# CVE-2017-20174: bastianallgeier Kirby Webmentions Plugin injection

> Remote attackers can exploit an injection flaw in the Kirby Webmentions Plugin to execute arbitrary code, requiring a patch for mitigation.

- **Severity:** Medium 5.6 (`CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 19 Jan 2023
- **Updated:** 3 Apr 2025
- **Also known as:** GHSA-p2v8-f859-pvgv

## What is CVE-2017-20174?

CVE-2017-20174 is a medium-severity code injection vulnerability in bastianallgeier Kirby Webmentions Plugin, published on 19 Jan 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A vulnerability was found in bastianallgeier Kirby Webmentions Plugin and classified as problematic. Affected by this issue is some unknown functionality. The manipulation leads to injection. The attack may be launched remotely. The complexity of an attack is rather high. The exploitation is known to be difficult. The patch is identified as 55bedea78ae9af916a9a41497bd9996417851502. It is recommended to apply a patch to fix this issue. VDB-218894 is the identifier assigned to this vulnerability.

Weakness: CWE-74 (Improper Neutralization of Special Elements in Output Used by a Downstream Component)

## Which versions are affected by CVE-2017-20174?

It affects 1 product.


Products: Getkirby Webmentions.

## How do I fix CVE-2017-20174?

No fix has been published for CVE-2017-20174 yet. Limit exposure of the affected software until one is available.

## Is CVE-2017-20174 being exploited?

There is no known exploitation of CVE-2017-20174 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2017-20174 and fix it if it is affected.

What it is: CVE-2017-20174 is a medium-severity code injection vulnerability in bastianallgeier Kirby Webmentions Plugin, published on 19 Jan 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2017-20174 in the wild and no public exploit code.

Affected product: bastianallgeier Kirby Webmentions Plugin. 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-2017-20174/ (Markdown: https://insights.sbomify.com/CVE-2017-20174/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2017-20174
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2017-20174
- OSV: https://osv.dev/vulnerability/CVE-2017-20174

---
From sbomify Insights: https://insights.sbomify.com/CVE-2017-20174/
Summaries are generated and may contain mistakes; the official description above is the record.