CVE-2025-56263: by-night sms V1.0 has an Arbitrary File Upload vulnerability

This month

HIGH 8.8DOWNGRADE

CVE-2025-56263 is a high-severity flaw (CVSS 8.8) affecting sms. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

by-night sms V1.0 has an Arbitrary File Upload vulnerability. The /api/sms/upload/headImg endpoint allows uploading arbitrary files. Users can upload files of any size and type.

Why this priority

High severity
Public exploit reference

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

Risk facts

CVSS score	8.8 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.4% (top 65%)
CISA exploited list	No
Weakness	CWE-434
Published	2025-09-16
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: by-night

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

Am I affected?

Timeline

2025-09-16 20:15 UTCPublished CVE record published
2026-06-17 09:42 UTCUpdated Record last modified

by-night sms DOWNGRADE

Affected: 1.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.0

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 1.0 (Debian / Ubuntu)

apt-cache madison sms sudo apt install sms=<VERSION_BEFORE_1.0> sudo apt-mark hold sms

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

dnf --showduplicates list sms sudo dnf downgrade sms-<VERSION_BEFORE_1.0> sudo dnf versionlock add sms

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-2025-56263?

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

Is CVE-2025-56263 being exploited?

CVE-2025-56263 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-2025-56263 affect?

CVE-2025-56263 affects sms. Severity is high (CVSS 8.8). by-night sms V1.0 has an Arbitrary File Upload vulnerability. The /api/sms/upload/headImg endpoint allows uploading arbitrary files. Users can upload files of any size and type.

How urgent is CVE-2025-56263?

Priority 45/100. High severity; Public exploit reference

References

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