Hexo - Stored XSS

published 2021-11-30 4 y ago modified 2026-06-17 4 mo ago also GHSA-q54r-r9pr-w7qv , EUVD-2021-2565

cvss: 5.0; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.3%; EPSS 0.3% chance of exploitation in 30 days, percentile 27%
public exploits: 0; none known

Hexo versions 0.0.1 to 5.4.0 are vulnerable against stored XSS. The post “body” and “tags” don’t sanitize malicious javascript during web page generation. Local unprivileged attacker can inject arbitrary code.

Patch / fix

fixed in 1 links 2

npm hexo 6.0.0

github.com/hexojs/hexo@5170df2 commit
github.com/hexojs/hexo#4750 pull request

CISA SSVC

Exploitation: Proof of concept is public
Automatable: no
Technical impact: partial
Assessed: 18 mo ago (2025-04-30)

Exploit prediction

0.34% chance of exploitation in the next 30 days, higher than 27% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	5.0	CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
NVD	3.1	4.6	CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
NVD	2.0	1.9	AV:L/AC:M/Au:N/C:N/I:P/A:N
GitHub	3.1	4.6	CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

Affected packages

ecosystem	package	affected	fixed in
npm	hexo	>=0.0.1, <6.0.0	6.0.0

Affected products

Hexo Hexo

Classification

Weakness

CWE-79 Improper Neutralization of Input During Web Page Generation

References

github.com /hexojs/hexo/commit/5170df2d3fa9c69e855c4b7c2b084ebfd92d5200
web, patch, third-party-advisory
github.com /hexojs/hexo/pull/4750
web
whitesourcesoftware.com /vulnerability-database/CVE-2021-25987
web, third-party-advisory
nvd.nist.gov /vuln/detail/CVE-2021-25987
advisory
github.com /hexojs/hexo/issues/4838
web
github.com /hexojs/hexo
package

Sources

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