Adobe Experience Manager: Stored Cross-Site Scripting in form fields
Summary
Adobe Experience Manager (AEM) contains a stored Cross-Site Scripting (XSS) vulnerability in form fields. An attacker with a low-privileged account can store malicious JavaScript in a vulnerable field. The script runs in a victim's browser when the victim opens the page containing that field, which requires user interaction. The impact is limited to low confidentiality and integrity, with no availability impact. The CVSS score is 5.4 (medium) and the scope is changed.
Affected
- AEM as a Cloud Service: 0 to 2026.10.29023 according to the CVE record
- AEM 6.5: 0 to 6.5.25 according to the CVE record
- AEM 6.5 LTS: 0 to 6.5 LTS SP3 according to the CVE record
- Note: the APSB26-189 bulletin text I could retrieve marks AEM 6.5 and 6.5 LTS as not affected. This conflicts with the CVE record and is unresolved.
Fixed in
- AEM as a Cloud Service: 2026.10.29251 according to the CVE record and the bulletin
- AEM 6.5 and 6.5 LTS: the CVE record names a cumulative hotfix for GRANITE-75398. The bulletin text I could retrieve names GRANITE-75052 instead. Unresolved; confirm the hotfix ID with Adobe.
- AEM 6.5 with Forms add-on: AEM Forms 6.5 SP25 add-on according to the bulletin
Workaround
- No vendor workaround documented. Status: unknown.
- Apply the vendor patch.
Exploitation
- Adobe states it is not aware of any exploits in the wild for the issues in APSB26-189.
- Not listed in CISA KEV. EPSS is 0.00371 (below 1%).
- No public proof-of-concept found. This is a negative result from limited searching.
Our recommendation
- Check whether you run any AEM deployment at all. Most SMEs do not.
- If you run AEM, confirm your product and version against the APSB26-189 product table, including the correct GRANITE hotfix ID for on-premise 6.5 and LTS.
- Apply the fix in your normal patch cycle with the rest of APSB26-189, or confirm the Cloud Service release with your provider.
- Review public-facing forms for input validation and output encoding, and consider a Content Security Policy as defence in depth.
- Priority: moderate.
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-2026-118478 www.cve.org
- OpenCVE CVE-2026-118478 app.opencve.io
- Radar OffSeq CVE-2026-118478 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, 17:22.
Original description (NVD)
Adobe Experience Manager is affected by a stored Cross-Site Scripting (XSS) vulnerability that could be abused by a low-privileged attacker to inject malicious scripts into vulnerable form fields. Malicious JavaScript may be executed in a victim's browser when they browse to the page containing the vulnerable field. 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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