CVE-2023-1788Network attack vector

Session reuse via persistent browser-close cookies

Published Apr 5, 2023 · Updated Feb 10, 2025

Insufficient session expiration in Firefly III before 6.0.0 allows remote authenticated users to reuse sessions after browser closure. The session configuration sets expire_on_close to false, so closing the browser leaves the session cookie valid instead of expiring it. Exploitation requires possession of a previously valid session cookie and preserves access to the associated account after the browser closes.

CVSS severity5.4
Medium
EPSS probability0.44%
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 Firefly III before 6.0.0 allows remote authenticated users to reuse sessions after browser closure. The session configuration sets expire_on_close to false, so closing the browser leaves the session cookie valid instead of expiring it. Exploitation requires possession of a previously valid session cookie and preserves access to the associated account after the browser closes.

The record

CVE
CVE-2023-1788
Published
Apr 5, 2023
Updated
Feb 10, 2025
Vendor
Firefly III
Product
Firefly III
Classifications
CWE-613, T1550.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 5, 2023CVE publishedPublication date reported by the CVE source.
  2. Feb 10, 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=unspecified <6

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Firefly III · Firefly IIIversion=unspecified <6

Published CVSS scores

5.4huntr.devCVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
4.2GitHubCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N

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 exploitUnconfirmed

Weakness, pattern, technique

CWE-613Insufficient Session Expiration
T1550.004Use Alternate Authentication Material: Web Session Cookie

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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