Comments plugin stored Cross-site Scripting (XSS) via an asset volume name

published 2020-06-05 6y ago modified 2026-06-17 4mo ago also GHSA-69ww-wv3j-mhg4 , EUVD-2022-2766

cvss: 5.4; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 0.5%; EPSS 0.5% chance of exploitation in 30 days, percentile 45%
public exploits: 0; none known

An issue was discovered in the Comments plugin before 1.5.5 for Craft CMS. There is stored XSS via an asset volume name.

Patch / fix

fixed in 2

packagist verbb/comments 1.5.5
verbb comments 1.5.5

Is CVE-2020-13870 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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Exploit prediction

0.54% chance of exploitation in the next 30 days, higher than 45% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by	version	score	vector
NVD	3.1	5.4	CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
NVD	2.0	3.5	AV:N/AC:M/Au:S/C:N/I:P/A:N
GitHub	3.1	5.4	CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

Affected packages

ecosystem	package	affected	fixed in
packagist	verbb/comments	<1.5.5	1.5.5

Classification

Weakness

CWE-79 Improper Neutralization of Input During Web Page Generation

References

github.com /verbb/comments/blob/craft-3/CHANGELOG.md#155---2020-05-28-critical
web, release-notes, third-party-advisory
nvd.nist.gov /vuln/detail/CVE-2020-13870
advisory
github.com /verbb/comments
package

Sources

Fencer Intel 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.