How severe is CVE-2023-25403?

CVE-2023-25403 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability none.

Is CVE-2023-25403 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (47th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-25403?

CVE-2023-25403 affects Yf-exam Project Yf-exam. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2023-25403?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2023-25403 published?

CVE-2023-25403 was published on 2023-03-03 and last updated on 2026-06-17.

CVE-2023-25403

CVE-2023-25403 is a high-severity vulnerability in Yf-exam Project Yf-exam with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-639.

Key facts

Severity: High (CVSS 3.x base score 7.5)
EPSS exploit prediction: 1% (47th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-639
Affected product: Yf-exam Project Yf-exam
Published: 2023-03-03
Last modified: 2026-06-17

Description

CleverStupidDog yf-exam v 1.8.0 is vulnerable to Authentication Bypass. The program uses a fixed JWT key, and the stored key uses username format characters. Any user who logged in within 24 hours. A token can be forged with his username to bypass authentication.

Frequently asked questions

What is CVE-2023-25403?: CleverStupidDog yf-exam v 1.8.0 is vulnerable to Authentication Bypass. The program uses a fixed JWT key, and the stored key uses username format characters. Any user who logged in within 24 hours. A token can be forged with his username to bypass authentication.
How severe is CVE-2023-25403?: CVE-2023-25403 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability none.
Is CVE-2023-25403 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (47th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-25403?: CVE-2023-25403 affects Yf-exam Project Yf-exam. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2023-25403?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2023-25403 published?: CVE-2023-25403 was published on 2023-03-03 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:yf-exam_project:yf-exam:1.8.0:*:*:*:*:*:*:*

More vulnerabilities in Yf-exam Project Yf-exam

CVE-2023-26779 — Critical (CVSS 9.8): CleverStupidDog yf-exam v 1.8.0 is vulnerable to Deserialization which can lead to remote code execution (RCE).
CVE-2023-26780 — Critical (CVSS 9.8): CleverStupidDog yf-exam v 1.8.0 is vulnerable to SQL Injection.
CVE-2023-25402 — 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,…

All CVEs affecting Yf-exam Project Yf-exam →

Other CWE-639 (Authorization Bypass Through User-Controlled Key (IDOR)) vulnerabilities

CVE-2025-40805 — Critical (CVSS 10.0): Affected devices do not properly enforce user authentication on specific API endpoints. This could facilitate an…
CVE-2024-45032 — Critical (CVSS 10.0): A vulnerability has been identified in Industrial Edge Management Pro (All versions < V1.9.5), Industrial Edge…
CVE-2026-34037 — Critical (CVSS 9.9): Coolify is an open-source and self-hostable tool for managing servers, applications, and databases. Prior to…
CVE-2026-52782 — Critical (CVSS 9.9): OpenProject is open-source, web-based project management software. Prior to 17.3.3 and 17.4.1, there is an IDOR through…
CVE-2026-45552 — Critical (CVSS 9.9): Roxy-WI is a web interface for managing Haproxy, Nginx, Apache and Keepalived servers. In versions 8.2.6.4 and prior,…
CVE-2026-29200 — Critical (CVSS 9.9): A critical IDOR vulnerability has been discovered in Comet Backup affecting all versions from 20.11.0 to 26.1.1 and…

Browse all CWE-639 (Authorization Bypass Through User-Controlled Key (IDOR)) vulnerabilities →