CVE-2026-66771Network attack vector

Stored XSS via unneutralized content adaptation changes

Published Aug 11, 2026 · Updated Aug 11, 2026

Stored XSS in SAPUI5 SAP_UI 750, 754 through 758, 816, and UI_700 200 allows remote authenticated users to run script in a victim's browser. Content adaptation persists attacker-supplied script in application changes without neutralizing it before rendering the adapted application. Content adaptation privileges and a victim opening the adapted application are required; execution exposes session data and permits actions as the victim.

CVSS severity6.1
Medium
EPSS probability0.22%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in SAPUI5 SAP_UI 750, 754 through 758, 816, and UI_700 200 allows remote authenticated users to run script in a victim's browser. Content adaptation persists attacker-supplied script in application changes without neutralizing it before rendering the adapted application. Content adaptation privileges and a victim opening the adapted application are required; execution exposes session data and permits actions as the victim.

The record

CVE
CVE-2026-66771
Published
Aug 11, 2026
Updated
Aug 11, 2026
Vendor
cap-js
Product
SAPUI5
Classifications
CWE-79, T1203
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 11, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 11, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=754
  2. Affected versionversion=755
  3. Affected versionversion=756
  4. Affected versionversion=757
  5. Affected versionversion=758
  6. Affected versionversion=816
  7. Affected versionversion=SAP_UI 750
  8. Affected versionversion=UI_700 200

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

cap-js · SAPUI5version=754; version=755; version=756; version=757; version=758; version=816; version=SAP_UI 750; version=UI_700 200

Published CVSS scores

6.1SAP SECVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:H/I:H/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1203Exploitation for Client Execution

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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