---
id: "CVE-2026-121890"
page: "https://infrastack.ai/live/CVE-2026-121890"
kind: "vulnerability"
aliases: ["CVE-2026-121890"]
title: "Adobe Connect: XML external entity flaw lets low-privileged users read server files"
severity: "high"
cvss: 7.7
epss: null
exploited: false
status: "open"
category: "vendor"
products: [{"name": "Adobe Connect", "fixed": ["12.12.a", "12.11.i", "12.10.f", "12.9.a", "12.8.a"], "affected": "<= 12.12 (Windows)", "ecosystem": "vendor"}]
ecosystems: []
tags: ["adobe-connect", "auth-required", "self-hosted", "vendor", "windows", "xxe"]
not_affected_if: ["auth-required", "unknown"]
published_at: "2026-11-10T22:18:26+00:00"
first_seen_at: "2026-11-10T22:27:27+00:00"
updated_at: "2026-11-10T22:39:31+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-121890", "first_seen_at": "2026-11-10T22:27:27+00:00"}, {"source": "analyst", "url": "https://www.adobe.com/trust/security/products/connect/apsb26-191.html", "first_seen_at": "2026-11-10T22:39:31+00:00", "cites": ["https://www.adobe.com/trust/security/products/connect/apsb26-191.html", "https://helpx.adobe.com/adobe-connect/kb/connect-on-prem-patches.html"]}]
exploit_sources: []
---

# Adobe Connect: XML external entity flaw lets low-privileged users read server files

Link for people: https://infrastack.ai/live/CVE-2026-121890 (this .md is for agents)

Adobe Connect on Windows (12.12 and earlier) has an XML external entity flaw (CWE-611, CVSS 7.7). A logged-in low-privileged user can read files and directories outside the intended scope. No user interaction is needed. Adobe fixed it in APSB26-191 on 2026-11-10 (priority 2) and is not aware of exploitation.

_Summary, check and fix written by a model from the sources; labelled as such._

## Affected

- vendor:Adobe Connect affected <= 12.12 (Windows) fixed 12.12.a, 12.11.i, 12.10.f, 12.9.a, 12.8.a

## How to check

Find your Adobe Connect server version (Windows). Per APSB26-191, 12.12 and earlier are affected. You are fixed only on the patched build for your branch: 12.12.a, 12.11.i, 12.10.f, 12.9.a or 12.8.a. Adobe lists Windows only. It does not say whether the hosted service is affected.

## Fix

Install the Adobe Connect patch for your branch (APSB26-191): 12.12.a, 12.11.i, 12.10.f, 12.9.a or 12.8.a. On-prem patch files are on Adobe's Connect on-premise patches page.

## Timeline

- 2026-11-10T22:27:27+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-121890
- 2026-11-10T22:39:31+00:00 analyst https://www.adobe.com/trust/security/products/connect/apsb26-191.html — APSB26-191 (Nov 10 2026) read: affected 12.12 and earlier on Windows, fixed builds per branch, no known exploitation, PoC not seen. Hosted vs on-prem not stated in the bulletin. who_affected and how_to_check left unverified. No check written: the version is not readable from a repo.

## Documents

- [advisory] APSB26-191 Security update available for Adobe Connect https://www.adobe.com/trust/security/products/connect/apsb26-191.html
- [fix] Find on-premise patch files for Adobe Connect 9-12 https://helpx.adobe.com/adobe-connect/kb/connect-on-prem-patches.html

## From the sources

Adobe Connect is affected by an Improper Restriction of XML External Entity Reference ('XXE') vulnerability that could lead to arbitrary file system read. A low-privileged attacker could exploit this vulnerability to access sensitive files and directories outside the intended access scope. Exploitation of this issue does not require user interaction. Scope is changed.

---

_Free to read, with fair use of about 60 pages a minute. For higher limits or API access: sales@infrastack.ai_