ZDF
Sign inSign up

Vulnerabilities

Vulnerability · CVE-2026-40495

FOSSBilling is a free, open-source billing and client management system.

Published Jun 3, 2026 · catalog updated Jul 22, 2026 · FOSSBilling is a free,

Check if you run it

No confirmed exploitation is on record for CVE-2026-40495. EPSS is 0.47%. Act only if a listed version of FOSSBilling is a free, is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (FOSSBilling is a free,).
  • No version range is stored. A customer cannot check an installed version against this record.
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Medium6.9
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.47%
Remediation
Advisory link
Affected products
See sources for product scope

FOSSBilling is a free, open-source billing and client management system. Versions prior to 0.8.0 leak the exact system version through asset cache buster parameters in HTML output, bypassing the security setting. The FOSSBilling version is embedded in the query string of every and tag generated by the and Twig filters. This information is visible to all visitors — including unauthenticated guests — on every page, regardless of whether the setting is enabled. The HTTP header and the API endpoint correctly honour the setting, but the asset cache buster parameters were overlooked. Knowledge of the exact FOSSBilling version makes it significantly easier for malicious actors to identify known vulnerabilities applicable to a given installation and craft targeted exploits. While not a direct vulnerability on its own, it undermines the intended protection offered by the setting and facilitates reconnaissance. Version 0.8.0 contains a patch. There is no practical workaround that removes the version from asset URLs without modifying source code.

No affected version ranges are stored yet. Use the vendor advisory before you decide this record does not apply.

How to fix CVE-2026-40495

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-40495. EPSS is 0.47%. Act only if a listed version of FOSSBilling is a free, is installed.

Which versions are affected?

Affected version ranges are not on this record. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-200: Exposure of Sensitive Information. EPSS 0.47%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Jun 3, 2026 · NIST NVD

    Detected

    FOSSBilling is a free, open-source billing and client management system. Versions prior to 0.8.0 leak the exact system version through asset cache buster parameters in HTML output, bypassing the security setting. The FOSSBilling version is embedded in the query string of every and tag generated by the and Twig filters. This information is visible to all visitors — including unauthenticated guests

  2. Jul 22, 2026 · NIST NVD

    Updated

    FOSSBilling is a free, open-source billing and client management system. Versions prior to 0.8.0 leak the exact system version through asset cache buster parameters in HTML output, bypassing the security setting. The FOSSBilling version is embedded in the query string of every and tag generated by the and Twig filters. This information is visible to all visitors — including unauthenticated guests

Sources

  • CVE.orgVulnerability recordCVE-2026-40495

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-40495

    30-day exploitation probability 0.5%

    first.org
  • NIST NVDVulnerability recordCVE-2026-40495

    FOSSBilling is a free, open-source billing and client management system. Versions prior to 0.8.0 leak the exact system version through asset cache buster parameters in HTML output, bypassing the security setting. The FOSSBilling version is embedded in the qu

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.