# CVE-2026-7709: janeczku Calibre-Web Endpoint kobo_auth.py generate_auth_token improper authorization

> Remote attackers can exploit improper authorization in Calibre-Web's Kobo auth token generation to escalate privileges or take over accounts.

- **Severity:** Medium 5.3 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P`)
- **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:** 3 May 2026
- **Updated:** 4 May 2026
- **Also known as:** GHSA-6xgw-x2hr-63c2

## What is CVE-2026-7709?

CVE-2026-7709 is a medium-severity missing authorization vulnerability in janeczku Calibre-Web, published on 3 May 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

A vulnerability was identified in janeczku Calibre-Web up to 0.6.26. The impacted element is the function generate_auth_token of the file cps/kobo_auth.py of the component Endpoint. Such manipulation of the argument user_id leads to improper authorization. The attack may be launched remotely. The exploit is publicly available and might be used. The vendor was contacted early about this disclosure but did not respond in any way.

Weakness: CWE-285 (Improper Authorization), CWE-266 (Incorrect Privilege Assignment)

## Which versions are affected by CVE-2026-7709?


## How do I fix CVE-2026-7709?

No fix has been published for CVE-2026-7709 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-7709 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-7709 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-7709 and fix it if it is affected.

What it is: CVE-2026-7709 is a medium-severity missing authorization vulnerability in janeczku Calibre-Web, published on 3 May 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-2026-7709 exists.

Affected product: janeczku Calibre-Web. 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-2026-7709/ (Markdown: https://insights.sbomify.com/CVE-2026-7709/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-7709
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-7709
- OSV: https://osv.dev/vulnerability/CVE-2026-7709

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-7709/
Summaries are generated and may contain mistakes; the official description above is the record.