CVE-2026-55891
0.0 · NONEOverview
CVE-2026-55891 is a none-severity vulnerability. It was published on August 28, 2026 and has a CVSS 3.1 base score of 0.0 (NONE).
This vulnerability has a CVSS 3.1 base score of 0.0, rated NONE. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
Technical Description
PrivateBin 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-Opti
Remediation
Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
Frequently Asked Questions
What is CVE-2026-55891?
CVE-2026-55891 is a none-severity vulnerability. It was published on August 28, 2026 and has a CVSS 3.1 base score of 0.0 (NONE).
How severe is CVE-2026-55891?
This vulnerability has a CVSS 3.1 base score of 0.0, rated NONE. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
How do I fix or remediate CVE-2026-55891?
Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
How can CyberStrike help with CVE-2026-55891?
CyberStrike's AI-powered security agents can automatically detect CVE-2026-55891 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.
How CyberStrike Helps
AI agents map your attack surface to find vulnerabilities like this one.
Automated penetration testing that runs continuously, not just quarterly.
AI-driven PR review catches vulnerable dependencies before they ship.
Browser-based exploitation validates findings with real proof-of-concept.
Related NONE CVEs from 2026
View all →Pepr is a type safe K8s middleware. Prior to 1.0.5 , Pepr defaults to a cluster-admin RBAC configura
sigstore-python is a Python tool for generating and verifying Sigstore signatures. Prior to version
Asterisk is an open source private branch exchange and telephony toolkit. Prior to versions 20.7-cer
Asterisk is an open source private branch exchange and telephony toolkit. Prior to versions 20.7-cer
Winter is a free, open-source content management system (CMS) based on the Laravel PHP framework. Ve
Kruise provides automated management of large-scale applications on Kubernetes. Prior to versions 1.
Gradio is an open-source Python package designed for quick prototyping. Starting in version 4.16.0 a
hoppscotch is an open source API development ecosystem. Prior to version 2026.2.1, the DELETE /v1/ac
Emlog is an open source website building system. In 2.6.6 and earlier, the delete_async action (asyn
Unhead is a document head and template manager. Prior to 2.1.11, The link.href check in makeTagSafe
FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.24.0, there is an out-of
FreeScout is a free help desk and shared inbox built with PHP's Laravel framework. In versions 1.8.2