# CVE-2026-105156: YzmCMS MD5 system.func.php password weak password hash

> Attackers can crack user passwords due to weak MD5 hashing in YzmCMS, requiring high complexity but enabling credential theft.

- **Severity:** Medium 6.3 (`CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:P`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 4 Oct 2026
- **Updated:** 5 Oct 2026
- **Also known as:** GHSA-h259-j8qc-grcv

## What is CVE-2026-105156?

CVE-2026-105156 is a medium-severity vulnerability in YzmCMS, published on 4 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A weakness has been identified in YzmCMS up to 7.6. Impacted is the function Password of the file /common/function/system.func.php of the component MD5 Handler. Executing a manipulation of the argument pass can lead to password hash with insufficient computational effort. The attack may be launched remotely. This attack is characterized by high complexity. The exploitability is considered difficult. The exploit has been made available to the public and could be used for attacks. The vendor kindly explains: "Our regular release cycle is about 6 months. The last release was in the previous month, and our next scheduled version will be released in March 2027. We will implement the backward-compatible gradual hash migration feature in this upcoming release. (...) Before the new version is available, we will publish security mitigation guidance on our official documentation for existing deployers to reduce the risk."

Weakness: CWE-916 (Use of Password Hash With Insufficient Computational Effort), CWE-326 (Inadequate Encryption Strength)

## Which versions are affected by CVE-2026-105156?


## How do I fix CVE-2026-105156?

No fix has been published for CVE-2026-105156 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-105156 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-105156 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-105156 and fix it if it is affected.

What it is: CVE-2026-105156 is a medium-severity vulnerability in YzmCMS, published on 4 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-105156 exists.

Affected product: YzmCMS. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-105156/ (Markdown: https://insights.sbomify.com/CVE-2026-105156/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-105156
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-105156
- OSV: https://osv.dev/vulnerability/CVE-2026-105156

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-105156/
Summaries are generated and may contain mistakes; the official description above is the record.