Miggo Logo
Miggo Vulnerability Database
→
CVE-2021-32853

CVE-2021-32853: Erxes vulnerable to Cross-site Scripting

6.1

CVSS Score
3.1

Basic Information

CVE ID
CVE-2021-32853
GHSA ID
GHSA-g9ph-r9hc-34r8
EPSS Score
0.99329%
CWE
CWE-79
Published
2/21/2023
Updated
2/22/2023
KEV Status
No
Technology
TechnologyJavaScript

Technical Details

CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Package NameEcosystemVulnerable VersionsFirst Patched Version
erxesnpm<= 1.0.1

Vulnerability Intelligence
Miggo AIMiggo AI

Miggo AIRoot Cause Analysis

The XSS vulnerability arises from two connected components: 1) The route handler in index.ts directly passes user-controlled query parameter (topicId) to the template without sanitization. 2) The EJS template uses unescaped output (<%-) when embedding this value in a JavaScript context, allowing script injection. The combination of unsanitized input passing and dangerous output interpolation creates an XSS vector. GitHub's security advisory demonstrates concrete exploitation examples using this exact code path.

Vulnerable functions

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

WAF Protection Rules

WAF Rule

*rx*s, *n *xp*ri*n** op*r*tin* syst*m (XOS) wit* * s*t o* plu*ins, is vuln*r**l* to *ross-sit* s*riptin* in *ll v*rsions. T*is r*sults in *li*nt-si** *o** *x**ution. T** vi*tim must *ollow * m*li*ious link or ** r**ir**t** t**r* *rom m*li*ious w** si

Reasoning

T** XSS vuln*r**ility *ris*s *rom two *onn**t** *ompon*nts: *) T** rout* **n*l*r in in**x.ts *ir**tly p*ss*s us*r-*ontroll** qu*ry p*r*m*t*r (topi*I*) to t** t*mpl*t* wit*out s*nitiz*tion. *) T** *JS t*mpl*t* us*s un*s**p** output (<%-) w**n *m****in