# CVE-2025-47784: Emlog vulnerable to Deserialization of Untrusted Data

> Attackers can cause denial of service in Emlog by crafting a nickname that breaks deserialization logic, requiring a patch to fix.

- **Severity:** Medium 6.6 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:U`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 15 May 2025
- **Updated:** 16 May 2025
- **Also known as:** GHSA-f56g-m99v-mqc3

## What is CVE-2025-47784?

CVE-2025-47784 is a medium-severity unsafe deserialization vulnerability in Emlog Emlog, published on 15 May 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Emlog is an open source website building system. Versions 2.5.13 and prior have a deserialization vulnerability. A user who creates a carefully crafted nickname can cause `str_replace` to replace the value of `name_orig` with empty, causing deserialization to fail and return `false`. Commit 9643250802188b791419e3c2188577073256a8a2 fixes the issue.

Weakness: CWE-502 (Deserialization of Untrusted Data)

## Which versions are affected by CVE-2025-47784?

It affects 1 product.


Products: Emlog Emlog.

## How do I fix CVE-2025-47784?

No fix has been published for CVE-2025-47784 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-47784 being exploited?

There is no known exploitation of CVE-2025-47784 in the wild and no public exploit code.

## Other vulnerabilities in Emlog Emlog

- [CVE-2025-29401](https://insights.sbomify.com/CVE-2025-29401/): File upload in n/a (critical 9.8)
- [CVE-2025-25783](https://insights.sbomify.com/CVE-2025-25783/): File upload in n/a (critical 9.8)
- [CVE-2023-44973](https://insights.sbomify.com/CVE-2023-44973/): File upload in n/a (critical 9.8)
- [CVE-2023-44974](https://insights.sbomify.com/CVE-2023-44974/): File upload in n/a (critical 9.8)
- [CVE-2023-43291](https://insights.sbomify.com/CVE-2023-43291/): Deserialization in n/a (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-47784 and fix it if it is affected.

What it is: CVE-2025-47784 is a medium-severity unsafe deserialization vulnerability in Emlog Emlog, published on 15 May 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2025-47784 in the wild and no public exploit code.

Affected product: Emlog Emlog. 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-2025-47784/ (Markdown: https://insights.sbomify.com/CVE-2025-47784/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-47784
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-47784
- OSV: https://osv.dev/vulnerability/CVE-2025-47784

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-47784/
Summaries are generated and may contain mistakes; the official description above is the record.