priyankark a11y-mcp index.js A11yServer server-side request forgery

published 2026-04-02 7 mo ago modified 2026-10-26 13 d ago also GHSA-prmx-7v35-7q82 , EUVD-2026-18130

cvss: 5.3; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.1%; EPSS 0.1% chance of exploitation in 30 days, percentile 2%
public exploits: 0; none known

A vulnerability was found in priyankark a11y-mcp up to 1.0.5. This vulnerability affects the function A11yServer of the file src/index.js. The manipulation results in server-side request forgery. The attack must be initiated from a local position. The exploit has been made public and could be used. This product operates on a rolling release basis, ensuring continuous delivery. Consequently, there are no version details for either affected or updated releases. Upgrading to version 1.0.6 is able to resolve this issue. The patch is identified as e3e11c9e8482bd06b82fd9fced67be4856f0dffc. It is recommended to upgrade the affected component. The vendor acknowledged the issue but provides additional context for the CVSS rating: "a11y-mcp is a local stdio MCP server - it has no HTTP endpoint and is not network-accessible. The caller is always the local user or an LLM acting on their behalf with user approval."

Patch / fix

fixed in 2 links 1

npm a11y-mcp 1.0.5
priyankark a11y-mcp 1.0.6

github.com/priyankark/a11y-mcp@e3e11c9 commit

CISA SSVC

Exploitation: Proof of concept is public
Automatable: no
Technical impact: partial
Assessed: 7 mo ago (2026-04-03)

Exploit prediction

0.13% chance of exploitation in the next 30 days, higher than 2% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

github.com https://github.com/wing3e/public_exp/issues/17 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
CNA	4.0	4.8	CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P
CNA	3.1	5.3	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L/E:P/RL:O/RC:C
CNA	3.0	5.3	CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L/E:P/RL:O/RC:C
CNA	2.0	4.3	AV:L/AC:L/Au:S/C:P/I:P/A:P/E:POC/RL:OF/RC:C
CNA	4.0	1.9	CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CNA	3.1	5.3	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
CNA	2.0	4.3	AV:L/AC:L/Au:S/C:P/I:P/A:P
GitHub	3.1	5.3	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L

Affected packages

ecosystem	package	affected	fixed in
npm	a11y-mcp	<1.0.5	1.0.5

Affected products

priyankark a11y-mcp

Classification

Weakness

CWE-918 Server-Side Request Forgery

References

github.com /priyankark/a11y-mcp/commit/e3e11c9e8482bd06b82fd9fced67be4856f0dffc
patch, web
github.com /wing3e/public_exp/issues/17
exploit, issue-tracking, web
vuldb.com /vuln/354655
vdb-entry, technical-description, web
vuldb.com /vuln/354655/cti
signature, permissions-required, web
vuldb.com /submit/780752
third-party-advisory, web
github.com /priyankark/a11y-mcp/
product
nvd.nist.gov /vuln/detail/CVE-2026-5323
advisory
github.com /priyankark/a11y-mcp
package

Sources

CVE List CVE-2026-5323
GitHub Advisory GHSA-prmx-7v35-7q82
NVD CVE-2026-5323

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