CVE-2026-3455 json
mailparser vulnerable to Cross-site Scripting
published 2026-03-03 8 mo ago modified 2026-06-17 4 mo ago also GHSA-7gmj-h9xc-mcxc , EUVD-2026-9279
- cvss
- 6.1
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.4%
- EPSS 0.4% chance of exploitation in 30 days, percentile 30%
- public exploits
- 0
- none known
Summary
Versions of the package mailparser before 3.9.3 are vulnerable to Cross-site Scripting (XSS) via the textToHtml() function due to the improper sanitisation of URLs in the email content. An attacker can execute arbitrary scripts in victim browsers by adding extra quote " to the URL with embedded malicious JavaScript code.
Patch / fix
CISA SSVC
- Exploitation
- Proof of concept is public
- Automatable
- no
- Technical impact
- partial
- Assessed
- 8 mo ago
Exploit prediction
0.36% chance of exploitation in the next 30 days, higher than 30% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- gist.github.com https://gist.github.com/hayageek/7fcb225e3b1ea9a341d560403fbb585a referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 4.0 | 5.1 | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:L/VA:N/SC:L/SI:L/SA:N/E:P |
| CNA | 3.1 | 6.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N/E:P |
| CNA | 4.0 | 2.0 | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:L/VA:N/SC:L/SI:L/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X |
| CNA | 3.1 | 6.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N |
| GitHub | 3.1 | 6.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| npm | mailparser | <3.9.3 |
3.9.3 |
Affected products
- n/a mailparser
Classification
- Weakness
-
- CWE-79 Improper Neutralization of Input During Web Page Generation
References
-
github.com
/nodemailer/mailparser/commit/921a67df4cfb38f0b411037d7b26fbd4d5411b08
web, patch
-
gist.github.com
/hayageek/7fcb225e3b1ea9a341d560403fbb585a
web, exploit, third-party-advisory
-
security.snyk.io
/vuln/SNYK-JS-MAILPARSER-15204032
web, third-party-advisory
-
github.com
/nodemailer/mailparser/issues/412
web, issue-tracking
-
nvd.nist.gov
/vuln/detail/CVE-2026-3455
advisory
-
github.com
/nodemailer/mailparser
package
Sources
- CVE List CVE-2026-3455
- GitHub Advisory GHSA-7gmj-h9xc-mcxc
- NVD CVE-2026-3455
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.