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TI-2026-70556 Aliases CVE-2026-108568GHSA-p5x9-rh29-4r44

Data authenticity flaw in InstantSoft icms2 PayPal billing

Priority MEDIUM 57CWE-345Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Security bypass
Confidentiality · integrity · availability
None · Low · None
Fix status
No fix listed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-345.

Summary

InstantSoft icms2 up to 2.18.2 is affected. The validatePaypalOrder function in the Billing Module's paypal.php file does not sufficiently verify the authenticity of data passed in the bid and sig arguments (CWE-345). A remote attacker with low privileges can exploit this, and a public exploit has been disclosed.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

Description from the CNA

A vulnerability was determined in InstantSoft icms2 up to 2.18.2. The affected element is the function validatePaypalOrder of the file system/controllers/billing/actions/paypal.php of the component Billing Module. Executing a manipulation of the argument bid/sig can lead to insufficient verification of data authenticity. The attack may be launched remotely. The exploit has been publicly disclosed and may be utilized. The vendor was contacted early about this disclosure but did not respond in any way.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00133 2nd percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
instantsofticms22.18.0; 2.18.1; 2.18.2—No fix listedCNA
  • icms2 Vendorinstantsoft Affected 2.18.0; 2.18.1; 2.18.2 Fixed in — No fix listed CNA

CPE names CNA · 1

CPEVersionsRoleVendor
cpe:2.3:a:instantsoft:icms2:*:*:*:*:*:*:*:*——instantsoft
  • cpe:2.3:a:instantsoft:icms2:*:*:*:*:*:*:*:* Versions — — ·instantsoft

Remediation

The sources list no fixed version for icms2.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

Timeline

  1. 2026-10-11 Threatist record created from CVE-2026-108568
  2. 2026-10-11 Alias added: GHSA-p5x9-rh29-4r44
  3. 2026-10-13 CISA SSVC decision points changed
  4. 2026-10-13 Priority changed: LOW → MEDIUM

References

—

  • TI-2023-03877 SQL Injection in instantsoft/icms2 CVSS 3.1CRITICAL 9.1
  • TI-2024-20589 SQL injection in index_chart_data action CVSS 3.1HIGH 7.2
  • TI-2023-04538 SQL Injection in instantsoft/icms2 CVSS 3.1HIGH 7.2
  • TI-2025-36697 InstantCMS vulnerable to Server-Side Request Forgery via package installer CVSS 3.1HIGH 7.2
  • TI-2023-04291 Cross-site Scripting (XSS) - Reflected in instantsoft/icms2 CVSS 3.1MEDIUM 6.1
  • TI-2026-39443 InstantCMS has Remote Code Execution in package installer CVSS 3.1MEDIUM 5.5
See all 25 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences