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CVE-2026-102803 Joomla Extension - j2commerce.com - Gift voucher and single-use coupon could pay for more than one order in J2Store 6.0.0 - 6.6.5

6.0 mediumEPSS 0.2%

Medium (6.0) in j2commerce.com j2store extension for joomla. EPSS 0.2% estimated probability of exploitation activity in the next 30 days.

On this page
Joomla Extension - j2commerce.com - Gift voucher and single-use coupon could pay for more than one order in J2Store 6.0.0 - 6.6.5 - A logged-in customer could redeem a single gift voucher, or a single-use coupon (`max_uses` / `max_customer_uses` = 1), on more than one order. By starting several checkout sessions and carrying each to the confirm step before submitting any of them, every order independently saw the voucher's full balance or the coupon's unused slot, because the balance/usage calculations and the final placement check both only looked at orders that had already left the "New" state.

Severity

CVSS 4.0

6.0 medium
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
EPSS
0.2% estimated probability of exploitation activity in the next 30 days; 12th percentile. Scored 2026-11-13. A forecast for this CVE across the internet, not for your own systems.
CISA's assessment (SSVC)
Exploitation: none · Automatable: no · Technical impact: partial, assessed 2026-11-12. From CISA's Vulnrichment in the CVE List: whether it is exploited, whether exploiting it can be automated, and how much control it gives.
CWE
CWE-367 Time-of-check Time-of-use (TOCTOU) Race Condition
Published
Modified
Assigned by
Joomla (CNA)
NVD analysis
Awaiting analysis
Record from
the NVD, synced

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Affected

  • j2commerce.com:j2store extension for joomla

Versions

From the CNA's record in the CVE List.

ProductAffected
j2commerce.com J2Store extension for Joomla6.0.0-6.6.5

Attack patterns (CAPEC)

  • CAPEC-27 Leveraging Race Conditions via Symbolic Links Likelihood: Medium · Severity: High
  • CAPEC-29 Leveraging Time-of-Check and Time-of-Use (TOCTOU) Race Conditions Likelihood: High · Severity: High

The attack patterns MITRE's CAPEC relates to this record's weaknesses, as MITRE names them. Credits.

References

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