CVE-2022-24837Network attack vector

Uploaded-image disclosure via predictable filename counters

Published Apr 11, 2022 · Updated Apr 23, 2025

Information disclosure in HedgeDoc 1.9.1 through 1.9.2 allows remote attackers to read uploaded images via predictable URLs. The /uploadimage route lets Formidable 2 name each file with a per-process hexoid prefix plus an incrementing counter, and the prefix changes only after restart or 256 uploads. Any network client that can reach uploaded files can enumerate neighboring names; Lutim and imgur backends are not affected.

CVSS severity5.3
Medium
EPSS probability1.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in HedgeDoc 1.9.1 through 1.9.2 allows remote attackers to read uploaded images via predictable URLs. The /uploadimage route lets Formidable 2 name each file with a per-process hexoid prefix plus an incrementing counter, and the prefix changes only after restart or 256 uploads. Any network client that can reach uploaded files can enumerate neighboring names; Lutim and imgur backends are not affected.

The record

CVE
CVE-2022-24837
Published
Apr 11, 2022
Updated
Apr 23, 2025
Vendor
HedgeDoc
Product
HedgeDoc
Classifications
CWE-434, CWE-200, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 11, 2022CVE publishedPublication date reported by the CVE source.
  2. Apr 23, 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=>=1.9.1, < 1.9.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

HedgeDoc · HedgeDocversion=>=1.9.1, < 1.9.3

Published CVSS scores

5.0NIST National Vulnerability DatabaseAV:N/AC:L/Au:N/C:P/I:N/A:N
5.3GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-434Unrestricted Upload of File with Dangerous Type
CWE-200Exposure of Sensitive Information to an Unauthorized Actor
T1190Exploit Public-Facing Application

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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