Is CVE-2026-92921 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-92921 being exploited in the wild.

How severe is CVE-2026-92921?

Medium severity, with a CVSS score of 4.9, published 17 September 2026.

Which products and versions are affected?

LinYuanyi admin3 through 3.0.0.

Is there a fix for CVE-2026-92921?

No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

How is CVE-2026-92921 attacked?

It is attacked over the network, in a software library.

Am I affected by CVE-2026-92921?

Check whether anything you run is named in the advisory. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-92921: admin3 weak password hashing with single-round MD5

CVE-2026-92921 · Severity: medium · CVSS 4.9 · Published 2026-09-17

admin3 is a lightweight backend administration framework that uses a weak password hashing scheme (single-round MD5 with username as salt) to store user account credentials. An attacker who gains access to the application database can easily recover plaintext passwords through offline dictionary or brute-force attacks due to MD5's low computational cost and lack of key derivation functions.

Quick answers

Is CVE-2026-92921 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-92921 being exploited in the wild.
How severe is CVE-2026-92921?: Medium severity, with a CVSS score of 4.9, published 17 September 2026.
Which products and versions are affected?: LinYuanyi admin3 through 3.0.0.
Is there a fix for CVE-2026-92921?: No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2026-92921 attacked?: It is attacked over the network, in a software library.
Am I affected by CVE-2026-92921?: Check whether anything you run is named in the advisory. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

The vulnerability is a cryptographic weakness in password storage: admin3 uses MD5 hashing with only the username concatenated as salt (without separator) and no key derivation function or work factor. The hashing implementation also exhibits a non-canonical encoding defect (leading zeros dropped by BigInteger.toString(16)), causing roughly 6.25% of hashes to be incompatible with standard MD5 representations. An attacker with database access can perform offline password recovery attacks with negligible computational effort. The vulnerability affects versions through 3.0.0; patched versions use proper password hashing with appropriate salt and key derivation.

Affected products

LinYuanyi admin3 through 3.0.0

Timeline

2026-09-17: disclosed: CVE-2026-92921 published on NVD

References

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