CVE-2026-82982Public exploitNetwork attack vectorHinoki check available

Approval-state tampering via omitted etag validation

Published Sep 18, 2026 · Updated Sep 18, 2026

Improper input validation in Nextcloud Approval 1.0.0 through 3.0.0 allows remote authenticated users to approve unreviewed file states. The approve/reject endpoint checks the current file etag only when a nonempty etag parameter is supplied, so removing the field bypasses the freshness comparison. Exploitation requires an authenticated approver session and the ability to alter its request, and it can approve or reject content changed after review.

CVSS severity4.3
Medium
EPSS probability0.33%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Improper input validation in Nextcloud Approval 1.0.0 through 3.0.0 allows remote authenticated users to approve unreviewed file states. The approve/reject endpoint checks the current file etag only when a nonempty etag parameter is supplied, so removing the field bypasses the freshness comparison. Exploitation requires an authenticated approver session and the ability to alter its request, and it can approve or reject content changed after review.

The record

CVE
CVE-2026-82982
Published
Sep 18, 2026
Updated
Sep 18, 2026
Vendor
Nextcloud GmbH
Product
Approval
Classifications
CWE-840, T1565.001
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 18, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 18, 2026Record 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=1.0.0 <=3.0.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Nextcloud GmbH · Approvalversion=1.0.0 <=3.0.0

Published CVSS scores

4.3HackerOne CNACVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/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.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-840Business Logic Errors
T1565.001Stored Data Manipulation

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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