CVE-2021-25965Network attack vector

Administrator account takeover via missing CSRF validation

Published Nov 16, 2021 · Updated Apr 30, 2025

Cross-site request forgery in Calibre-Web 0.6.0 through 0.6.13 allows remote attackers to create an administrator account. State-changing forms and AJAX requests accept the victim's authenticated session without a per-request CSRF token, including the user-creation workflow. An attacker must lure a signed-in user to submit a crafted request, after which attacker-controlled administrator credentials permit application takeover.

CVSS severity8.8
High
EPSS probability0.53%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cross-site request forgery in Calibre-Web 0.6.0 through 0.6.13 allows remote attackers to create an administrator account. State-changing forms and AJAX requests accept the victim's authenticated session without a per-request CSRF token, including the user-creation workflow. An attacker must lure a signed-in user to submit a crafted request, after which attacker-controlled administrator credentials permit application takeover.

The record

CVE
CVE-2021-25965
Published
Nov 16, 2021
Updated
Apr 30, 2025
Vendor
Calibre-Web
Product
Calibre-Web
Classifications
CWE-352, CAPEC-62, T1189
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 16, 2021CVE publishedPublication date reported by the CVE source.
  2. Apr 30, 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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0.6.0 <unspecified
  2. Affected versionversion=unspecified <=0.6.13

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Calibre-Web · Calibre-Webversion=0.6.0 <unspecified; version=unspecified <=0.6.13

Published CVSS scores

6.8NIST NVDAV:N/AC:M/Au:N/C:P/I:P/A:P
8.8MendCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-352Cross-Site Request Forgery (CSRF)
CAPEC-62Cross Site Request Forgery
T1189Drive-by Compromise

Public exploit references

No public exploit references are available in this record.

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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