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CVE-2026-21129 Samsung Mobile CVE debrief

CVE-2026-21129 is a medium-severity vulnerability in Samsung Checkout, specifically in the GuestCreditCardRegisterActivity, which allows local attackers to launch an arbitrary activity with Samsung Checkout privileges. This vulnerability requires verification of affected versions and prompt remediation to prevent potential local attacks. Defenders should assess exposure and prioritize verification and remediation efforts. The vulnerability is due to improper input validation, and defenders should review and restrict local attacker access to Samsung Checkout.

Vendor
Samsung Mobile
Product
Samsung Checkout
CVSS
MEDIUM 5.1
CISA KEV
Not listed in stored evidence
Original CVE published
2026-10-12
Original CVE updated
2026-10-12
Advisory published
2026-10-12
Advisory updated
2026-10-12

Who should care

Defenders responsible for Samsung Checkout deployments should assess exposure and prioritize verification and remediation efforts. This includes verifying affected versions, reviewing and restricting local attacker access, and monitoring for suspicious activity related to Samsung Checkout. Defenders should also review compensating controls for exposed systems while remediation is scheduled and verified.

Why it matters

CVE-2026-21129 is a medium-severity vulnerability in Samsung Checkout that requires verification of affected versions and prompt remediation to prevent potential local attacks.

  • Local attackers may launch arbitrary activities with Samsung Checkout privileges
  • Verification of affected versions and remediation priority are necessary

Technical summary

The vulnerability is due to improper input validation in the GuestCreditCardRegisterActivity of Samsung Checkout prior to version 5.1.03.1, allowing local attackers to launch an arbitrary activity with Samsung Checkout privileges. This vulnerability requires defenders to verify affected Samsung Checkout versions and upgrade to version 5.1.03.1 or later. The CVE record and source item provide details on the vulnerability, but additional verification is needed to confirm affected versions and potential impact.

Defensive priority

Defenders should prioritize verifying affected Samsung Checkout versions and upgrading to version 5.1.03.1 or later.

Recommended defensive actions

  • Verify Samsung Checkout version and upgrade to 5.1.03.1 or later if necessary
  • Review and restrict local attacker access to Samsung Checkout
  • Monitor for suspicious activity related to Samsung Checkout

Evidence notes

The CVE record and source item provide details on the vulnerability, but additional verification is needed to confirm affected versions and potential impact.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-21129 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-21129

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-21129 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-21129

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

  • CVE-2026-21129

    Unverified legacy reference

    URL: https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/21xxx/CVE-2026-21129.json

    cve_program_cvelist_v5

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.