CVE-2026-40893Public exploitNetwork attack vector

Unauthenticated file manipulation via group-prefixed ExifTool tags

Published May 14, 2026 · Updated May 14, 2026

Path manipulation in Gotenberg before 8.31.0 allows remote attackers to move or rename uploaded files through unauthenticated HTTP requests. Metadata handling compares dangerous ExifTool tags only as bare names, so group-prefixed System:FileName and System:Directory keys bypass deletion while ExifTool resolves them to filesystem operations. Any client that can reach a metadata-capable conversion route can alter names, locations, or permissions within writable container paths and can interrupt affected requests.

CVSS severity8.2
High
EPSS probability0.35%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Path manipulation in Gotenberg before 8.31.0 allows remote attackers to move or rename uploaded files through unauthenticated HTTP requests. Metadata handling compares dangerous ExifTool tags only as bare names, so group-prefixed System:FileName and System:Directory keys bypass deletion while ExifTool resolves them to filesystem operations. Any client that can reach a metadata-capable conversion route can alter names, locations, or permissions within writable container paths and can interrupt affected requests.

The record

CVE
CVE-2026-40893
Published
May 14, 2026
Updated
May 14, 2026
Vendor
Gotenberg
Product
Gotenberg
Classifications
CWE-184, CWE-73, T1565.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 14, 2026CVE publishedPublication date reported by the CVE source.
  2. May 14, 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=< 8.31.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Gotenberg · Gotenbergversion=< 8.31.0

Published CVSS scores

8.2GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:L

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-184Incomplete List of Disallowed Inputs
CWE-73External Control of File Name or Path
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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Your stack

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