CVE-2023-3521 — Cross-site Scripting (XSS) - Reflected in GitHub repository fossbilling/fossbill

Cross-site Scripting (XSS) - Reflected in GitHub repository fossbilling/fossbilling prior to 0.5.4.

01What is this vulnerability?

Cross-site Scripting (XSS) - Reflected in GitHub repository fossbilling/fossbilling prior to 0.5.4.

02Affected products

Vendor	Product	Versions
fossbilling	fossbilling/fossbilling	unspecified

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Open the Sigma generator with a pre-filled prompt for this CVE to draft a starting detection in your stack of choice:

Open in Sigma generator →

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2023-07-06T01:45:39.229Z
• Last modified: 2024-10-31T17:52:07.733Z

09References

• huntr.dev — https://huntr.dev/bounties/76a3441d-7f75-4a8d-a7a0-95a7f5456eb0
• github.com — https://github.com/fossbilling/fossbilling/commit/5eb516d4ebcb764db1b2edf9c8d053…