# GHSA-4vf6-mq7w-3hp6: Zend_Filter_StripTags vulnerable to Cross-site Scripting when comments allowed

> Attackers can execute scripts via HTML comments in filtered text if comment whitelisting is enabled, affecting applications using Zend_Filter_StripTags.

- **Severity:** Not scored
- **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:** 7 Jun 2024

## What is GHSA-4vf6-mq7w-3hp6?

GHSA-4vf6-mq7w-3hp6 is a cross-site scripting vulnerability in zendframework/zendframework1, published on 7 Jun 2024. 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

Zend_Filter_StripTags contained an optional setting to allow whitelisting HTML comments in filtered text. Microsoft Internet Explorer and several other browsers allow developers to create conditional functionality via HTML comments, including execution of script events and rendering of additional commented markup. By allowing whitelisting of HTML comments, a malicious user could potentially include XSS exploits within HTML comments that would then be rendered in the final output.

## Which versions are affected by GHSA-4vf6-mq7w-3hp6?

6 open source packages ship an affected version, including zendframework/zendframework1.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `zendframework/zendframework1` | Packagist | From 1.7.0 | 1.7.9 |
| `zendframework/zendframework1` | Packagist | From 1.7.0 | 1.7.9 |
| `zendframework/zendframework1` | Packagist | From 1.8.0 | 1.8.5 |
| `zendframework/zendframework1` | Packagist | From 1.8.0 | 1.8.5 |
| `zendframework/zendframework1` | Packagist | From 1.9.0 | 1.9.7 |
| `zendframework/zendframework1` | Packagist | From 1.9.0 | 1.9.7 |

## How do I fix GHSA-4vf6-mq7w-3hp6?

Upgrade zendframework/zendframework1 to a fixed version for your release line: 1.7.9, 1.8.5 or 1.9.7.

## Is GHSA-4vf6-mq7w-3hp6 being exploited?

There is no known exploitation of GHSA-4vf6-mq7w-3hp6 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for GHSA-4vf6-mq7w-3hp6 and fix it if it is affected.

What it is: GHSA-4vf6-mq7w-3hp6 is a cross-site scripting vulnerability in zendframework/zendframework1, published on 7 Jun 2024. 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 GHSA-4vf6-mq7w-3hp6 in the wild and no public exploit code.

Affected packages and fixed versions:
- zendframework/zendframework1 (Packagist): affected from 1.7.0; fixed in 1.7.9
- zendframework/zendframework1 (Packagist): affected from 1.7.0; fixed in 1.7.9
- zendframework/zendframework1 (Packagist): affected from 1.8.0; fixed in 1.8.5
- zendframework/zendframework1 (Packagist): affected from 1.8.0; fixed in 1.8.5
- zendframework/zendframework1 (Packagist): affected from 1.9.0; fixed in 1.9.7
- zendframework/zendframework1 (Packagist): affected from 1.9.0; fixed in 1.9.7

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/GHSA-4vf6-mq7w-3hp6/ (Markdown: https://insights.sbomify.com/GHSA-4vf6-mq7w-3hp6/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/GHSA-4vf6-mq7w-3hp6

---
From sbomify Insights: https://insights.sbomify.com/GHSA-4vf6-mq7w-3hp6/
Summaries are generated and may contain mistakes; the official description above is the record.