CVE-2026-28459Network attack vector

Authenticated arbitrary file write via sessionFile path

Published Mar 5, 2026 · Updated Mar 5, 2026

Arbitrary file write in OpenClaw before 2026.2.12 allows remote authenticated users to append transcript data outside the sessions directory. The gateway trusts the sessionFile value while resolving a session transcript and writes JSONL records without checking that the resolved path remains under the configured sessions directory. Gateway credentials are required; writable files are limited by the service account's filesystem permissions, but repeated appends can corrupt configuration or interrupt service.

CVSS severity7.1
High
EPSS probability0.36%
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 OpenClaw before 2026.2.12 allows remote authenticated users to append transcript data outside the sessions directory. The gateway trusts the sessionFile value while resolving a session transcript and writes JSONL records without checking that the resolved path remains under the configured sessions directory. Gateway credentials are required; writable files are limited by the service account's filesystem permissions, but repeated appends can corrupt configuration or interrupt service.

The record

CVE
CVE-2026-28459
Published
Mar 5, 2026
Updated
Mar 5, 2026
Vendor
OpenClaw Foundation
Product
OpenClaw
Classifications
CWE-23, CWE-73, T1565.001
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 5, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 5, 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=0 <2026.2.12

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

OpenClaw Foundation · OpenClawversion=0 <2026.2.12

Published CVSS scores

7.1VulnCheckCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H
7.1VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N
8.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-23Relative Path Traversal
CWE-73External Control of File Name or Path
T1565.001Stored Data Manipulation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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