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CVE-2026-112374medium5.1

FOSSBilling before 0.8.9 Login CSRF via Staff Guest Login API

Impact

FOSSBilling before 0.8.9 contains a Cross-Site Request Forgery vulnerability in the staff guest login endpoint (POST /api/guest/staff/login) that allows remote attackers to force authentication because checkGuestClientAuthentication() only allowlists client_login and client_create, leaving staff_login without CSRF or Origin validation. Attackers can host an auto-submitting HTML form with attacker-controlled credentials to silently log a victim's browser into the attacker's staff account.

Source excerpt · VulnCheck

Affected packages

This source has no supported package-version data for matching. You can read the advisory here, but this record alone cannot power a dependency check.

Affected products

Vendor version evidence. Product records are separate from automatic dependency matching.

FOSSBilling · VulnCheck

FOSSBilling

1 range
VulnCheck version evidence

Package identity

pkg:github/FOSSBilling/FOSSBilling

Identity supplied by VulnCheck. Version matching requires compatible range evidence.

Compare with this publisher’s ranges. This does not inspect your installation.

affected

0.1.0 → before 0.8.9

semver versions

unaffected

unknown

Other versions: unaffected

Original source description

FOSSBilling before 0.8.9 contains a Cross-Site Request Forgery vulnerability in the staff guest login endpoint (POST /api/guest/staff/login) that allows remote attackers to force authentication because checkGuestClientAuthentication() only allowlists client_login and client_create, leaving staff_login without CSRF or Origin validation. Attackers can host an auto-submitting HTML form with attacker-controlled credentials to silently log a victim's browser into the attacker's staff account.

Inside the record

Evidence available

Package identity
Version evidence
Remediation guidance · not supplied
Weakness classification
Additional publishers · not supplied

Describes the evidence in this view, not whether the product is safe.

Original records

CVE-2026-112374

View the latest unmodified CVE JSON from the official source. It may be newer than this imported page.

cve.new JSON →

Underlying weaknesses

The source’s classification of what caused the vulnerability.

CWE-352 ↗

Cross-Site Request Forgery (CSRF)

VulnCheck

Related →

Environment requirements

These conditions apply together as specified by the publisher. A matching product name alone does not establish exposure.

VulnCheck · platform conditions

Any condition may hold

Any condition may hold

Vulnerable product

cpe:2.3:a:fossbilling:fossbilling:-:*:*:*:*:*:*:*

From (inclusive): 0.1.0

Before: 0.8.9

Original applicability statements
[
  {
    "operator": "OR",
    "nodes": [
      {
        "operator": "OR",
        "cpeMatch": [
          {
            "vulnerable": true,
            "criteria": "cpe:2.3:a:fossbilling:fossbilling:-:*:*:*:*:*:*:*",
            "versionStartIncluding": "0.1.0",
            "versionEndExcluding": "0.8.9"
          }
        ]
      }
    ]
  }
]
Contributing organizations · 1
VulnCheck

Assigning organization

2026-10-30

What changed

Follow changes
No substantive changes have been recorded here yet. History starts when cve.new observes a change after tracking is enabled; earlier edits are not reconstructed.

Large field values are marked as truncated previews. Original source snapshots remain retained.

References

3 sources
github.com/FOSSBilling/FOSSBilling/security/advisories/GHSA-h7w3-wp25-gf86
vendor-advisoryVulnCheck
github.com/FOSSBilling/FOSSBilling/releases/tag/0.8.9
patchVulnCheck
www.vulncheck.com/advisories/fossbilling-before-login-csrf-via-staff-guest-login-api
third-party-advisoryVulnCheck