f

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-2025-66480?

im-server: upgrade to 1.4.3. Exact commands for each OS are on this page.

Is CVE-2025-66480 being exploited?

CVE-2025-66480 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-2025-66480 affect?

CVE-2025-66480 affects im-server. Severity is critical (CVSS 9.8). Wildfire IM is an instant messaging and real-time audio/video solution. Prior to 1.4.3, a critical vulnerability exists in the im-server component related to the file upload functionality found in com.xiaoleilu.loServer.action.UploadFileAct

How urgent is CVE-2025-66480?

Priority 61/100. Critical severity; CISA SSVC: automatable with total technical impact; Remotely exploitable, no login, no user action

References

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