CVE-2025-0953Network attack vector

Stored XSS via unescaped email-log output

Published Feb 22, 2025 · Updated Jun 4, 2026

Stored XSS in YayCommerce SMTP for Sendinblue – YaySMTP 1.2 and earlier allows remote attackers to execute scripts via email logs. The email-log path stores attacker-controlled message fields without sufficient sanitization and renders them in log pages without context-appropriate escaping. No authentication is required to seed a malicious log entry, but a user must open the affected page; execution occurs in that viewer's browser.

CVSS severity6.1
Medium
EPSS probability0.35%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in YayCommerce SMTP for Sendinblue – YaySMTP 1.2 and earlier allows remote attackers to execute scripts via email logs. The email-log path stores attacker-controlled message fields without sufficient sanitization and renders them in log pages without context-appropriate escaping. No authentication is required to seed a malicious log entry, but a user must open the affected page; execution occurs in that viewer's browser.

The record

CVE
CVE-2025-0953
Published
Feb 22, 2025
Updated
Jun 4, 2026
Vendor
YayCommerce
Product
SMTP for Sendinblue – YaySMTP
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 22, 2025CVE publishedPublication date reported by the CVE source.
  2. Jun 4, 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=0 <=1.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

YayCommerce · SMTP for Sendinblue – YaySMTPversion=0 <=1.2

Published CVSS scores

6.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
7.2WordfenceCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/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 exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1059.007Command and Scripting Interpreter: JavaScript/JScript

Public exploit references

No public exploit references are available in this record.

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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