CVE-2021-4168Network attack vector

Account and project changes via forged requests

Published Dec 26, 2021 · Updated Aug 3, 2024

CSRF in ShowDoc before 2.9.15 allows remote attackers to alter projects and accounts through a logged-in user's browser. Multiple API controllers accepted state-changing identifiers and content from unrestricted request parameters, allowing cross-origin GET requests to invoke authenticated actions. Exploitation requires a logged-in user to follow attacker-controlled content; reachable actions include deleting pages or users, changing passwords, and transferring projects.

CVSS severity8.8
High
EPSS probability0.61%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

CSRF in ShowDoc before 2.9.15 allows remote attackers to alter projects and accounts through a logged-in user's browser. Multiple API controllers accepted state-changing identifiers and content from unrestricted request parameters, allowing cross-origin GET requests to invoke authenticated actions. Exploitation requires a logged-in user to follow attacker-controlled content; reachable actions include deleting pages or users, changing passwords, and transferring projects.

The record

CVE
CVE-2021-4168
Published
Dec 26, 2021
Updated
Aug 3, 2024
Vendor
ShowDoc
Product
ShowDoc
Classifications
CWE-352
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 26, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record 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=unspecified <2.9.15

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

ShowDoc · ShowDocversion=unspecified <2.9.15

Published CVSS scores

6.3HuntrCVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:H/A:N
8.8NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
6.8NVDAV:N/AC:M/Au:N/C:P/I:P/A:P

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.

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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)

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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