CVE-2026-33330Public exploitNetwork attack vector

File overwrite via forged ONLYOFFICE save callback

Published Mar 24, 2026 · Updated Mar 24, 2026

Incorrect authorization in FileRise before 3.10.0 allows remote authenticated users with read access to overwrite files through ONLYOFFICE. OnlyOfficeController::config issues a signed save callback URL to view-only sessions, and callback trusts body-controlled actions[0].userid as the saving actor. ONLYOFFICE must be enabled, and target-file read access is required; an admin actor value makes callback fetch body.url and replace the file.

CVSS severity7.1
High
EPSS probability0.38%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Incorrect authorization in FileRise before 3.10.0 allows remote authenticated users with read access to overwrite files through ONLYOFFICE. OnlyOfficeController::config issues a signed save callback URL to view-only sessions, and callback trusts body-controlled actions[0].userid as the saving actor. ONLYOFFICE must be enabled, and target-file read access is required; an admin actor value makes callback fetch body.url and replace the file.

The record

CVE
CVE-2026-33330
Published
Mar 24, 2026
Updated
Mar 24, 2026
Vendor
error311
Product
FileRise
Classifications
CWE-863
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 24, 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=< 3.10.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

error311 · FileRiseversion=< 3.10.0

Published CVSS scores

7.1GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/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-863Incorrect Authorization

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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