CVE-2025-1015Network attack vector

Unprivileged JavaScript execution via unsanitized address book links

Published Feb 4, 2025 · Updated Apr 13, 2026

Cross-site scripting in Mozilla Thunderbird ESR before 128.7 and Thunderbird before 135 allows remote attackers to run unprivileged JavaScript. Address Book URI fields preserve attacker-supplied links without sanitization when an address book is exported and imported. Execution requires a user to import the crafted address book and click its link, which opens a web page inside Thunderbird with unprivileged script rights.

CVSS severity5.4
Medium
EPSS probability1.37%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cross-site scripting in Mozilla Thunderbird ESR before 128.7 and Thunderbird before 135 allows remote attackers to run unprivileged JavaScript. Address Book URI fields preserve attacker-supplied links without sanitization when an address book is exported and imported. Execution requires a user to import the crafted address book and click its link, which opens a web page inside Thunderbird with unprivileged script rights.

The record

CVE
CVE-2025-1015
Published
Feb 4, 2025
Updated
Apr 13, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-79, T1204.002
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 4, 2025CVE publishedPublication date reported by the CVE source.
  2. Apr 13, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

5.4CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/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 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 exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1204.002User Execution: Malicious File

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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