CVE-2026-59856Public exploit

Code execution via unescaped PHP completion class name

Published Jul 9, 2026 · Updated Jul 9, 2026

Code injection in Vim before 9.2.0736 allows context-dependent attackers to execute operating-system commands through a crafted PHP file. phpcomplete#GetClassContentsStructure() concatenates a buffer-derived class or trait name into a single-quoted search() command passed to win_execute() without escaping a quote or Ex-command separator. Execution occurs as the Vim user only after a victim opens the file with filetype plugins enabled and manually invokes PHP omni-completion.

CVSS severity8.4
High
EPSS probability0.22%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Code injection in Vim before 9.2.0736 allows context-dependent attackers to execute operating-system commands through a crafted PHP file. phpcomplete#GetClassContentsStructure() concatenates a buffer-derived class or trait name into a single-quoted search() command passed to win_execute() without escaping a quote or Ex-command separator. Execution occurs as the Vim user only after a victim opens the file with filetype plugins enabled and manually invokes PHP omni-completion.

The record

CVE
CVE-2026-59856
Published
Jul 9, 2026
Updated
Jul 9, 2026
Vendor
Vim
Product
Vim
Classifications
CWE-94, T1204.002, T1059
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 9, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 9, 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=< 9.2.0736

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Vim · Vimversion=< 9.2.0736

Published CVSS scores

7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
8.4GitHub, Inc.CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA: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)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-94Improper Control of Generation of Code ('Code Injection')
T1204.002User Execution: Malicious File
T1059Command and Scripting Interpreter

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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