# CVE-2026-48119: Nezha Monitoring: Authenticated agents can forge service-monitor results for other users' services

> Authenticated agents can forge service-monitor results for other users' services, allowing unauthorized data modification.

- **Severity:** High 7.1 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 12 Jun 2026
- **Updated:** 15 Jun 2026
- **Also known as:** GHSA-4g6j-g789-rghm, GO-2026-5119

## What is CVE-2026-48119?

CVE-2026-48119 is a high-severity missing authorization vulnerability in nezhahq nezha, published on 12 Jun 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

Nezha Monitoring is a self-hostable, lightweight, servers and websites monitoring and O&M tool. From version 0.20.0 to before version 2.0.12, authenticated agents can forge service-monitor results for other users' services. This issue has been patched in version 2.0.12.

Weakness: CWE-862 (Missing Authorization)

## Which versions are affected by CVE-2026-48119?

6 open source packages ship an affected version, including github.com/nezhahq/nezha and github.com/naiba/nezha.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `github.com/nezhahq/nezha` | Go | From 0.20.0 | 1.14.15-0.20260521020202-02129f16fb15 |
| `github.com/nezhahq/nezha` | Go | From 0.20.0 | 1.14.15-0.20260521020202-02129f16fb15 |
| `github.com/nezhahq/nezha` | Go | From 1.0.0 | 1.14.15-0.20260521020202-02129f16fb15 |
| `github.com/nezhahq/nezha` | Go | From 2.0.0 | 2.0.12 |
| `github.com/nezhahq/nezha` | Go | From 2.0.0 | 2.0.12 |
| `github.com/naiba/nezha` | Go | From 0.20.0 | None |

## How do I fix CVE-2026-48119?

Upgrade github.com/nezhahq/nezha to a fixed version for your release line: 1.14.15-0.20260521020202-02129f16fb15 or 2.0.12.

## Is CVE-2026-48119 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-48119 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-48119 and fix it if it is affected.

What it is: CVE-2026-48119 is a high-severity missing authorization vulnerability in nezhahq nezha, published on 12 Jun 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-48119 exists.

Affected packages and fixed versions:
- github.com/nezhahq/nezha (Go): affected from 0.20.0; fixed in 1.14.15-0.20260521020202-02129f16fb15
- github.com/nezhahq/nezha (Go): affected from 0.20.0; fixed in 1.14.15-0.20260521020202-02129f16fb15
- github.com/nezhahq/nezha (Go): affected from 1.0.0; fixed in 1.14.15-0.20260521020202-02129f16fb15
- github.com/nezhahq/nezha (Go): affected from 2.0.0; fixed in 2.0.12
- github.com/nezhahq/nezha (Go): affected from 2.0.0; fixed in 2.0.12
- github.com/naiba/nezha (Go): affected from 0.20.0; no fix listed

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-2026-48119/ (Markdown: https://insights.sbomify.com/CVE-2026-48119/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-48119
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-48119
- OSV: https://osv.dev/vulnerability/CVE-2026-48119

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-48119/
Summaries are generated and may contain mistakes; the official description above is the record.