CVE-2026-53449Public exploit

Arbitrary file overwrite via CLI psd command

Published Jul 10, 2026 · Updated Jul 10, 2026

Arbitrary file write in coturn before 4.13.0 allows local users to overwrite files on the host through the CLI psd command. The psd handler in src/apps/relay/turn_admin_server.c strips the command prefix and passes the remaining unvalidated path to fopen in write mode before storing a session dump. Exploitation requires the CLI to be enabled and reachable plus its administrative password; files writable by the coturn process can be truncated and replaced with partly attacker-influenced session data.

CVSS severity6.0
Medium
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Arbitrary file write in coturn before 4.13.0 allows local users to overwrite files on the host through the CLI psd command. The psd handler in src/apps/relay/turn_admin_server.c strips the command prefix and passes the remaining unvalidated path to fopen in write mode before storing a session dump. Exploitation requires the CLI to be enabled and reachable plus its administrative password; files writable by the coturn process can be truncated and replaced with partly attacker-influenced session data.

The record

CVE
CVE-2026-53449
Published
Jul 10, 2026
Updated
Jul 10, 2026
Vendor
coturn
Product
coturn
Classifications
CWE-73, T1565.001
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Jul 10, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 10, 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=< 4.13.0

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

coturn · coturnversion=< 4.13.0

Published CVSS scores

6.0GitHub, Inc.CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

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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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

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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