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Advisory record · GHSA-xrjc-c68j-hp7w

PrivateBin has reflected JSON injection in backend responses via unescaped REQUEST_URI

CVSS 0.0 NoneEPSS 0.0054 · 45th percentile

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.

PackageEcosystemAffectedFixed in
privatebin/privatebinPackagist<2.0.52.0.5
Identifiers
GHSA-xrjc-c68j-hp7w · CVE-2026-55891 · PKSA-t55m-4nf3-277t
Weakness (CWE)
CWE-116
Tags
Published
28 Aug 2026
Updated
28 Aug 2026

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

ScoreRatingCVSSVectorSource
0.0 None 3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:N 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

  1. 31 Oct 2026, 14:06 UTC First seen by agentprime
  2. 31 Oct 2026, 14:06 UTC Confirmed by OSV

Sources

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.