CVE-2023-34457Public exploitNetwork attack vector

Arbitrary file disclosure via server-supplied form path

Published Jul 5, 2023 · Updated Feb 13, 2025

Improper input validation in MechanicalSoup before 1.3.0 allows remote attackers to read arbitrary client files via HTML forms. Browser.get_request_kwargs trusts a server-supplied file-input value as a local path, opens it, and sends its contents in a multipart request. Exploitation requires a client application to select and submit the attacker-controlled form without manually clearing or replacing the supplied file value.

CVSS severity8.7
High
EPSS probability1.08%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Improper input validation in MechanicalSoup before 1.3.0 allows remote attackers to read arbitrary client files via HTML forms. Browser.get_request_kwargs trusts a server-supplied file-input value as a local path, opens it, and sends its contents in a multipart request. Exploitation requires a client application to select and submit the attacker-controlled form without manually clearing or replacing the supplied file value.

The record

CVE
CVE-2023-34457
Published
Jul 5, 2023
Updated
Feb 13, 2025
Vendor
MechanicalSoup Project
Product
MechanicalSoup
Classifications
CWE-20, T1048
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 5, 2023CVE publishedPublication date reported by the CVE source.
  2. Feb 13, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0.2.0 <1.3.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

MechanicalSoup Project · MechanicalSoupversion=0.2.0 <1.3.0
MechanicalSoup · MechanicalSoupversion=>= 0.2.0, < 1.3.0

Published CVSS scores

8.7GitHubCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
5.9GitHubCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/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.

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-20Improper Input Validation
T1048Exfiltration Over Alternative Protocol

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo