CVE-2026-42451

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Source

https://cve.org/CVERecord?id=CVE-2026-42451

Import Source

https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-42451.json

JSON Data

https://api.osv.dev/v1/vulns/CVE-2026-42451

Aliases

GHSA-frv6-5wq5-9p24

Published

2026-05-08T22:51:21.920Z

Modified

2026-08-04T11:50:58.050594730Z

Severity

6.3 (Medium) CVSS_V3 - CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:L CVSS Calculator

Summary

Grimmory: Stored XSS via Malicious EPUB Enables Session Token Theft

Details

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.

Database specific

{
    "cwe_ids": [
        "CWE-79",
        "CWE-80"
    ],
    "cna_assigner": "GitHub_M",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/42xxx/CVE-2026-42451.json"
}

References

Affected packages

Git / github.com/grimmory-tools/grimmory

Affected ranges

Type

GIT

Repo

https://github.com/grimmory-tools/grimmory

Events

Introduced

Fixed

d0ba4aec9c6b19d6cf2f60ff7078abd8c1787ea0

Database specific

{
    "source": "AFFECTED_FIELD",
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "fixed": "2.3.1"
        }
    ]
}

Affected versions

v2.*

v2.2.1

v2.2.2

v2.2.3

v2.2.4

v2.2.5

v2.2.6

v2.3.0

Database specific

source

"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-42451.json"