CVE-2026-55878

File read and overwrite via recipe path traversal

Published Jul 8, 2026 · Updated Jul 8, 2026

Path traversal in Symfony UX Toolkit 2.32.0 through 2.36.0 and 3.0.0 through 3.1.0 allows attackers to read or overwrite local files. The ux:install command accepts .. segments as relative copy-files source and destination paths, then Path::join resolves them outside recipe and target directories. A developer or CI runner must install an attacker-controlled or compromised kit; overwriting controllers, Git hooks, or .env files enables code execution with that process's privileges.

CVSS severity7.8
High
EPSS probability0.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Path traversal in Symfony UX Toolkit 2.32.0 through 2.36.0 and 3.0.0 through 3.1.0 allows attackers to read or overwrite local files. The ux:install command accepts .. segments as relative copy-files source and destination paths, then Path::join resolves them outside recipe and target directories. A developer or CI runner must install an attacker-controlled or compromised kit; overwriting controllers, Git hooks, or .env files enables code execution with that process's privileges.

The record

CVE
CVE-2026-55878
Published
Jul 8, 2026
Updated
Jul 8, 2026
Vendor
Symfony
Product
Symfony UX
Classifications
CWE-22, T1203
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 8, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 8, 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=>= 2.32.0, < 2.36.1
  2. Affected versionversion=>= 3.0.0, < 3.2.0

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Symfony · Symfony UXversion=>= 2.32.0, < 2.36.1; version=>= 3.0.0, < 3.2.0

Published CVSS scores

7.8GitHubCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

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)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
T1203Exploitation for Client Execution

Public exploit references

No public exploit references are available in this record.

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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