# PrivateBin has reflected JSON injection in backend responses via unescaped REQUEST_URI

Advisory record · `GHSA-xrjc-c68j-hp7w`

- **Identifiers:** `GHSA-xrjc-c68j-hp7w` · `CVE-2026-55891` · `PKSA-t55m-4nf3-277t`
- **State:** Confirmed
- **Severity:** CVSS 0.0 None
- **Critical:** No
- **Weakness (CWE):** [CWE-116](https://cwe.mitre.org/data/definitions/116.html)
- **Tags:** [CWE-116](https://agentprime.io/advisories/tag/cwe-116.md)
- **Published:** 28 Aug 2026
- **Updated:** 28 Aug 2026
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 28 Aug 2026, 20:25 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `privatebin/privatebin` (Packagist): affected `<2.0.5`; fixed in `2.0.5`

## Machine-written summary

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

> PrivateBin versions before 2.0.5 (Packagist privatebin/privatebin) reflect the request URI unescaped into JSON-LD responses, allowing reflected JSON injection. An unauthenticated attacker can craft a request containing quote characters so that arbitrary keys and values appear in the JSON response, which is served with cross-origin access open and without the X-Content-Type-Options header on that path. The source says no direct script execution was demonstrated; upgrade to version 2.0.5, which contains the fix.

Written 31 Oct 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

- 0.0 None, CVSS 3.1: `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:N`, from CNA (GitHub_M)

- **CISA KEV:** Not listed.
- **EPSS:** 0.0054, the 45th percentile, on 6 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

- 31 Oct 2026, 14:06 UTC: First seen by agentprime
- 31 Oct 2026, 14:06 UTC: [Confirmed by OSV](https://osv.dev/vulnerability/GHSA-xrjc-c68j-hp7w)

## Sources

- [GitHub Advisory Database: GHSA-xrjc-c68j-hp7w](https://github.com/advisories/GHSA-xrjc-c68j-hp7w)
- [OSV: GHSA-xrjc-c68j-hp7w](https://osv.dev/vulnerability/GHSA-xrjc-c68j-hp7w)
- <https://github.com/PrivateBin/PrivateBin/security/advisories/GHSA-xrjc-c68j-hp7w>
- <https://github.com/PrivateBin/PrivateBin/commit/75f056dcda955d94c17ec5a4f8c54a9b7bfcee07>
- <https://github.com/PrivateBin/PrivateBin>
- <https://github.com/PrivateBin/PrivateBin/releases/tag/2.0.5>

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-xrjc-c68j-hp7w>, 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-xrjc-c68j-hp7w/>. Everything for agents: <https://agentprime.io/llms.txt>.