CVE-20XX-?
agent?

CVE-2026-42451

6.3 MEDIUM 0.1% exploit odds Fix listed XSS Browser & mail

What it is

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.

At a glance

Exploitability
Can be exploited locally on the machine with a low-privilege account, but needs a user to act. High risk of data exposure, data tampering.
Exploit odds
0.1% chance of exploitation in the next 30 days (EPSS).
Fix
A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

  1. PublishedDisclosed publicly on CVE.org and NVD
  2. Last updatedMost recent change to the record

Why it ranks here

Details

Published
Last modified
Exploit probability
0.1% · EPSS, next 30 days
Weakness
CWE-79 · Cross-site scripting
Record status
Deferred

Attack profile CVSS 3.1 · 6.3

Attack vector
Local
Complexity
High
Privileges needed
Low
User interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
Low
Raw vector

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

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2026-42451.md and follow it. Check whether this project is affected by CVE-2026-42451. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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Fix and advisories

References

NVD record · CVE.org record