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CVE-2026-121553— Cotonti through 1.0.0 Predictable Validation Tokens via md5(microtime())

Quick assessment

Affected
cotonti cotonti
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Cotonti 1.0.0 及更早版本在使用 生成注册和邮箱更改的验证令牌时存在安全缺陷，允许攻击者通过预测令牌来绕过邮箱所有权验证。攻击者可以从 HTTP 响应头的 字段推知令牌的生成时间，并在离线环境中计算候选令牌。随后，他们将这些令牌提交至 中的验证处理程序，以激活其未控制的账户或确认其未拥有的邮箱地址。

CVSS 4.8 · Medium EPSS 0.36% · P29

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
cotonti cotonti ≤ 1.0.0 affected
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I. Basic Information for CVE-2026-121553

Vulnerability Information
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Vulnerability Title
Cotonti through 1.0.0 Predictable Validation Tokens via md5(microtime())
Source: CVE Program / CVE List V5
Vulnerability Description
Cotonti through 1.0.0 generates registration and email-change validation tokens with md5(microtime()), allowing attackers to bypass email-ownership verification by predicting tokens. Attackers can derive the generation time from the HTTP Date header and compute candidate tokens offline. They then submit these tokens to the users.register.php validate handler to activate accounts or confirm email addresses they do not control.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
使用具有密码学弱点缺陷的PRNG
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
cotonti cotonti 0 ~ 1.0.0 -

II. Public POCs for CVE-2026-121553

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-121553

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Vendor Pages for CVE-2026-121553 (1)

Other References for CVE-2026-121553 (6)

IV. Related Vulnerabilities

Same product: cotonti
Same vendor: cotonti
Same weakness: CWE-338