rhwp browser extension performs SSRF / private-network requests and leaks HWP preview data to untrusted pages

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-54565
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-17 21:17:16 UTC
Updated2026-09-17 21:17:16 UTC
Descriptionrhwp is an HWP viewer and editor implemented in Rust and WebAssembly. Prior to rhwp 0.7.15 and rhwp Chrome and Firefox extension 0.2.4, the browser extensions use an all-URLs host permission to detect HWP and HWPX links on visited pages, but the service workers do not validate message senders, URL schemes, or destination addresses before privileged fetches. The affected paths are rhwp-chrome/manifest.json, rhwp-chrome/content-script.js, rhwp-chrome/sw/message-router.js, rhwp-chrome/sw/thumbnail-extractor.js, rhwp-firefox/manifest.json, rhwp-firefox/content-script.js, rhwp-firefox/sw/message-router.js, and rhwp-firefox/sw/thumbnail-extractor.js. An untrusted page can make the fetch-file and extract-thumbnail handlers request localhost or private-network resources. When a target HWP or HWPX file contains an extractable PrvImage, the extension returns the preview as a data URI in page-readable DOM, allowing page script to read it. The flaw also permits internal-resource existence and port probing and extension presence or version fingerprinting. Exploitation requires a user to visit an untrusted page while the extension is enabled, and preview disclosure is limited to an extractable PrvImage. This issue is fixed in rhwp 0.7.15 and rhwp Chrome and Firefox extension 0.2.4.

Risk And Classification

Primary CVSS: v3.1 4.7 MEDIUM from [email protected]

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

Problem Types: CWE-200 | CWE-359 | CWE-918 | CWE-1385 | CWE-200 CWE-200: Exposure of Sensitive Information to an Unauthorized Actor | CWE-359 CWE-359: Exposure of Private Personal Information to an Unauthorized Actor | CWE-918 CWE-918: Server-Side Request Forgery (SSRF) | CWE-1385 CWE-1385: Missing Origin Validation in WebSockets

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary4.7MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:N/A:N
3.1CNADECLARED4.7MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:N/A:N

CVSS v3.1 Breakdown

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

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Edwardkim Rhwp affected < 0.7.15 Not specified

References

ReferenceSourceLinkTags
github.com/edwardkim/rhwp/releases/tag/v0.7.15 [email protected] github.com
github.com/edwardkim/rhwp/security/advisories/GHSA-j972-m9fh-g22m [email protected] github.com
github.com/edwardkim/rhwp/commit/e07b76ba79f42078c6cdf1045b58f894ec55bdf9 [email protected] github.com
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