CVE-2026-47877 Spring Security Authorization Server Default Consent Page is vulnerable to Cross-Site Scripting (XSS)
Attackers can inject malicious scripts into the default consent page, potentially stealing user sessions or executing code in victim browsers.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-47877?
CVE-2026-47877 is a high-severity cross-site scripting vulnerability in Spring Security, published on 27 Aug 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
Spring Security Authorization Server's default consent page renders user-controlled values without HTML entity encoding. Spring Security 7.1.0 Spring Security 7.0.0 - 7.0.6
Weakness: CWE-79
Which versions are affected by CVE-2026-47877?
It affects 1 product.
Products include Vmware Spring Security.
How do I fix CVE-2026-47877?
Upgrade to a fixed version.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-47877 being exploited?
There is no known exploitation of CVE-2026-47877 in the wild and no public exploit code.
Other vulnerabilities in Spring Security
- CVE-2014-3527 Authorization Bypass in Spring Security
- CVE-2026-59354 Spring Security OAuth2 Authorization Server: Insufficient validation of Dynamic Client Registration metadata
- CVE-2026-59270 Spring Security embedded UnboundID LDAP server exposes well-known administrative bind DN on all network interfaces
- CVE-2026-22732 Under Some Conditions Spring Security HTTP Headers Are not Written
- CVE-2023-34034 Access Control Bypass in Spring Security
Sources
Also known as CLEANSTART-2026-ZX09100, GHSA-4pq7-67mc-3rgx.