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CVE Record

CVE-2026-21310: Adobe Commerce | Improper Input Validation (CWE-20)

Adobe Commerce versions 2.4.9-alpha3, 2.4.8-p3, 2.4.7-p8, 2.4.6-p13, 2.4.5-p15, 2.4.4-p16 and earlier are affected by an Improper Input Validation vulnerability that could result in a security feature bypass, with limited impact to integrity. Exploitation of this issue does not require user interaction.

MediumCVSS 5.3Not KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

This flaw can let an unauthenticated remote attacker bypass a security control in affected Adobe Commerce deployments. No user action is required. The documented consequence is limited unauthorized modification, with no stated confidentiality or availability impact.

Executive priority

Schedule prompt remediation through the normal security patch process, prioritizing public commerce systems. The moderate rating reflects limited documented integrity impact, but unauthenticated network reachability increases practical exposure. Escalate if critical business workflows rely on affected security controls.

Technical view

CVE-2026-21310 is improper input validation (CWE-20), scored CVSS 3.1 5.3. Its vector indicates network reachability, low complexity, no privileges, no user interaction, unchanged scope, and low integrity impact. Adobe identifies affected Adobe Commerce release lines and related product versions in APSB26-05.

Likely exposure

Internet-accessible deployments are the principal concern because the CVSS vector is network-based and requires no authentication. Inventory Adobe Commerce, Adobe Commerce B2B, and Magento Open Source installations, then compare exact versions with APSB26-05. The bundle's version encoding is not sufficiently clear to infer every affected range independently.

Exploitation context

Exploitation requires neither credentials nor user interaction and is rated low complexity. However, the supplied sources do not report active exploitation, and the bundle marks the CVE as absent from KEV. No exploit availability evidence is provided.

Researcher notes

The source bundle identifies CWE-20 but does not describe the affected input, bypassed control, detection indicators, or vulnerable code path. Treat product-specific conclusions beyond Adobe's advisory as unverified. Validate versions carefully because the structured affected-version entries appear to encode boundaries rather than plainly enumerated vulnerable releases.

Mitigation direction

  • Apply the appropriate Adobe security update identified in APSB26-05.
  • Prioritize internet-facing stores and administrative or integration endpoints.
  • Restrict unnecessary public access while updates are being validated.
  • Review Adobe guidance for product-specific prerequisites and upgrade paths.

Validation and detection

  • Record exact product, edition, and installed patch level for each deployment.
  • Compare every version directly with the affected and corrected releases in APSB26-05.
  • Confirm updates succeeded through package records and application version reporting.
  • Review security logs for unexplained integrity changes or security-control bypass indicators.
Prepared
Confidence
high
Sources
3

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

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cwe · low confidence lookup

CWE-20: Exact CWE lookup

Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.

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cve · low confidence lookup

CVE-2026-21310 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

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Vulnerability profileCVE Program record
Severity
Medium
CVSS
5.3 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

1CVSS vectors
3Timeline events
1ADP providers
2Source links

SSVC decision data

CISA-ADPCISA Coordinator
Timestamp
Version
2.0.3
Exploitation: noneAutomatable: yesTechnical Impact: partial

CVSS vector scores

1 official score

We collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.

ScoreVersionSeverityVectorExploitImpactSource
5.3CVSS 3.1MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N3.91.4adobe

Vulnerability scoring details

Base CVSS 3.1 score

5.3Medium
CVSS 3.1 vector shape for CVE-2026-21310Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

Vulnerability timeline

Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.

  1. CVE reservedCVE Program

    The CVE ID was reserved by the assigning CNA.

  2. CVE publishedCVE Program

    The CVE record was published.

  3. CVE updatedCVE Program

    The CVE record metadata indicates this as the latest update time.

ADP provider summaries

CISA-ADPCISA ADP Vulnrichment
other:ssvc

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
AdobeAdobe Commerce0, 2.4.9-beta1, 2.4.8-p4, 2.4.7-p9, 2.4.6-p14, 2.4.5-p16, 2.4.4-p17unaffected
AdobeAdobe Commerce B2B0, 1.5.3-beta1, 1.5.2-p4, 1.4.2-p9, 1.3.5-p14, 1.3.4-p16, 1.3.3-p17unaffected
AdobeMagento Open Source0, 2.4.9-beta1, 2.4.8-p4, 2.4.7-p9, 2.4.6-p14, 2.4.5-p16unaffected
Weakness

CWE details

CWE-20

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.