# CVE-2026-80350: OneUptime before 12.0.7 Server-Side Request Forgery via IPv4-Mapped IPv6 Webhook URL

> Authenticated users can bypass SSRF protections using IPv4-mapped IPv6 addresses to access internal services and read responses.

- **Severity:** High 7.1 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 26 Aug 2026
- **Updated:** 29 Aug 2026
- **Also known as:** GHSA-7f26-9454-6r96, GHSA-9g3w-r349-3vvw

## What is CVE-2026-80350?

CVE-2026-80350 is a high-severity server-side request forgery vulnerability in OneUptime, published on 26 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

OneUptime's webhook target check rejects private and loopback addresses given in IPv4 form and a small set of IPv6 forms, but has no case for the IPv4-mapped IPv6 range. The webhook delivery path calls SSRFProtection.validateWebhookTargetIsSafe, and the host-literal screening inside Common/Server/Utils/SSRFProtection.ts, performed by isBlockedHostnameLiteral, rejects private and loopback IPv4 ranges and tests an IPv6 value against the unspecified address, the loopback, the link-local prefix and the unique-local prefixes. A value such as [::ffff:127.0.0.1] matches none of them. The value is also recognised as an address literal rather than a name, so the path that re-checks addresses obtained from resolution is not taken. The HTTP client treats the mapped form as the embedded IPv4 address and connects to it, so an authenticated project member who can configure a webhook can direct the server at loopback services, private network ranges and link-local metadata endpoints, and the response is recorded where the webhook result can be read. Version 12.0.7 adds handling for the mapped range.

Weakness: CWE-918 (Server-Side Request Forgery)

## Which versions are affected by CVE-2026-80350?


## How do I fix CVE-2026-80350?

No fix has been published for CVE-2026-80350 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-80350 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-80350 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-80350 and fix it if it is affected.

What it is: CVE-2026-80350 is a high-severity server-side request forgery vulnerability in OneUptime, published on 26 Aug 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-2026-80350 exists.

Affected product: OneUptime. 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-2026-80350/ (Markdown: https://insights.sbomify.com/CVE-2026-80350/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-80350
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-80350
- OSV: https://osv.dev/vulnerability/CVE-2026-80350

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-80350/
Summaries are generated and may contain mistakes; the official description above is the record.