CVE-2021-40884Public exploitNetwork attack vector

Authenticated file disclosure and modification via unchecked IDs

Published Oct 11, 2021 · Updated Aug 4, 2024

Missing authorization in ProjectSend r1295 allows remote authenticated users with the uploader role to download and edit other users' files. The download path in process.php trusts id, while files-edit.php trusts ids, without verifying that each referenced file belongs to the requester. An uploader account is required; successful requests disclose private file contents and permit unauthorized modification without interrupting service.

CVSS severity8.1
High
EPSS probability0.95%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Missing authorization in ProjectSend r1295 allows remote authenticated users with the uploader role to download and edit other users' files. The download path in process.php trusts id, while files-edit.php trusts ids, without verifying that each referenced file belongs to the requester. An uploader account is required; successful requests disclose private file contents and permit unauthorized modification without interrupting service.

The record

CVE
CVE-2021-40884
Published
Oct 11, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-862, T1213
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 11, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

5.5NVDAV:N/AC:L/Au:S/C:P/I:P/A:N
8.1NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/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.

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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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-862Missing Authorization
T1213Data from Information Repositories

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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