CVE-2025-65858Public exploitNetwork attack vector

Administrator-session script execution via stored username

Published Dec 2, 2025 · Updated Dec 2, 2025

Stored XSS in Calibre-Web 0.6.25 allows remote authenticated users to execute JavaScript in an administrator's browser. The user-management flow stores the username without validation or encoding, and /ajax/listusers inserts the returned value into the DOM without escaping. Administrator privileges are required to create the malicious user, and another administrator must view the user list; execution is confined to the affected origin.

CVSS severity3.5
Low
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in Calibre-Web 0.6.25 allows remote authenticated users to execute JavaScript in an administrator's browser. The user-management flow stores the username without validation or encoding, and /ajax/listusers inserts the returned value into the DOM without escaping. Administrator privileges are required to create the malicious user, and another administrator must view the user list; execution is confined to the affected origin.

The record

CVE
CVE-2025-65858
Published
Dec 2, 2025
Updated
Dec 2, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-79, T1203
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Dec 2, 2025CVE publishedPublication date reported by the CVE source.
  2. Dec 2, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

1.9GitHubCVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:P
3.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:L/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesadmin
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1203Exploitation for Client Execution

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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