CVE-2026-43930Public exploitNetwork attack vector

Duplicate session issuance via concurrent SMS OTP reuse

Published May 12, 2026 · Updated May 12, 2026

Race condition in Parse Server before 8.6.76 and 9.0.0 through 9.9.0-alpha.1 allows remote authenticated users to duplicate session tokens. The SMS MFA path stores its single-use OTP as a string, but the update's optimistic-lock guard covered only array-valued authentication data, allowing concurrent requests to consume the same value. Exploitation requires the victim's password, interception of the active SMS OTP, and a successful race against another login request.

CVSS severity2.1
Low
EPSS probability0.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Race condition in Parse Server before 8.6.76 and 9.0.0 through 9.9.0-alpha.1 allows remote authenticated users to duplicate session tokens. The SMS MFA path stores its single-use OTP as a string, but the update's optimistic-lock guard covered only array-valued authentication data, allowing concurrent requests to consume the same value. Exploitation requires the victim's password, interception of the active SMS OTP, and a successful race against another login request.

The record

CVE
CVE-2026-43930
Published
May 12, 2026
Updated
May 12, 2026
Vendor
Parse Platform
Product
Parse Server
Classifications
CWE-362, T1078
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 12, 2026CVE publishedPublication date reported by the CVE source.
  2. May 12, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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

  1. Affected versionversion=< 8.6.76
  2. Affected versionversion=>= 9.0.0, < 9.9.0-alpha.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Parse Platform · Parse Serverversion=< 8.6.76; version=>= 9.0.0, < 9.9.0-alpha.2

Published CVSS scores

2.1GitHubCVSS:4.0/AV:N/AC:H/AT:N/PR:H/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N

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.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-362Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
T1078Valid Accounts

Public exploit references

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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