CVE-2026-82543Public exploitNetwork attack vectorHinoki check available

Pickup-limit bypass via non-atomic usage updates

Published Aug 30, 2026 · Updated Aug 30, 2026

Race condition in vastsa FileCodeBox 2.0 through 2.3 allows remote attackers to bypass pickup limits with concurrent requests. update_file_usage performs a non-atomic read, decrement, and full-record save, so parallel requests consume stale expired_count values and overwrite one another. A valid share code and a count-limited share are required, after which parallel requests retrieve more copies than configured.

CVSS severity7.3
High
EPSS probability0.30%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Race condition in vastsa FileCodeBox 2.0 through 2.3 allows remote attackers to bypass pickup limits with concurrent requests. update_file_usage performs a non-atomic read, decrement, and full-record save, so parallel requests consume stale expired_count values and overwrite one another. A valid share code and a count-limited share are required, after which parallel requests retrieve more copies than configured.

The record

CVE
CVE-2026-82543
Published
Aug 30, 2026
Updated
Aug 30, 2026
Vendor
vastsa
Product
FileCodeBox
Classifications
CWE-362, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 30, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 30, 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=2.0
  2. Affected versionversion=2.1
  3. Affected versionversion=2.2
  4. Affected versionversion=2.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

vastsa · FileCodeBoxversion=2.0; version=2.1; version=2.2; version=2.3

Published CVSS scores

7.3INCIBE-CERTCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
7.5INCIBE-CERTAV:N/AC:L/Au:N/C:P/I:P/A:P
6.9VulDBCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E: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.

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 exploitPublished

Weakness, pattern, technique

CWE-362Race Condition
T1190Exploit Public-Facing Application

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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