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VulnerabilityPublished

CVE-2026-56831: shopperlabs shopper · Improper Input Validation

Affects shopperlabs shopperSource CVE Database V5

0
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Public exploit available · CVSS 6.5 Medium : upgrade to 2.9.0 as a priority.

Data as of 5 Nov 2026, 23:24 UTC

CVSS 3.1 base score
6.5Medium
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.4% chance of exploitation in 30 days – higher than 37% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
CISA SSVC
Exploitation
Proof of concept is public or traded
Automatable
Attackers cannot reliably automate steps 1–4 of the kill chain
Technical impact
Limited control over the software or limited information exposure

CISA SSVC assessment, 2026-09-16.

Patch
Available – fixed in 2.9.0
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

Exploitation evidence

t = 0 is the CVE’s publication on cve.org

  1. Disclosed: evidence found.

    CVE published 15 Sep 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: evidence found.

    CISA SSVC: proof of concept public

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

Timeline

  1. CVE ID reserved

    by GitHub, Inc.

    , 84 days before disclosure

  2. CVE published

    on cve.org

    , t = 0

  3. CISA SSVC assessment

    proof of concept public

    , 21 hours after disclosure

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), CISA SSVC, the Metasploit, Exploit-DB and nuclei-templates index as of 6 Nov 2026.

What to do

Upgrade shopperlabs shopper to 2.9.0.

Affected software

ProductAffectedFixed in
shopperlabsshopperAffected
  • <2.9.0
Fixed in
  • 2.9.0

AI-suggested

Upgrade to shopper version 2.9.0 or later, where this issue is fixed by enforcing positive discount values. No additional mitigation is required once the system is updated.

Description

CVE-2026-56831 is an improper input validation vulnerability in shopperlabs shopper versions prior to 2.9.0. The administrative discounts interface accepts negative fixed_amount discount values, which are persisted and used in price calculations without enforcing that discounts be positive. This flaw causes negative discounts to increase order totals instead of reducing them, leading to incorrect pricing and financial data integrity issues. The vulnerability is fixed in version 2.9.0.

References

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