# CVE-2025-7453: saltbo zpan JSON Web Token token.go NewToken hard-coded password

> Attackers can bypass authentication in the zpan Go library due to a hard-coded password in the JWT token generation function.

- **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:** Yes
- **Published:** 11 Jul 2025
- **Updated:** 11 Jul 2025
- **Also known as:** GHSA-2hfh-94w5-wxvf, GO-2026-6014

## What is CVE-2025-7453?

CVE-2025-7453 is a medium-severity vulnerability in saltbo zpan, published on 11 Jul 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A vulnerability was found in saltbo zpan up to 1.6.5/1.7.0-beta2. It has been rated as problematic. This issue affects the function NewToken of the file zpan/internal/app/service/token.go of the component JSON Web Token Handler. The manipulation with the input 123 leads to use of hard-coded password. The attack may be initiated remotely. The complexity of an attack is rather high. The exploitation is known to be difficult. The exploit has been disclosed to the public and may be used.

Weakness: CWE-259 (Use of Hard-coded Password), CWE-255

## Which versions are affected by CVE-2025-7453?

3 open source packages ship an affected version, including github.com/saltbo/zpan.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `github.com/saltbo/zpan` | Go | All versions | 1.6.6 |
| `github.com/saltbo/zpan` | Go | All versions | 1.6.6 |
| `github.com/saltbo/zpan` | Go | All versions | 1.6.6 |

## How do I fix CVE-2025-7453?

Upgrade github.com/saltbo/zpan to 1.6.6 or later.

## Is CVE-2025-7453 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-7453 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-7453 and fix it if it is affected.

What it is: CVE-2025-7453 is a medium-severity vulnerability in saltbo zpan, published on 11 Jul 2025. 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-2025-7453 exists.

Affected packages and fixed versions:
- github.com/saltbo/zpan (Go): affected all versions; fixed in 1.6.6
- github.com/saltbo/zpan (Go): affected all versions; fixed in 1.6.6
- github.com/saltbo/zpan (Go): affected all versions; fixed in 1.6.6

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-2025-7453/ (Markdown: https://insights.sbomify.com/CVE-2025-7453/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-7453
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-7453
- OSV: https://osv.dev/vulnerability/CVE-2025-7453

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-7453/
Summaries are generated and may contain mistakes; the official description above is the record.