Skip to content
Patch Next
Sign inAdd to your agent

← Actionable
Unratedamended

PrivateBin has reflected JSON injection in backend responses via unescaped REQUEST_URI

CVE-2026-55891GHSA-xrjc-c68j-hp7w

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (privatebin/privatebin 2.0.5), redeploy, then verify what is actually installed.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

Add to your agent

Affected packages

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS
0.0 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:N
EPSS
  • CVE-2026-55891: 0.54% estimated exploitation activity in the next 30 days; percentile 45.42 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.
Source description

As published by the source; long descriptions are shortened.

Vulnerability Details A reflected JSON injection allows an attacker to return arbitrary data in the JSON endpoints (like /?jsonld= and /?pasteid). Root Cause Request::getRequestUri() sanitizes $SERVER['REQUESTURI'] with FILTERSANITIZEURL: FILTERSANITIZEURL does not strip ", ', <, characters (per the PHP manual's allowed-character list for this filter). So the raw, attacker-controlled request URI (including query string) passes through almost unmodified into Controller::$urlBase (set in init()). In Controller::jsonld(), $urlBase is spliced directly into one of the static .jsonld templates (js/types.jsonld, js/paste.jsonld, etc.) with a plain strreplace(), without any JSON-escaping: A request URI containing a literal " therefore breaks out of the JSON string in the "@context"."pb" value and injects arbitrary attacker-controlled key/value pairs into the response body, which is served with Content-Type: application/ld+json and Access-Control-Allow-Origin: . Additionally, the jsonld case…

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 2 · amended ·

    Amended from ghsa record GHSA-xrjc-c68j-hp7w

  2. Revision 1 · created ·

    Published from osv record GHSA-xrjc-c68j-hp7w

Agent brief

Preview the exact text before you copy it. Commands are read-only suggestions; review them before running anything.

# Patch Next advisory brief: CVE-2026-55891

Advisory: PrivateBin has reflected JSON injection in backend responses via unescaped REQUEST_URI
IDs: CVE-2026-55891, GHSA-xrjc-c68j-hp7w
Record: https://patchnext.com/advisories/cve-2026-55891 (revision 2, source checked 26 Oct 2026, 14:50 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Unrated (CVSS 0.0)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: privatebin/privatebin 2.0.5. A vendor fix does not mean a deployment is fixed.

## Affected components
- Packagist privatebin/privatebin: affected <= 2.0.4; fixed in 2.0.5

## Suggested inspection (read-only)
- Packagist privatebin/privatebin: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on privatebin/privatebin.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://osv.dev/vulnerability/GHSA-xrjc-c68j-hp7w (OSV record GHSA-xrjc-c68j-hp7w lists affected ranges: Packagist privatebin/privatebin >=0 <2.0.5 (fixed))
- Verified: https://github.com/advisories/GHSA-xrjc-c68j-hp7w (GitHub-reviewed advisory GHSA-xrjc-c68j-hp7w lists affected ranges: Packagist privatebin/privatebin >=0 <=2.0.4)

Commands are suggestions: review each one before running it.

Loading voting…