CVE-2026-47677: FacturaScripts: Account takeover of any 2FA-enabled user

Should you act?

Critical and remotely reachable

No known exploitation yet, but it is network-reachable without credentials. This signal is computed from CISA KEV, EPSS and CVSS data; it is not an editorial verdict.

• No confirmed exploitation. It is not in CISA’s KEV catalog. That can change quickly after a public write-up; re-check if you are affected.
• Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.
• Only applies if your dependency tree includes facturascripts/facturascripts (Composer (PHP)) <= 2026.2, fixed in 2026.3. Check your lockfile, including transitive dependencies.

What it is

From the GitHub advisory

Authentication bypass in FacturaScripts: /login?action=two-factor-validation accepts brute-forceable TOTP without password or CSRF protection

Summary

Core/Controller/Login.php::twoFactorValidationAction() accepts an unauthenticated POST containing only fsNick and fsTwoFactorCode. If the TOTP value matches, the server issues a full fsNick + fsLogkey session cookie pair. The handler:

1. Does not verify the password — the user is not required to have just completed loginAction. 2. Does not call validateFormToken() — no CSRF token is required (every other action handler in the same file does call it). 3. Does not call userHasManyIncidents() before processing — loginAction and changePasswordAction both check this guard before doing work; the 2FA handler only writes to the incident list after a failure, and the incident list is consulted by loginAction / changePasswordAction but not by the 2FA handler itself. The endpoint therefore has no rate-limiting at all.

Combined with TwoFactorManager::VERIFICATIONWINDOW = 8 (google2fa default is 1), 17 distinct six-digit codes are valid simultaneously and each remains valid for ~4 minutes. The expected number of guesses to land a valid code is

Weakness type: CWE-287.

Product: facturascripts/facturascripts (Composer (PHP)) · Published: 2026-07-13

Affected and fixed versions

Severity scores

• Attack vector: network (remotely reachable)
• Attack complexity: low
• Attack requirements: none
• Privileges required: none (no login)
• User interaction: none

CVSS measures how bad a flaw is if exploited, not how likely exploitation is. Read it next to the exploitation data below.

Exploitation and urgency

• CISA KEV: not listed (no confirmed in-the-wild exploitation known to CISA).

Timeline

• 2026-07-13 — GitHub-reviewed advisory GHSA-c67f-gmxw-mj93 published (critical)

Sources and references

Original sources first. Version and fix details should always be confirmed against the vendor or project advisory.

Vulnerability records

1. GitHub Advisory GHSA-c67f-gmxw-mj93 github.com
2. CVE.org record CVE-2026-47677 cve.org
3. NVD entry CVE-2026-47677 nvd.nist.gov

Other references from the CVE record and advisory

1. github.com github.com
2. github.com github.com

Critical Composer (PHP) advisories · Today’s Security Digest