HOMEVULNERABILITIESCVE-2026-49215
MEDIUM

CVE-2026-49215

CWE-352Published: July 17, 2026· Updated: Jul 20, 2026

5.4
CVSS v3.1
EPSS:0.18%probability of exploitation in 30 daysPercentile:7.5th

Official Description

Symfony UX is a JavaScript ecosystem for Symfony. From 2.22.0 until 2.36.0 and 3.1.0, Symfony\UX\LiveComponent\EventListener\LiveComponentSubscriber::isLiveComponentRequest() gates #[LiveAction] invocations on Accept: application/vnd.live-component+html, but the Accept header is CORS-safelisted and cross-origin fetch() can set it without preflight, allowing forged cross-origin #[LiveAction] requests against a victim session when applications use SameSite=None, credentials: 'include', a permissive cookie policy, or a same-origin pivot. This issue is fixed in versions 2.36.0 and 3.1.0.

NVD Source

Technical Analysis

CVE-2026-49215 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation does not require any privileges, though user interaction (Required) is needed, which slightly reduces the risk of mass automated attacks.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionRequired
ScopeUnchanged
Impact
ConfidentialityLow
IntegrityLow
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N

Affected Vendors & Products

symfony1 product(s)
ux
Source: NVD CPE · 2 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

PATCHhttps://github.com/symfony/ux/commit/aed7493db2b4b7bf1f9c79b33cda544f06904b27
ADVISORYhttps://github.com/symfony/ux/security/advisories/GHSA-4m4j-hmqq-3gxm

All References (4)

→
https://github.com/symfony/ux/commit/aed7493db2b4b7bf1f9c79b33cda544f06904b27Patch
→
https://github.com/symfony/ux/releases/tag/v2.36.0Release Notes
→
https://github.com/symfony/ux/releases/tag/v3.1.0Release Notes
→
https://github.com/symfony/ux/security/advisories/GHSA-4m4j-hmqq-3gxmVendor Advisory

Quick Facts

CVE IDCVE-2026-49215
CVSS Score5.4 / 10
SeverityMEDIUM
WeaknessCWE-352
CISA KEVNo
EPSS (30d)0.18%
Affected1 vendor(s)
PublishedJul 17, 2026

Related CVEs (CWE-352)

CVE-2017-5145
10.0
CVE-2025-23922
10.0
CVE-2025-32642
10.0
CVE-2024-33449
9.8
CVE-2019-14551
9.8
CVE-2017-16780
9.8

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2026-49215 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWatch. CVE data is provided under the NVD usage policy.
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