CVE-2023-25402: CleverStupidDog yf-exam 1.8.0 is vulnerable to File Upload

This week

HIGH 7.5REMOTEDOWNGRADE

CVE-2023-25402 is a high-severity flaw (CVSS 7.5) affecting yf-exam. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

CleverStupidDog yf-exam 1.8.0 is vulnerable to File Upload. There is no restriction on the suffix of the uploaded file, resulting in any file upload.

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	0.6% (top 52%)
CISA exploited list	No
Weakness	CWE-434
Published	2023-03-03
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: yf-exam project

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

Am I affected?

Timeline

2023-03-03 23:15 UTCPublished CVE record published
2026-06-17 05:41 UTCUpdated Record last modified

yf-exam project yf-exam DOWNGRADE

Affected: 1.8.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.8.0

1. Check installed version

apt-cache policy yf-exam || rpm -q yf-exam || yf-exam --version

2. No fixed release: DOWNGRADE to a release before 1.8.0 (Debian / Ubuntu)

apt-cache madison yf-exam sudo apt install yf-exam=<VERSION_BEFORE_1.8.0> sudo apt-mark hold yf-exam

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

dnf --showduplicates list yf-exam sudo dnf downgrade yf-exam-<VERSION_BEFORE_1.8.0> sudo dnf versionlock add yf-exam

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-2023-25402?

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

Is CVE-2023-25402 being exploited?

CVE-2023-25402 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-2023-25402 affect?

CVE-2023-25402 affects yf-exam. Severity is high (CVSS 7.5). CleverStupidDog yf-exam 1.8.0 is vulnerable to File Upload. There is no restriction on the suffix of the uploaded file, resulting in any file upload.

How urgent is CVE-2023-25402?

Priority 48/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

Related CVEs

CVE-2023-26779 CRITICAL 9.8 DOWNGRADE CleverStupidDog yf-exam v 1.8.0 is vulnerable to Deserialization which can lead to remote code execution (RCE)
CVE-2023-25403 HIGH 7.5 DOWNGRADE CleverStupidDog yf-exam v 1.8.0 is vulnerable to Authentication Bypass

References

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