JSON-LD response manipulation via unescaped request URI
Published Aug 28, 2026 · Updated Aug 28, 2026
JSON injection in PrivateBin before 2.0.5 allows remote attackers to alter CORS-open JSON-LD responses through a crafted request target. The JSON-LD handler copies the sanitized REQUEST_URI into static templates with str_replace() but performs no JSON escaping before returning them. Exploitation requires a client or intermediary that preserves raw quotation marks; it can mislead structured-data consumers, but no direct script execution was demonstrated.
Summary
What happened
JSON injection in PrivateBin before 2.0.5 allows remote attackers to alter CORS-open JSON-LD responses through a crafted request target. The JSON-LD handler copies the sanitized REQUEST_URI into static templates with str_replace() but performs no JSON escaping before returning them. Exploitation requires a client or intermediary that preserves raw quotation marks; it can mislead structured-data consumers, but no direct script execution was demonstrated.
The record
- CVE
- CVE-2026-55891
- Published
- Aug 28, 2026
- Updated
- Aug 28, 2026
- Vendor
- PrivateBin
- Product
- PrivateBin
- Classifications
- CWE-116, T1190
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Aug 28, 2026CVE publishedPublication date reported by the CVE source.
- Aug 28, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=< 2.0.5
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- Upstream raw-request proof of conceptproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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