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TI-2026-40342 Aliases CVE-2026-55891GHSA-xrjc-c68j-hp7w

PrivateBin: Reflected JSON injection in backend responses via unescaped REQUEST_URI

Priority LOW 36CWE-116Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
None · None · None
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub.

Summary

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-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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00539 45th percentileScored 2026-11-07
Fix Fixed PrivateBin (PrivateBin): 2.0.5privatebin/privatebin (Packagist): 2.0.5

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
PrivateBinPrivateBinbefore 2.0.52.0.5Patch availableCNA
—privatebin/privatebin (Packagist)before 2.0.52.0.5Patch availableGHSA-xrjc-c68j-hp7w
  • PrivateBin VendorPrivateBin Affected before 2.0.5 Fixed in 2.0.5 Patch available CNA
  • privatebin/privatebin (Packagist) Vendor— Affected before 2.0.5 Fixed in 2.0.5 Patch available GHSA-xrjc-c68j-hp7w

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPEVersionsRoleVendor
cpe:2.3:a:privatebin:privatebin:*:*:*:*:*:*:*:*——PrivateBin
  • cpe:2.3:a:privatebin:privatebin:*:*:*:*:*:*:*:* Versions — — ·PrivateBin

Remediation

  • Fix · CNA PrivateBin (PrivateBin) Fixed in 2.0.5
  • Fix · GHSA-xrjc-c68j-hp7w privatebin/privatebin (Packagist) Fixed in 2.0.5 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-55891
  2. 2026-10-03 Alias added: GHSA-xrjc-c68j-hp7w

References

Other 5

  • TI-2022-08646 Persistent Cross-site Scripting (XSS) vulnerability in PrivateBin CVSS 3.1HIGH 8.2
  • TI-2025-38979 PrivateBin persistent HTML injection in attachment filename enables redirect and defacement CVSS 3.1MEDIUM 5.8
  • TI-2025-40057 PrivateBin vulnerable to malicious filename use for self-XSS / HTML injection locally for users CVSS 3.1MEDIUM 5.4
  • TI-2025-40060 PrivateBin's template-switching feature allows arbitrary local file inclusion through path traversal CVSS 3.1MEDIUM 5.8
  • TI-2024-26793 PrivateBin allows shortening of URLs for other domains CVSS 3.1MEDIUM 5.3
  • TI-2020-04279 Persistent XSS vulnerability in filename of attached file in PrivateBin CVSS 3.1MEDIUM 6.1
See all 7 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences