CVE-2023-34457: MechanicalSoup is a Python library for automating interaction with websites

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MEDIUM 5.9REMOTEUPGRADE

CVE-2023-34457 is a medium-severity flaw (CVSS 5.9) affecting mechanicalsoup. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

MechanicalSoup is a Python library for automating interaction with websites. Starting in version 0.2.0 and prior to version 1.3.0, a malicious web server can read arbitrary files on the client using a `<input type="file" ...>` inside HTML form. All users of MechanicalSoup's form submission are affected, unless they took very specific (and manual) steps to reset HTML form field values. Version 1.3.0 contains a patch for this issue.

Why this priority

Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	5.9 (Medium)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	None
EPSS exploit chance	1.1% (top 35%)
CISA exploited list	No
Weakness	CWE-20
Published	2023-07-05
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: mechanicalsoup project

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2023-07-05 20:15 UTCPublished CVE record published
2026-06-17 06:03 UTCUpdated Record last modified

mechanicalsoup project mechanicalsoup UPGRADE

Affected: < 1.3.0

Fixed in: 1.3.0

Safe to downgrade to: no unaffected older release

1. Check installed version

pip show mechanicalsoup

2. UPGRADE to 1.3.0

pip install --upgrade "mechanicalsoup>=1.3.0"

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2023-34457?

mechanicalsoup: upgrade to 1.3.0. Exact commands for each OS are on this page.

Is CVE-2023-34457 being exploited?

CVE-2023-34457 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2023-34457 affect?

CVE-2023-34457 affects mechanicalsoup. Severity is medium (CVSS 5.9). MechanicalSoup is a Python library for automating interaction with websites. Starting in version 0.2.0 and prior to version 1.3.0, a malicious web server can read arbitrary files on the client using a `<input type="file" ...>` inside HTML f

How urgent is CVE-2023-34457?

Priority 47/100. Public exploit reference; Remotely exploitable, no login, no user action

Software pages

Python vulnerabilities

References

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