CVE-2023-28131Public exploitNetwork attack vector

Account takeover via unverified OAuth return URL

Published Apr 24, 2023 · Updated Feb 4, 2025

OAuth redirect hijacking in Expo AuthSession SDK 45 through 47 allows remote attackers to steal tokens and take over accounts. The auth.expo.io start endpoint stored an attacker-controlled returnUrl in the RU cookie before trust confirmation, then sent the OAuth token to that URL. Exploitation requires a configured AuthSession Redirect Proxy flow and a victim to open a malicious page while signed in to the social provider.

CVSS severity9.6
Critical
EPSS probability23.16%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

OAuth redirect hijacking in Expo AuthSession SDK 45 through 47 allows remote attackers to steal tokens and take over accounts. The auth.expo.io start endpoint stored an attacker-controlled returnUrl in the RU cookie before trust confirmation, then sent the OAuth token to that URL. Exploitation requires a configured AuthSession Redirect Proxy flow and a victim to open a malicious page while signed in to the social provider.

The record

CVE
CVE-2023-28131
Published
Apr 24, 2023
Updated
Feb 4, 2025
Vendor
Expo
Product
Expo AuthSession
Classifications
CWE-522, T1528, T1189
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 24, 2023CVE publishedPublication date reported by the CVE source.
  2. Feb 4, 2025Record 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=All versions prior to SDK 48.* (Affected SDK 45.*, 46.* and 47.*)

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Expo · Expo AuthSessionversion=All versions prior to SDK 48.* (Affected SDK 45.*, 46.* and 47.*)

Published CVSS scores

9.6NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

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

Weakness, pattern, technique

CWE-522Insufficiently Protected Credentials
T1528Steal Application Access Token
T1189Drive-by Compromise

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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