PrivateBin: Reflected JSON injection in backend responses via unescaped REQUEST_URI

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-55891
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-28 22:16:51 UTC
Updated2026-08-28 22:16:51 UTC
DescriptionPrivateBin is an online pastebin where the server has zero knowledge of pasted data. Prior to 2.0.5, Request::getRequestUri() in lib/Request.php passes $_SERVER['REQUEST_URI'] through FILTER_SANITIZE_URL, which does not remove quotation marks, angle brackets, or apostrophes, and Controller::_init() stores the attacker-controlled value in Controller::$_urlBase. Controller::_jsonld() in lib/Controller.php then uses str_replace() to insert that value without JSON escaping into js/types.jsonld, js/paste.jsonld, and the other JSON-LD templates used by /?jsonld= and /?pasteid. A raw quotation mark delivered by an HTTP client, proxy, or structured-data crawler that does not normalize the request target can break out of the JSON string and inject arbitrary key-value data into a CORS-open application/ld+json response. The jsonld branch in Controller::__construct() returns before _setCacheHeaders(), so the response also lacks X-Content-Type-Options: nosniff, Content Security Policy, X-Frame-Options, and Referrer-Policy. Direct script execution was not demonstrated, but manipulated responses can affect structured-data consumers or combine with less strict clients. This issue is fixed in version 2.0.5.

Risk And Classification

Primary CVSS: v3.1 0 NONE from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:N

Problem Types: CWE-116 | CWE-116 CWE-116: Improper Encoding or Escaping of Output

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary0NONECVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:N
3.1CNADECLARED0NONECVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
None

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA PrivateBin PrivateBin affected < 2.0.5 Not specified

References

ReferenceSourceLinkTags
github.com/PrivateBin/PrivateBin/releases/tag/2.0.5 [email protected] github.com
github.com/PrivateBin/PrivateBin/security/advisories/GHSA-xrjc-c68j-hp7w [email protected] github.com
github.com/PrivateBin/PrivateBin/commit/164c839c39688533ef0086575878e839... [email protected] github.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

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