Stream integrity loss via unvalidated SSE event fields
Published Mar 19, 2026 · Updated Mar 19, 2026
Improper SSE framing in Spring Framework allows remote authenticated users to corrupt plain-text event streams sent to other users. SseEmitter and ServerSentEvent fail to reject invalid characters in id and event fields, so attacker-controlled line breaks are serialized into SSE framing. Exploitation requires MVC or WebFlux, plain-text SSE, attacker control of content streamed to other users, and frontend handling that accepts corrupted state or information.
Summary
What happened
Improper SSE framing in Spring Framework allows remote authenticated users to corrupt plain-text event streams sent to other users. SseEmitter and ServerSentEvent fail to reject invalid characters in id and event fields, so attacker-controlled line breaks are serialized into SSE framing. Exploitation requires MVC or WebFlux, plain-text SSE, attacker control of content streamed to other users, and frontend handling that accepts corrupted state or information.
The record
- CVE
- CVE-2026-22735
- Published
- Mar 19, 2026
- Updated
- Mar 19, 2026
- Vendor
- Spring
- Product
- Spring Framework
- Classifications
- CWE-667, T1565.002
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Mar 19, 2026CVE publishedPublication date reported by the CVE source.
- Mar 19, 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.
- Affected versionversion=5.3.0 <=5.3.46
- Affected versionversion=6.1.0 <=6.1.25
- Affected versionversion=6.2.0 <=6.2.16
- Affected versionversion=7.0.0 <=7.0.5
What conditions does exploitation require?
What is affected?
Published CVSS scores
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.
Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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