Adobe Experience Manager: Reflected Cross-Site Scripting (XSS)
Summary
A reflected Cross-Site Scripting vulnerability in Adobe Experience Manager (AEM) Cloud Service allows malicious JavaScript to run in a victim's browser. An attacker needs a low-privileged account and must convince a victim to open a crafted URL that references a vulnerable page. Successful exploitation can affect confidentiality and integrity within the browser context, while availability is not affected. The CVSS base score is 5.4 (Medium).
Affected
- Adobe Experience Manager (AEM) Cloud Service before 2026.10.28871 according to the CVE record
- Adobe bulletin APSB26-189 lists Cloud Service 2026.10.29023 and earlier as affected
- AEM 6.5 and 6.5 LTS: Unknown whether this CVE applies to on-premise versions
Fixed in
- AEM Cloud Service 2026.10.29251 according to Adobe bulletin APSB26-189 (the CVE record names 2026.10.28871; Adobe should confirm)
- AEM 6.5 and 6.5 LTS: Unknown whether this CVE is fixed by the listed cumulative hotfix for GRANITE-75052 or the AEM Forms 6.5 SP25 add-on
Workaround
Unknown.
Exploitation
- Adobe is not aware of any exploits in the wild for the issues in APSB26-189.
- No public proof of concept found.
- Third-party trackers report no known exploitation and no CISA KEV listing for this CVE.
Our recommendation
- Confirm that the AEM Cloud Service build is at least 2026.10.29251 and that automatic updates have completed.
- For AEM 6.5 or 6.5 LTS, apply the hotfixes or add-ons listed in APSB26-189 and confirm with Adobe whether they cover this CVE.
- Review whether author and login areas are exposed to the internet and restrict access where possible.
- Prioritise the other Critical issues in APSB26-189 (for example CVE-2026-114371, CVE-2026-113580 and CVE-2026-113579) over this Medium issue.
Public exploits
PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.
Research sources
- Adobe Security Bulletin APSB26-189 www.adobe.com
- CVE Record CVE-2026-123341 www.cve.org
- AEM Cloud Service maintenance release notes experienceleague.adobe.com
- AEM release updates roadmap experienceleague.adobe.com
- ZDI November 2026 security update review www.thezdi.com
- OffSeq radar entry for CVE-2026-123341 radar.offseq.com
Researched and written up in English and German by an AI (Claude by Anthropic) based on NVD, CISA, EPSS and the sources listed. The vendor information is authoritative. Researched on 11 Nov 2026, 17:16.
Original description (NVD)
Adobe Experience Manager is affected by a reflected Cross-Site Scripting (XSS) vulnerability. If a low-privileged attacker is able to convince a victim to visit a URL referencing a vulnerable page, malicious JavaScript content may be executed within the context of the victim's browser. Scope is changed.
Sources
The tracker combines official, freely usable data sources – updated continuously:
- NVD (NIST) – CVEs, rating (CVSS), affected products
- CISA KEV – vulnerabilities confirmed by CISA as actively exploited
- CISA Vulnrichment – CISA assessment (SSVC) in the official CVE record
- FIRST EPSS – probability of exploitation
- Microsoft MSRC – Patch Tuesday: vulnerabilities, severity, updates
- PoC-in-GitHub – public proof-of-concept repositories
- Metasploit (Rapid7) – modules of the Metasploit Framework
- Exploit-DB (OffSec) – archive of public exploits (links only)
- Patch days: official vendor pages (linked per vendor) (Vendor patch days)
This product uses data from the NVD API but is not endorsed or certified by the NVD. EPSS data © FIRST.org.
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