CVE-2026-49215Network attack vector

Cross-origin LiveAction invocation via safelisted Accept header

Published Jul 17, 2026 · Updated Jul 17, 2026

CSRF in affected Symfony UX Live Component versions allows remote attackers to invoke LiveActions through forged cross-origin requests. LiveComponentSubscriber::isLiveComponentRequest() treats a CORS-safelisted Accept header as proof of same-origin intent, so fetch() sends state-changing requests without preflight. Exploitation requires a victim session exposed by SameSite=None, credentials: 'include' with a permissive cookie policy, or a same-origin pivot; the action's business logic bounds the resulting state change.

CVSS severity2.1
Low
EPSS probability0.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

CSRF in affected Symfony UX Live Component versions allows remote attackers to invoke LiveActions through forged cross-origin requests. LiveComponentSubscriber::isLiveComponentRequest() treats a CORS-safelisted Accept header as proof of same-origin intent, so fetch() sends state-changing requests without preflight. Exploitation requires a victim session exposed by SameSite=None, credentials: 'include' with a permissive cookie policy, or a same-origin pivot; the action's business logic bounds the resulting state change.

The record

CVE
CVE-2026-49215
Published
Jul 17, 2026
Updated
Jul 17, 2026
Vendor
Symfony
Product
Symfony UX
Classifications
CWE-352
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 17, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 17, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=>= 2.22.0, < 2.36.0
  2. Affected versionversion=>= 3.0.0, < 3.1.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Symfony · Symfony UXversion=>= 2.22.0, < 2.36.0; version=>= 3.0.0, < 3.1.0

Published CVSS scores

5.4NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
2.1GitHub, Inc.CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA: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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-352Cross-Site Request Forgery (CSRF)

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

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo