# SilverStripe Web Cache Poisoning through HTTPRequestBuilder

Advisory record · `GHSA-q9ff-3q93-fm8m`

- **Identifiers:** `GHSA-q9ff-3q93-fm8m` · `CVE-2019-19326` · `PKSA-75gp-x5bj-hcwc`
- **State:** Confirmed
- **Severity:** CVSS 5.9 Medium
- **Critical:** No
- **Weakness (CWE):** [CWE-444](https://cwe.mitre.org/data/definitions/444.html)
- **Tags:** [HTTP request smuggling](https://agentprime.io/advisories/tag/request-smuggling.md)
- **Published:** 24 May 2022
- **Updated:** 22 May 2024
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 24 May 2022, 17:22 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `silverstripe/framework` (Packagist): affected `>=4.0.0, <4.4.7 || >=4.5.0, <4.5.4 || >=3.0.0, <3.7.5`; fixed in `4.4.7`, `4.5.4`, `3.7.5`

## Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

> SilverStripe framework versions 3.0.0 up to 3.7.5, 4.0.0 up to 4.4.7, and 4.5.0 up to 4.5.4 are affected by a web cache poisoning issue in HTTPRequestBuilder. The source gives few details about how the attack works. Upgrade silverstripe/framework to 3.7.5, 4.4.7, or 4.5.4, depending on your release line.

Written 4 Nov 2026.

## Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

## Severity and exploitation

- 5.9 Medium, CVSS 3.1: `CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N`, from GitHub Advisory Database

- **CISA KEV:** Not listed.
- **EPSS:** 0.0076, the 55th percentile, on 8 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

- 31 Oct 2026, 14:29 UTC: First seen by agentprime
- 31 Oct 2026, 14:29 UTC: [Confirmed by OSV](https://osv.dev/vulnerability/GHSA-q9ff-3q93-fm8m)

## Sources

- [GitHub Advisory Database: GHSA-q9ff-3q93-fm8m](https://github.com/advisories/GHSA-q9ff-3q93-fm8m)
- [OSV: GHSA-q9ff-3q93-fm8m](https://osv.dev/vulnerability/GHSA-q9ff-3q93-fm8m)
- <https://nvd.nist.gov/vuln/detail/CVE-2019-19326>
- <https://github.com/silverstripe/silverstripe-framework/commit/107706c12cd9cf4d1b8b96b6a6e223633209d851>
- <https://github.com/silverstripe/silverstripe-framework/commit/8518987cbd1eaca71b65dd4a4b35591db941509a>
- <https://github.com/silverstripe/silverstripe-framework/commit/98926e4e6c26d1d43bb1faf516d15bdb2739556e>
- <https://github.com/FriendsOfPHP/security-advisories/blob/master/silverstripe/framework/CVE-2019-19326.yaml>
- <https://github.com/silverstripe/silverstripe-framework>
- <https://www.silverstripe.org/download/security-releases/CVE-2019-19326>

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.

## Check whether this affects you

A Match means an installed version is in the affected range above. Most don’t affect the app; agentprime hasn’t analysed this one yet.

- With the agentprime MCP server (<https://api.agentprime.io/mcp>), ask your agent to check the project: `check_lockfile` sends a lockfile, `check_packages` a list of installed packages, and both return the Matches and the upgrades that clear them. `get_advisory` returns this record. Setup: <https://agentprime.io/mcp.md>
- In a browser: <https://agentprime.io/check/> reads your lockfile in the browser, never uploading it.
- Whether it touches your code, with file and line: the Claude Code plugin, <https://agentprime.io/plugin.md>
- As JSON: <https://api.agentprime.io/v1/advisories/GHSA-q9ff-3q93-fm8m>, or `POST https://api.agentprime.io/v1/match` with your packages (<https://agentprime.io/api.md>)

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The web page: <https://agentprime.io/advisories/GHSA-q9ff-3q93-fm8m/>. Everything for agents: <https://agentprime.io/llms.txt>.