CVE-2025-5323Public exploitNetwork attack vector

Email verification bypass via reusable signed tokens

Published May 29, 2025 · Updated May 29, 2025

Improper token validation in FOSSASIA Open Event Server 1.19.1 allows remote attackers to verify email addresses they do not control. The send_email_change_user_email function signs a user-selected old address with the same serializer and secret used for registration-verification tokens. An unauthenticated attacker can register the target address, change it to a controlled address, and reuse the resulting token to verify the target address.

CVSS severity6.3
Medium
EPSS probability0.14%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper token validation in FOSSASIA Open Event Server 1.19.1 allows remote attackers to verify email addresses they do not control. The send_email_change_user_email function signs a user-selected old address with the same serializer and secret used for registration-verification tokens. An unauthenticated attacker can register the target address, change it to a controlled address, and reuse the resulting token to verify the target address.

The record

CVE
CVE-2025-5323
Published
May 29, 2025
Updated
May 29, 2025
Vendor
FOSSASIA
Product
Open Event Server
Classifications
CWE-649, CWE-325, T1136
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 29, 2025CVE publishedPublication date reported by the CVE source.
  2. May 29, 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=1.19.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

FOSSASIA · Open Event Serverversion=1.19.1

Published CVSS scores

6.3VulDBCVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
2.6VulDBAV:N/AC:H/Au:N/C:N/I:P/A:N
3.7VulDBCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A: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.

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 exploitPublished

Weakness, pattern, technique

CWE-649Reliance on Obfuscation or Encryption of Security-Relevant Inputs without Integrity Checking
CWE-325Missing Cryptographic Step
T1136Create Account

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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