CVE-2021-32744Network attack vector

Unauthenticated file access via guessable identifiers

Published Jul 21, 2021 · Updated Aug 3, 2024

Authorization bypass in Collabora Online before 4.2.17-1 and 6.4.0 through 6.4.9-5 allows remote attackers to read open files. The editor accepts a guessed, user-controlled file identifier without enforcing authorization for the corresponding open document. Exploitation requires an active document and a guessable identifier, whose predictability depends on the external file-storage implementation.

CVSS severity7.5
High
EPSS probability1.05%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authorization bypass in Collabora Online before 4.2.17-1 and 6.4.0 through 6.4.9-5 allows remote attackers to read open files. The editor accepts a guessed, user-controlled file identifier without enforcing authorization for the corresponding open document. Exploitation requires an active document and a guessable identifier, whose predictability depends on the external file-storage implementation.

The record

CVE
CVE-2021-32744
Published
Jul 21, 2021
Updated
Aug 3, 2024
Vendor
Collabora Productivity
Product
Collabora Online
Classifications
CWE-639, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 21, 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=< 4.2.17-1
  2. Affected versionversion=>= 6.4.0, < 6.4.9-5

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Collabora Productivity · Collabora Onlineversion=< 4.2.17-1; version=>= 6.4.0, < 6.4.9-5

Published CVSS scores

9.8GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
5.0NIST NVDAV:N/AC:L/Au:N/C:P/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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-639Authorization Bypass Through User-Controlled Key
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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