Plunk has Stored Cross-Site Scripting (XSS) via SVG File Upload

published 2026-03-11 7 mo ago modified 2026-06-17 4 mo ago also EUVD-2026-11334

cvss: 5.4; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.2%; EPSS 0.2% chance of exploitation in 30 days, percentile 5%
public exploits: 0; none known

Plunk is an open-source email platform built on top of AWS SES. Prior to 0.7.1, Plunk's image upload endpoint accepted SVG files, which browsers treat as active documents capable of executing embedded JavaScript, creating a stored XSS vulnerability. This vulnerability is fixed in 0.7.1.

Patch / fix

fixed in 1

useplunk plunk 0.7.1

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: partial
Assessed: 7 mo ago (2026-03-12)

Exploit prediction

0.16% chance of exploitation in the next 30 days, higher than 5% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	5.4	CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

Affected products

useplunk plunk

Classification

Weakness

CWE-79 Improper Neutralization of Input During Web Page Generation

References

github.com /useplunk/plunk/security/advisories/GHSA-69jg-7493-cx5x
vendor-advisory

Sources

CVE List CVE-2026-32095
NVD CVE-2026-32095

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.

Summary