CVE-2026-2898Public exploitNetwork attack vector

Arbitrary file write via cookie deserialization

Published Feb 22, 2026 · Updated Feb 22, 2026

Unsafe deserialization in FunAdmin 7.1.0-rc1 through 7.1.0-rc4 allows remote authenticated users to write arbitrary files. The getMember method in app/common/service/AuthCloudService.php base64-decodes the cloud_account cookie and passes it directly to unserialize without restricting classes. A backend session, user interaction, and a usable League Flysystem POP chain are required; successful exploitation can place attacker-chosen PHP files in a writable web path.

CVSS severity6.5
Medium
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

Unsafe deserialization in FunAdmin 7.1.0-rc1 through 7.1.0-rc4 allows remote authenticated users to write arbitrary files. The getMember method in app/common/service/AuthCloudService.php base64-decodes the cloud_account cookie and passes it directly to unserialize without restricting classes. A backend session, user interaction, and a usable League Flysystem POP chain are required; successful exploitation can place attacker-chosen PHP files in a writable web path.

The record

CVE
CVE-2026-2898
Published
Feb 22, 2026
Updated
Feb 22, 2026
Vendor
FunAdmin
Product
FunAdmin
Classifications
CWE-502, CWE-20, T1190, T1505.003
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 22, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 22, 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=7.1.0-rc1
  2. Affected versionversion=7.1.0-rc2
  3. Affected versionversion=7.1.0-rc3
  4. Affected versionversion=7.1.0-rc4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

FunAdmin · FunAdminversion=7.1.0-rc1; version=7.1.0-rc2; version=7.1.0-rc3; version=7.1.0-rc4

Published CVSS scores

5.5VulDBCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:L
6.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
6.5VulDBAV:N/AC:L/Au:S/C:P/I:P/A:P
2.0VulDBCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P

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)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-502Deserialization of Untrusted Data
CWE-20Improper Input Validation
T1190Exploit Public-Facing Application
T1505.003Web Shell

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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