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Vulnerability record · public intelligence
CVE-2026-55891
UNKNOWN

PrivateBin has reflected JSON injection in backend responses via unescaped REQUEST_URI

Published Aug 28, 2026 · Updated Nov 3, 2026

Severity · CVSSUNKNOWN · Not scored
Known exploitationNot listed
EPSS / likelihood0.54%
QFinch risk scoreNot available

Original summary

Normalized public record · Updated Nov 3, 2026

PrivateBin has reflected JSON injection in backend responses via unescaped REQUEST_URI

Publisher and source text is retained separately from QFinch interpretation.

QFinch assessment

## Vulnerability Details

Potential impact

Reflected, unauthenticated injection of attacker-controlled content into a CORS-open application/ld+json response, plus a missing X-Content-Type-Options: nosniff header on this single response path (present everywhere else). No direct script execution was demonstrated on current browsers (this content type is generally not HTML-sniffed), but it is a real output-encoding bug (CWE-116) and a defense-in-depth gap that could be exploited by structured-data consumers or in combination with other issues / less-strict clients.

Evidence: public source records

Affected products

Affected scope reported by the available public evidence
Affected package, product or rangeFix status
Consult the referenced vendor advisory for affected versions.Consult source advisory

Matching a version is only one part of assessing exposure. QFinch has not assessed your environment on this public page.

Remediation

Apply the vendor-supported fixed release or mitigation, then verify the affected component is no longer reachable.

  1. Confirm the affected product and reachable code path exist in your environment.
  2. Apply the vendor-supported patch or mitigation from the primary advisory.
  3. Rescan the exact deployed revision and retain verification evidence.
Review primary references

Evidence coverage

FIRST-EPSSCVE-LIST-V5
SSVC priority
LOW
Confidence
Not available
Aliases
None reported

Scores appear only when corresponding evidence exists. Missing data is never interpreted as zero risk.

Sources and record history

  1. Security advisory ↗
  2. Patch commit ↗
  3. Source repository ↗

Record history

Published Aug 28, 2026 · Last refreshed Nov 3, 2026

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