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FOSSBilling CVE-2026-43918

| EUVDEUVD-2026-41956 HIGH
Insufficient Session Expiration (CWE-613)
2026-07-06 GitHub_M
Information Disclosure PHP Fossbilling
8.7
CVSS 4.0 · Vendor: GitHub_M
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Severity by source

Vendor (GitHub_M) PRIMARY
8.7 HIGH
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
vuln.today AI
8.8 HIGH

PR:L because a valid pre-existing authenticated session is required; AV:N/AC:L/UI:N as the retained session is used normally over the network; C/I/H/A:H reflect full role-level access being retained.

3.1 AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
4.0 AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Primary rating from Vendor (GitHub_M).

CVSS VectorVendor: GitHub_M

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
X

Lifecycle Timeline

2
Patch available
Jul 06, 2026 - 23:01 EUVD
Analysis Generated
Jul 06, 2026 - 22:27 vuln.today

DescriptionCVE.org

FOSSBilling is a free, open-source billing and client management system. Prior to version 0.8.0, when a client or staff/admin account is suspended or marked inactive, existing authenticated sessions are not invalidated. The session identity loaders in src/di.php (loggedin_client and loggedin_admin) only reject sessions if the backing account record no longer exists in the database. They do not verify that the account's status is still active. This allows a suspended or deactivated user to retain full access until their session naturally expires. This issue has been fixed in version 0.8.0.

Articles & Coverage 1

News 5 New PHP Vulnerabilities - 2 Critical, 3 High, 2 With POC Jul 07, 2026

AnalysisAI

Privilege retention in FOSSBilling before 0.8.0 allows a suspended or deactivated client, staff, or admin to keep full authenticated access because the session identity loaders in src/di.php never re-check account status. Suspending or deactivating a user does not terminate their live session - access persists until the session expires naturally. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Authenticate to FOSSBilling as client/staff
Delivery
Keep session token active
Exploit
Admin suspends the account
Execution
di.php loader passes on record existence
Impact
Continue privileged actions until expiry
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Vulnerability AssessmentAI

Exploitation Requires the attacker to already hold a valid, authenticated FOSSBilling session (client, staff, or admin) established before an administrator suspends or marks the account inactive - the vulnerability manifests specifically in the loggedin_client and loggedin_admin loaders in src/di.php, which validate only account existence, not status. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:L/UI:N, VC:H/VI:H/VA:H, score 8.7) reflects that an already-authenticated actor with low privileges retains high confidentiality, integrity, and availability impact over their own accessible scope - but the PR:L requirement is the critical limiter: this is not an unauthenticated network compromise. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario A hosting reseller with a staff or client login is caught abusing the platform and an administrator suspends their account, assuming access is revoked. Because the pre-0.8.0 session loader only checks that the account row exists, the suspended user simply keeps using their still-open browser session to view customer data, place orders, or change settings until the session times out. …
Remediation Upgrade to FOSSBilling 0.8.0, which adds account-status verification to the session identity loaders (Vendor-released patch: 0.8.0); see the advisory at https://github.com/FOSSBilling/FOSSBilling/security/advisories/GHSA-qv6c-v49w-8g2j and release notes at https://github.com/FOSSBilling/FOSSBilling/releases/tag/0.8.0. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

24 hours: Audit all FOSSBilling installations for versions before 0.8.0; review active session logs for suspended/deactivated accounts currently accessing the system. …

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Threat intelligence, references, and detailed analysis are available after sign-in.

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CVE-2026-43918 vulnerability details – vuln.today
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