CVE-2025-53826Public exploitNetwork attack vector

Account access persistence via replayable logout JWTs

Published Jul 15, 2025 · Updated Jul 15, 2025

Insufficient session expiration in File Browser 2.39.0 allows remote attackers with a captured JWT to retain authenticated access after logout. The backend maintains no active-session registry or token blacklist, so auth.go continues to accept a logged-out JWT until its natural expiration. Possession of a previously issued token is required; replay grants the token holder the same authenticated API access and file permissions as the original session.

CVSS severity9.8
Critical
EPSS probability0.50%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Insufficient session expiration in File Browser 2.39.0 allows remote attackers with a captured JWT to retain authenticated access after logout. The backend maintains no active-session registry or token blacklist, so auth.go continues to accept a logged-out JWT until its natural expiration. Possession of a previously issued token is required; replay grants the token holder the same authenticated API access and file permissions as the original session.

The record

CVE
CVE-2025-53826
Published
Jul 15, 2025
Updated
Jul 15, 2025
Vendor
File Browser
Product
File Browser
Classifications
CWE-385, CWE-305, CWE-613, T1550.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 15, 2025CVE publishedPublication date reported by the CVE source.
  2. Jul 15, 2025Record 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== 2.39.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

File Browser · File Browserversion== 2.39.0

Published CVSS scores

7.7GitHub, Inc.CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:P
9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-385Covert Timing Channel
CWE-305Authentication Bypass by Primary Weakness
CWE-613Insufficient Session Expiration
T1550.004Use Alternate Authentication Material: Web Session Cookie

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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