VulnSocial

CVE-2026-27604Disclosure

LOWCVSS 10.0 · CRITICAL

Signal is active with 1 mentions in latest observed window

Immediate actions

  • Patch affected systems immediately

Recommended action window: Monitor and triage in normal cycle

NVD description

FOSSBilling is a free, open-source billing and client management system. Starting in version 0.5.4 and prior to version 0.8.0, an authorization bypass in the API role handling allows unauthenticated access to privileged `/api/system/*` endpoints. Because `system` resolves to the cron admin identity, attackers can invoke admin API methods without valid credentials, session, or CSRF token. Version 0.8.0 patches the issue. Some workarounds are available. Block external access to `/api/system/*` at reverse proxy/WAF, restrict API access by trusted source IPs only (`api.allowed_ips`), rotate all admin/client API tokens immediately, invalidate active sessions and reset high-privilege credentials, and/or review API request logs for suspicious `/api/system/` access and treat as potential incident.

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0.5/ 10 priority

Sources & remediation

Other references
Weakness type (CWE)
CWE-200CWE-306CWE-862CWE-863

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

AVAILABLE

Momentum

STABLE

Threat summary

  • Patch or workaround signal is available
  • 2 mentions across 2 observed days
  • Momentum state: stable

What's happening

  • Patch or workaround mentioned in 1 signal
  • Technical details provided in 2 signals
  • Disclosure: 2 classified signals
  • Peaked 1d ago at 1 mentions (2026-06-24); latest day: 1
  • 2 total mentions across 2 days

Deep dive

Activity timeline2 mentions / 2d
00111Mentions · 2026-06-24: 1Mentions · 2026-10-12: 1Patch / Workaround · 2026-06-24: 1Technical Details · 2026-06-24: 1Technical Details · 2026-10-12: 106-2410-12
Signal classification1 categories
Disclosure
2100.0%
Referenced assets2 URLs
Full discourse2 posts
  • pdnuclei-bot@pdnuclei_bot
    Disclosure

    🚨 CVE-2026-27604 - critical 🚨 FOSSBilling 0.5.4-0.7.x - Unauthenticated System API Role Authorization Bypass > FOSSBilling versions 0.5.4 through 0.7.x contain an authorization bypass in API role ... 👾 https://cloud.projectdiscovery.io/library/CVE-2026-27604 @pdnuclei #Nuc...

    Post summary

    The post identifies CVE-2026-27604 as an unauthenticated API role authorization bypass in specified FOSSBilling versions. It provides no PoC, exploit, active exploitation report, or remediation guidance.

    00041442
    1.4K followersView on X
  • SecAlerts@SecAlertsCo
    Disclosure

    🧾 CVE-2026-27604: FOSSBilling has a CVSS 10 auth bypass letting unauthenticated users hit privileged admin API functions. Affects v0.5.4 through pre-0.8.0. Upgrade now. #infosec #cybersecurity https://secalerts.co/vulnerability/CVE-2026-27604?utm_campaign=x https://t.co/BhrtWHezIr

    Post summary

    The note highlights a severe authentication bypass in FOSSBilling, providing technical details and urging an upgrade, but makes no claim of current exploitation or a PoC.

    0001098
    842 followersView on X

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