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CVE-2020-13869

CVE-2020-13869: Comments plugin stored Cross-site Scripting via a guest name

5.4

CVSS Score
3.1

Basic Information

CVE ID
CVE-2020-13869
GHSA ID
GHSA-jhhf-c849-3rh2
EPSS Score
0.43188%
CWE
CWE-79
Published
5/24/2022
Updated
4/24/2024
KEV Status
No
Technology
TechnologyPHP

Technical Details

CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Package NameEcosystemVulnerable VersionsFirst Patched Version
verbb/commentscomposer< 1.5.51.5.5

Vulnerability Intelligence
Miggo AIMiggo AI

Miggo AIRoot Cause Analysis

The vulnerability stems from improper neutralization of guest name input (CWE-79). The changelog explicitly mentions fixing XSS in guest names in v1.5.5, indicating pre-patch versions lacked sanitization at both input handling and output rendering stages. Craft CMS plugins typically process user input in service classes and render via Twig templates, making these the most likely vulnerable points. The high confidence comes from the advisory's specific mention of guest name as the attack vector and standard XSS prevention patterns in web applications.

Vulnerable functions

Only Mi**o us*rs **n s** t*is s**tion

WAF Protection Rules

WAF Rule

*n issu* w*s *is*ov*r** in t** *omm*nts plu*in ***or* *.*.* *or *r**t *MS. T**r* is stor** XSS vi* * *u*st n*m*.

Reasoning

T** vuln*r**ility st*ms *rom improp*r n*utr*liz*tion o* *u*st n*m* input (*W*-**). T** ***n**lo* *xpli*itly m*ntions *ixin* XSS in *u*st n*m*s in v*.*.*, in*i**tin* pr*-p*t** v*rsions l**k** s*nitiz*tion *t *ot* input **n*lin* *n* output r*n**rin* st