---
id: "CVE-2026-121887"
page: "https://infrastack.ai/live/CVE-2026-121887"
kind: "vulnerability"
aliases: ["CVE-2026-121887"]
title: "Adobe Connect: XML external entity flaw allows code execution by low-privileged users"
severity: "critical"
cvss: 9.9
epss: null
exploited: false
status: "open"
category: "other"
products: [{"name": "Adobe Connect", "fixed": ["12.12.a", "12.11.i", "12.10.f", "12.9.a", "12.8.a"], "affected": "<= 12.12 (Windows), before patch builds 12.12.a / 12.11.i / 12.10.f / 12.9.a / 12.8.a", "ecosystem": "vendor"}]
ecosystems: []
tags: ["adobe-connect", "other", "self-hosted", "windows", "xxe"]
not_affected_if: ["managed-hosting"]
published_at: "2026-11-10T22:18:26+00:00"
first_seen_at: "2026-11-10T22:27:27+00:00"
updated_at: "2026-11-10T22:33:43+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-121887", "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": "2026-11-10T22:33:43+00:00", "cites": ["https://www.adobe.com/trust/security/products/connect/apsb26-191.html"]}]
exploit_sources: []
---

# Adobe Connect: XML external entity flaw allows code execution by low-privileged users

Link for people: https://infrastack.ai/live/CVE-2026-121887 (this .md is for agents)

Adobe Connect improperly restricts XML external entity references, a classic XXE flaw. A low-privileged attacker can execute arbitrary code in the context of the current user without any user interaction.

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

## Affected

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

## How to check

Check your on-premise Adobe Connect Windows server version in Connect Central/admin. Affected is 12.12 and earlier without the patch build for its branch (12.12.a, 12.11.i, 12.10.f, 12.9.a, 12.8.a). Adobe's bulletin lists Windows only; macOS is not listed.

## Fix

Apply the Adobe Connect patch build for your branch: 12.12.a, 12.11.i, 12.10.f, 12.9.a or 12.8.a (APSB26-191, priority 2).

## Timeline

- 2026-11-10T22:27:27+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-121887
- 2026-11-10T22:33:43+00:00 analyst https://www.adobe.com/trust/security/products/connect/apsb26-191.html — Read Adobe APSB26-191 (Nov 10 2026): CVE listed, XXE CWE-611, CVSS 9.9 PR:L, Windows only, no known exploitation. Fix = per-branch patch builds.

## Documents

- [advisory] APSB26-191 Security update available for Adobe Connect https://www.adobe.com/trust/security/products/connect/apsb26-191.html

## From the sources

Adobe Connect is affected by an Improper Restriction of XML External Entity Reference ('XXE') vulnerability that could result in arbitrary code execution in the context of the current user. A low-privileged attacker could exploit this vulnerability to execute arbitrary code. 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_