CVE-2026-55383
HIGH 8.2InvoiceShelf is an open-source web & mobile app that helps track expenses, payments and create professional invoices and estimates. Prior to version 2.4.0, InvoiceShelf public customer invoice, estimate, and payment routes use an EmailLog token's numeric mailable_id without verifying mailable_type, and the JSON handlers do not enforce EmailLog::isExpired. A token issued for one document type can therefore disclose a different company's document when numeric identifiers collide, and an expired token can remain usable on the JSON routes GET /customer/invoices/{email_log:token}, GET /customer/estimates/{email_log:token}, and GET /customer/payments/{email_log:token}. View handlers can also mark a mismatched invoice or estimate as viewed and send a notification. This issue is fixed in version 2.4.0.
Severe if exploited (CVSS 8.2), but no known exploitation and low modeled probability. Patch on a normal cadence.
Exploitation likelihood
0.4%chance of exploitation in 30 days · 36th percentile
Impact if exploited
8.2CVSS 3.1 · HIGH
- ConfidentialityHigh
- IntegrityLow
- AvailabilityNone
What an attacker needs
- ✓Access: Reachable over the network — no local access needed
- ✓Privileges: No account or privileges required
- ✓User interaction: No user interaction needed
- ✓Complexity: No special conditions — reliably repeatable
✓ lowers the bar for an attacker · ⚠ raises it
Proof of concept
No public PoC is currently catalogued.
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Data snapshot:
Weakness (CWE)
- CWE-285: : Improper Authorization
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N
References and research data (JSON)
All CVSS metrics
- HIGH 8.2 v3.1 · CNA Primary
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N - HIGH 8.2 v3.1 · NVD Secondary
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N
References
Exploit-tagged references (not proof of a PoC)
- https://github.com/InvoiceShelf/InvoiceShelf/security/advisories/GHSA-73q7-2953-8gvx CVE record · GitHub_M · Updated 2026-10-14T19:23:33.527Z
CVE record · CISA-ADP · Updated 2026-10-14T19:43:41.543Z
NVD · CVE-2026-55383 · Updated 2026-10-15T21:08:49.703
Advisories
- https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-101610 EUVD · EUVD-2026-101610
Technical & other
- https://github.com/InvoiceShelf/InvoiceShelf/pull/662 CVE record · GitHub_M · Updated 2026-10-14T19:23:33.527Z
NVD · CVE-2026-55383 · Updated 2026-10-15T21:08:49.703 - https://github.com/InvoiceShelf/InvoiceShelf/commit/5839d8385debf379644f55e773639e1c7e673163 CVE record · GitHub_M · Updated 2026-10-14T19:23:33.527Z
NVD · CVE-2026-55383 · Updated 2026-10-15T21:08:49.703 - https://github.com/InvoiceShelf/InvoiceShelf/releases/tag/2.4.0 CVE record · GitHub_M · Updated 2026-10-14T19:23:33.527Z
NVD · CVE-2026-55383 · Updated 2026-10-15T21:08:49.703