# CVE-2026-12517: Fediverse Embeds < 1.5.8 - Unauthenticated SSRF via Site Info Endpoint

> Unauthenticated attackers can exploit an SSRF vulnerability in the Fediverse Embeds WordPress plugin to access internal network resources and read metadata.

- **Severity:** Medium 5.3 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 9 Jul 2026
- **Updated:** 9 Jul 2026
- **Also known as:** GHSA-9x4j-8g3j-786h

## What is CVE-2026-12517?

CVE-2026-12517 is a medium-severity server-side request forgery vulnerability in Unknown Fediverse Embeds, published on 9 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

The Fediverse Embeds WordPress plugin before 1.5.8 does not validate the destination of the server-side request performed by an unauthenticated site-info endpoint before fetching it, allowing anonymous users (the gating nonce is exposed on public pages carrying an embed) to make the site request internal and private-network URLs and read back the parsed page metadata. This is a Server-Side Request Forgery.

## Which versions are affected by CVE-2026-12517?


## How do I fix CVE-2026-12517?

No fix has been published for CVE-2026-12517 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-12517 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-12517 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-12517 and fix it if it is affected.

What it is: CVE-2026-12517 is a medium-severity server-side request forgery vulnerability in Unknown Fediverse Embeds, published on 9 Jul 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-2026-12517 exists.

Affected product: Unknown Fediverse Embeds. 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-2026-12517/ (Markdown: https://insights.sbomify.com/CVE-2026-12517/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-12517
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-12517
- OSV: https://osv.dev/vulnerability/CVE-2026-12517

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-12517/
Summaries are generated and may contain mistakes; the official description above is the record.