# CVE-2021-4164: Cross-Site Request Forgery (CSRF) in janeczku/calibre-web

> An attacker can trick authenticated users into performing unintended actions in Calibre Web via Cross-Site Request Forgery.

- **Severity:** High 7.6 (`CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:H`)
- **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:** Yes
- **Published:** 17 Jan 2022
- **Updated:** 3 Aug 2024
- **Also known as:** GHSA-wxr6-29pv-ch68, PYSEC-2026-621

## What is CVE-2021-4164?

CVE-2021-4164 is a high-severity vulnerability in janeczku/calibre-web, published on 17 Jan 2022. 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

calibre-web is vulnerable to Cross-Site Request Forgery (CSRF)

Weakness: CWE-352 (Cross-Site Request Forgery)

## Which versions are affected by CVE-2021-4164?

3 open source packages ship an affected version, including calibreweb. It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `calibreweb` | PyPI | All versions | 0.6.15 |
| `calibreweb` | PyPI | All versions | 0.6.15 |
| `calibreweb` | PyPI | All versions | 0.6.15 |

Products: Janeczku Calibre-Web.

## How do I fix CVE-2021-4164?

Upgrade calibreweb to 0.6.15 or later.

## Is CVE-2021-4164 being exploited?

There is no known exploitation of CVE-2021-4164 in the wild and no public exploit code.

## Other vulnerabilities in janeczku/calibre-web

- [CVE-2022-30765](https://insights.sbomify.com/CVE-2022-30765/): SQL injection in calibreweb (critical 9.8)
- [CVE-2020-12627](https://insights.sbomify.com/CVE-2020-12627/): Hardcoded credentials in n/a (critical 9.8)
- [CVE-2022-0990](https://insights.sbomify.com/CVE-2022-0990/): Server-Side Request Forgery (SSRF) in janeczku/calibre-web (critical 9.3)
- [CVE-2022-0767](https://insights.sbomify.com/CVE-2022-0767/): Server-Side Request Forgery (SSRF) in janeczku/calibre-web (critical 9.1)
- [CVE-2022-0939](https://insights.sbomify.com/CVE-2022-0939/): Server-Side Request Forgery (SSRF) in janeczku/calibre-web (critical 9.0)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-4164 and fix it if it is affected.

What it is: CVE-2021-4164 is a high-severity vulnerability in janeczku/calibre-web, published on 17 Jan 2022. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2021-4164 in the wild and no public exploit code.

Affected packages and fixed versions:
- calibreweb (PyPI): affected all versions; fixed in 0.6.15
- calibreweb (PyPI): affected all versions; fixed in 0.6.15
- calibreweb (PyPI): affected all versions; fixed in 0.6.15

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-2021-4164/ (Markdown: https://insights.sbomify.com/CVE-2021-4164/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-4164
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-4164
- OSV: https://osv.dev/vulnerability/CVE-2021-4164

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-4164/
Summaries are generated and may contain mistakes; the official description above is the record.