markdown-pdf 11.0.0 - Local File Read via Server Side XSS

published 2023-04-04 3 y ago modified 2026-06-17 4 mo ago also GHSA-qghr-877h-f9jh , EUVD-2023-1375

cvss: 8.2; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.6%; EPSS 0.6% chance of exploitation in 30 days, percentile 48%
public exploits: 0; none known

markdown-pdf version 11.0.0 allows an external attacker to remotely obtain arbitrary local files. This is possible because the application does not validate the Markdown content entered by the user.

CISA SSVC

Exploitation: Proof of concept is public
Automatable: no
Technical impact: partial
Assessed: 20 mo ago (2025-02-13)

Exploit prediction

0.60% chance of exploitation in the next 30 days, higher than 48% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

fluidattacks.com https://fluidattacks.com/advisories/relsb/ referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
CISA ADP	3.1	8.2	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N
NVD	3.1	8.2	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N
CNA	3.1	8.2	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N
GitHub	3.1	7.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Affected packages

ecosystem	package	affected	fixed in
npm	markdown-pdf	<=11.0.0	no fix listed

Affected products

n/a markdown-pdf

Classification

Weakness

CWE-79 Improper Neutralization of Input During Web Page Generation

References

fluidattacks.com /advisories/relsb/
exploit, third-party-advisory
npmjs.com /package/markdown-pdf/
product
nvd.nist.gov /vuln/detail/CVE-2023-0835
advisory
fluidattacks.com /advisories/relsb
web
github.com /alanshaw/markdown-pdf
package
npmjs.com /package/markdown-pdf
web

Sources

CVE List CVE-2023-0835
GitHub Advisory GHSA-qghr-877h-f9jh
NVD CVE-2023-0835

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