CVE-2026-49216 json
Symfony UX: XSS in symfony/ux-autocomplete via unescaped AJAX response data
published 4mo ago modified 18d ago also GHSA-mwqm-4fw3-cjvr , EUVD-2026-45216
- cvss
- 5.4
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.3%
- EPSS 0.3% chance of exploitation in 30 days, percentile 24%
- public exploits
- 0
- none known
Summary
Symfony UX is a JavaScript ecosystem for Symfony. From 2.2.0 until 2.36.0 and 3.1.0, the Stimulus controller in symfony/ux-autocomplete renders AJAX response items in _createAutocompleteWithRemoteData() by interpolating the text field into HTML template literals (<div>${item[labelField]}</div>) rather than text, allowing attacker-controlled markup from user-supplied dropdown values to execute in the browser of any user who opens an autocomplete widget backed by the same data. This issue is fixed in versions 2.36.0 and 3.1.0.
Patch / fix
- packagist symfony/ux-autocomplete 2.36.0, 3.1.0
- symfony ux 2.36.0
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Check with FencerCISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 3mo ago
Exploit prediction
0.31% chance of exploitation in the next 30 days, higher than 24% of all scored CVEs (FIRST EPSS, 2026-11-11).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 4.0 | 5.1 | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N |
| CNA | 4.0 | 5.1 | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X |
| NVD | 3.1 | 5.4 | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| packagist | symfony/ux-autocomplete | >=2.2.0, <2.36.0 >=3.0.0, <3.1.0 |
2.36.0 3.1.0 |
Affected products
- symfony ux
Classification
- Weakness
-
- CWE-79 Improper Neutralization of Input During Web Page Generation
References
-
github.com
/symfony/ux/commit/842ae54bc74de389299f975f01aafae272cb0019
web, patch
-
github.com
/symfony/ux/security/advisories/GHSA-mwqm-4fw3-cjvr
web, vendor-advisory
-
github.com
/symfony/ux/releases/tag/v2.36.0
release-notes
-
github.com
/symfony/ux/releases/tag/v3.1.0
release-notes
-
github.com
/FriendsOfPHP/security-advisories/blob/master/symfony/ux-autocomplete/CVE-2026-49216.yaml
web
-
github.com
/symfony/ux
package
Sources
- CVE List CVE-2026-49216
- GitHub Advisory GHSA-mwqm-4fw3-cjvr
- NVD CVE-2026-49216
Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.