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CVE Vulnerability Details :
CVE-2026-42451
PUBLISHED
More InfoOfficial Page
Assigner-GitHub_M
Assigner Org ID-a0819718-46f1-4df5-94e2-005712e83aaa
View Known Exploited Vulnerability (KEV) details
Published At-08 May, 2026 | 22:51
Updated At-08 May, 2026 | 22:51
Rejected At-
▼CVE Numbering Authority (CNA)
Grimmory: Stored XSS via Malicious EPUB Enables Session Token Theft

Grimmory is a self-hosted digital library. Prior to version 2.3.1, a stored cross-site scripting (XSS) vulnerability in Grimmory's browser-based EPUB reader allows an attacker to embed arbitrary JavaScript in a crafted EPUB file. When a victim opens the book, the script executes in their browser with full access to the Grimmory application's session context. This can enable session token theft and account takeover, including administrative access if an administrator opens the affected book. This issue has been patched in version 2.3.1.

Affected Products
Vendor
grimmory-tools
Product
grimmory
Versions
Affected
  • < 2.3.1
Problem Types
TypeCWE IDDescription
CWECWE-79CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CWECWE-80CWE-80: Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS)
Type: CWE
CWE ID: CWE-79
Description: CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Type: CWE
CWE ID: CWE-80
Description: CWE-80: Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS)
Metrics
VersionBase scoreBase severityVector
3.16.3MEDIUM
CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:L
Version: 3.1
Base score: 6.3
Base severity: MEDIUM
Vector:
CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:L
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
https://github.com/grimmory-tools/grimmory/security/advisories/GHSA-frv6-5wq5-9p24
x_refsource_CONFIRM
http://github.com/grimmory-tools/grimmory/releases/tag/v2.3.1
x_refsource_MISC
Hyperlink: https://github.com/grimmory-tools/grimmory/security/advisories/GHSA-frv6-5wq5-9p24
Resource:
x_refsource_CONFIRM
Hyperlink: http://github.com/grimmory-tools/grimmory/releases/tag/v2.3.1
Resource:
x_refsource_MISC
Details not found