CVE-2026-31824Network attack vector

Promotion limit bypass via stale counter race

Published Mar 10, 2026 · Updated Mar 10, 2026

TOCTOU in promotion enforcement in affected Sylius releases allows remote attackers to exceed usage limits through concurrent checkouts. Eligibility checks read stale Doctrine entity counters before OrderPromotionsUsageModifier later writes absolute values without locking or atomic increments. Unauthenticated access to the order-completion API is sufficient to redeem limited promotions or coupons repeatedly, causing unauthorized discounts.

CVSS severity8.2
High
EPSS probability0.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

TOCTOU in promotion enforcement in affected Sylius releases allows remote attackers to exceed usage limits through concurrent checkouts. Eligibility checks read stale Doctrine entity counters before OrderPromotionsUsageModifier later writes absolute values without locking or atomic increments. Unauthenticated access to the order-completion API is sufficient to redeem limited promotions or coupons repeatedly, causing unauthorized discounts.

The record

CVE
CVE-2026-31824
Published
Mar 10, 2026
Updated
Mar 10, 2026
Vendor
Sylius
Product
Sylius
Classifications
CWE-367, CWE-362, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 10, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 10, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=>= 1.10.0, < 1.10.16
  2. Affected versionversion=>= 1.11.0, < 1.11.17
  3. Affected versionversion=>= 1.12.0, < 1.12.23
  4. Affected versionversion=>= 1.13.0, < 1.13.15
  5. Affected versionversion=>= 1.14.0, < 1.14.18
  6. Affected versionversion=< 1.9.12
  7. Affected versionversion=>= 2.0.0, < 2.0.16
  8. Affected versionversion=>= 2.1.0, < 2.1.12
  9. Affected versionversion=>= 2.2.0, < 2.2.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Sylius · Syliusversion=>= 1.10.0, < 1.10.16; version=>= 1.11.0, < 1.11.17; version=>= 1.12.0, < 1.12.23; version=>= 1.13.0, < 1.13.15; version=>= 1.14.0, < 1.14.18; version=< 1.9.12; version=>= 2.0.0, < 2.0.16; version=>= 2.1.0, < 2.1.12; version=>= 2.2.0, < 2.2.3

Published CVSS scores

8.2GitHub CNACVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-367Time-of-check Time-of-use (TOCTOU) Race Condition
CWE-362Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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