# CVE-2026-86196: Grav API Plugin before 1.0.20 Authentication Bypass via Host Header

> Unauthenticated attackers can hijack password reset tokens via Host header manipulation to take over accounts, including super-admins.

- **Severity:** High 8.7 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 5 Sep 2026
- **Updated:** 8 Sep 2026
- **Also known as:** GHSA-gg9g-7x93-5gq2

## What is CVE-2026-86196?

CVE-2026-86196 is a high-severity vulnerability in getgrav grav-plugin-api, published on 5 Sep 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### Official description

Grav API plugin versions before 1.0.20 build password reset links from the untrusted Host header in the forgot-password endpoint, allowing unauthenticated attackers to redirect reset tokens to attacker-controlled domains. Attackers can send password reset requests for any account with a malicious Host header, intercept the reset token from victim emails, and complete account takeover including super-admin accounts.

Weakness: CWE-290 (Authentication Bypass by Spoofing)

## Which versions are affected by CVE-2026-86196?


## How do I fix CVE-2026-86196?

No fix has been published for CVE-2026-86196 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-86196 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-86196 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-86196 and fix it if it is affected.

What it is: CVE-2026-86196 is a high-severity vulnerability in getgrav grav-plugin-api, published on 5 Sep 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-86196 exists.

Affected product: getgrav grav-plugin-api. 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-2026-86196/ (Markdown: https://insights.sbomify.com/CVE-2026-86196/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-86196
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-86196
- OSV: https://osv.dev/vulnerability/CVE-2026-86196

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-86196/
Summaries are generated and may contain mistakes; the official description above is the record.